New Build Developments: When Should Groundworks Begin?

Groundworks on a new build development should begin once the necessary planning requirements, site investigations, engineering designs, access arrangements and construction preparations are sufficiently complete to allow work to proceed safely and in accordance with the approved plans.
Groundworks are among the earliest physical stages of a construction project. They prepare the land for the structures and infrastructure that follow, including foundations, drainage systems, underground services, access roads and external areas.
Starting too early can create problems if important information is missing, planning conditions remain unresolved or the ground conditions differ from expectations. Starting too late can delay the wider construction programme and affect the availability of contractors, plant and materials.
For developers, the objective is to identify the information and approvals needed before mobilisation, then schedule the groundwork activities in the correct sequence.
Batten Civil Engineering Ltd provides groundwork and civil engineering services that support construction projects involving site preparation, drainage, road and car park construction, kerbing and related infrastructure.
This guide explains when groundworks should begin, what needs to happen beforehand, how the work is usually sequenced and what developers should consider when planning a new build project.

What Are Groundworks in a New Build Development?

Groundworks are the construction activities required to prepare a site and create the foundations and infrastructure needed for a development.
The exact scope depends on the project, but groundworks may include:

• Site clearance and preparation
• Removal of unsuitable ground material
• Excavation and earthworks
• Formation of building foundations
• Sub base preparation
• Below ground drainage installation
• Underground utility ducting and service routes
• Road and access construction
• Kerbing and external hardstanding
• Ground preparation for floor slabs
• Surface water management
  On a residential development, groundworks may cover individual house plots, shared access roads, drainage networks, footpaths and communal areas.
  On a commercial development, the work may include building foundations, service yards, access roads, parking areas, loading areas and supporting infrastructure.
  Groundworks are not simply the first task on a construction site. They establish the physical conditions that allow the rest of the project to proceed.

When Should Groundworks Begin on a New Build Development?

Groundworks should generally begin after the essential planning, design, site investigation and construction preparation requirements have been addressed.
There is no single date that applies to every new build development.
A small project on a straightforward site may be ready to begin relatively quickly once the necessary information and permissions are in place.
A larger housing development or commercial scheme may require extensive surveys, engineering design, drainage planning, access arrangements and coordination with utility providers before excavation can start.
As a practical guide, groundworks should begin when:

1. The necessary planning permission and relevant pre commencement requirements have been addressed.
2. The site has been investigated sufficiently to inform the design.
3. Foundation and infrastructure designs are available for construction.
4. Drainage and utility arrangements have been coordinated.
5. Site access, temporary facilities and health and safety arrangements are ready.
6. The contractor has an agreed scope, programme and construction information.
7. Any required inspections or approvals before particular activities have been arranged.
   These conditions help reduce the risk of work having to stop because essential information is missing.

1. Confirm Planning Permission and Relevant Conditions

Planning permission is one of the first matters developers should review before arranging groundworks.
However, obtaining planning permission does not necessarily mean that every aspect of a development is ready for construction.
Some permissions include conditions that must be discharged before particular work begins.
These may relate to matters such as:

• Site access
• Landscaping
• Drainage
• Contamination
• Construction management
• Ecological protection
• Materials and external design
  The specific requirements depend on the planning decision and the development.
  Developers should review the planning permission carefully and identify which conditions apply before starting work.
  Planning requirements differ across the UK, so developers should confirm the applicable process with the relevant local planning authority.
  Important: Do not assume that planning permission alone authorises every proposed activity on the site. Any conditions and other legal requirements that apply to the intended work must be checked before construction begins.

2. Complete the Necessary Site Investigations

Site investigations help developers understand the physical conditions beneath and around the proposed development.
This information is important because ground conditions influence foundation design, excavation methods, drainage arrangements and construction costs.
Depending on the site, investigations may include:

• Ground investigation and soil testing
• Assessment of bearing conditions
• Groundwater assessment
• Contamination investigations
• Existing drainage surveys
• Topographical surveys
• Identification of buried obstructions
• Assessment of existing structures
  A site with stable ground and straightforward access may require a different approach from a site with made ground, high groundwater levels, contamination or significant changes in elevation.
  If ground investigations are incomplete, the contractor may encounter unexpected conditions after excavation begins.
  This can lead to changes in the foundation design, additional excavation, disposal requirements or delays while further engineering decisions are made.
  For this reason, developers should arrange the relevant investigations early enough for the results to inform the construction design and tendering process.

3. Finalise Foundation and Engineering Designs

Foundation design should be based on the building requirements and relevant ground information.
Different sites may require different foundation solutions.
Depending on the design, foundations could include:

• Strip foundations
• Trench fill foundations
• Pad foundations
• Raft foundations
• Piled foundations
• Other engineered foundation systems
  The appropriate solution depends on factors such as soil conditions, building loads, groundwater, nearby structures and the structural design.
  Before groundworks begin, the contractor should have the relevant construction drawings and specifications needed for the planned activities.
  These may include foundation layouts, excavation depths, structural details, setting out information and formation requirements.
  If foundation designs are still being developed, starting excavation prematurely can result in rework or delays.
  Developers should therefore coordinate the groundworks programme with the architect, structural engineer, groundworks contractor and other relevant project professionals.

4. Resolve Drainage Requirements Before Excavation

Drainage is one of the most important elements to coordinate before groundworks begin.
A new development may require foul water drainage, surface water drainage or both.
The design should consider how wastewater and rainwater will be managed and where the systems will connect or discharge.
Depending on the project, drainage arrangements may involve:

• Connections to existing public sewer networks
• New private drainage systems
• Surface water drainage networks
• Soakaways or other approved infiltration systems
• Sustainable drainage systems
• Drainage channels and gullies
• Inspection chambers and manholes
• Connections to existing infrastructure
  Drainage decisions can affect excavation levels, foundation locations, road construction and finished ground levels.
  If drainage routes are not coordinated with the foundation design, services may conflict with foundations or require expensive alterations.
  Developers should confirm the drainage strategy and identify any approvals or connection arrangements needed before the relevant work begins.
  Batten’s groundwork and civil engineering services include drainage and related infrastructure work that can form part of a wider development project.

5. Arrange Utility and Service Coordination

New build developments often require several underground services.
These may include:

• Water supply
• Electricity
• Gas, where applicable
• Telecommunications
• Foul drainage
• Surface water drainage
  The exact requirements depend on the development and its location.
  Before excavation begins, developers should identify existing underground services and coordinate proposed service routes with the relevant utility providers and design team.
  This helps reduce the risk of damaging existing infrastructure or installing new services in unsuitable locations.
  Utility coordination should also consider the sequence of construction.
  For example, underground services may need to be installed before certain areas are covered by concrete slabs, roads or finished landscaping.
  Where utility connections depend on external providers, developers should account for their lead times within the project programme.

6. Prepare Site Access and Temporary Facilities

Groundworks require suitable access for workers, machinery, materials and waste removal.
Before mobilisation, developers should consider whether the site can accommodate:

• Excavators and other plant
• Delivery vehicles
• Concrete wagons
• Aggregate deliveries
• Waste removal vehicles
• Temporary storage areas
• Site welfare facilities
• Safe pedestrian access
  If the existing access is unsuitable, temporary access improvements may be needed before major excavation starts.
  The location of storage areas, welfare facilities and temporary routes should also be planned so they do not interfere with the work.
  On constrained sites, access arrangements can have a significant effect on the order in which groundworks are completed.
  Developers should therefore review site logistics before the contractor arrives.

7. Establish the Construction Programme

A construction programme identifies the order in which activities will take place and how they depend on one another.
Groundworks should be scheduled in coordination with the wider development programme.
A typical sequence may involve:

1. Pre construction checks and site mobilisation
2. Site clearance and preparation
3. Setting out and excavation
4. Foundation construction
5. Below ground drainage and services
6. Substructure and floor preparation
7. Access roads and external infrastructure
8. Handover to the next construction stage
   The exact sequence can vary.
   For example, drainage installation may need to take place alongside foundation work, while road construction may be phased to maintain access for other trades.
   A well planned programme helps avoid situations where completed work must be excavated again because another activity was not coordinated.

What Is the Typical Groundworks Sequence for a New Build?

Although every development is different, groundworks generally follow a logical sequence from site preparation through to foundations and supporting infrastructure.

Stage 1: Site Clearance

The site is prepared for construction.
This may involve removing vegetation, clearing debris, removing unsuitable surface materials and identifying obstructions.
Topsoil may be stripped and stored for later landscaping where appropriate.
Before clearance begins, developers should check whether ecological restrictions, protected trees or other site requirements affect the work.

Stage 2: Setting Out

The building positions, site boundaries and relevant levels are established using the approved drawings and survey information.
Accurate setting out helps ensure that foundations, drainage routes and access infrastructure are constructed in the correct locations.
Errors at this stage can affect later construction activities.

Stage 3: Excavation and Earthworks

Excavation is carried out to the required levels and dimensions.
Depending on the project, this may involve:

• Bulk excavation
• Foundation trench excavation
• Localised excavation for drainage
• Removal of unsuitable material
• Ground level adjustments
  The excavated ground should be assessed against the relevant design requirements before the next stage proceeds.

Stage 4: Foundation Construction

Foundations are installed in accordance with the approved engineering design.
The work may include excavation inspection, preparation of the foundation formation, reinforcement where specified and concrete placement.
The exact process depends on the foundation type and site conditions.

Stage 5: Below Ground Drainage and Services

Drainage systems and underground service routes are installed in the locations shown on the relevant drawings.
This stage may involve pipes, inspection chambers, service ducts and connections.
The timing should be coordinated with foundations and floor construction to reduce the risk of later excavation.

Stage 6: Substructure and Floor Preparation

Once the relevant below ground work is complete, the substructure and floor preparation can proceed.
Depending on the design, this may include foundation blockwork, damp proofing, sub base material, insulation, membranes and floor slab preparation.
Required inspections and checks should be completed before the work is covered.

Stage 7: Access Roads and External Infrastructure

Roads, parking areas, kerbing, drainage features and other external infrastructure may be completed in phases.
The timing depends on access requirements, heavy vehicle movements and the needs of the wider construction programme.
Batten provides commercial roads and car park surfacing for projects where access roads, parking areas and related surfacing form part of the development.

Should Groundworks Begin Before the Building Design Is Fully Finalised?

Groundworks should not proceed on the assumption that unfinished design information can be resolved later without consequences.
Some early activities may be possible while other elements of the design are still being completed, provided the work has the necessary information and approvals and does not create conflicts with later construction.
For example, certain site clearance or enabling works may be able to proceed before every building detail has been finalised.
However, foundation excavation, drainage installation and other permanent works require sufficiently developed information for the specific activity.
Developers should distinguish between:
Enabling works: Activities that prepare the site for construction, subject to relevant permissions and requirements.
Permanent groundworks: Activities that form part of the final construction, such as foundations and permanent drainage.
The contractor should confirm which activities can safely and properly proceed and which depend on further design information.

What Happens If Groundworks Start Too Early?

Starting groundworks before the necessary information is ready can create several problems.

1. Design Changes After Excavation

If foundation or drainage designs change after excavation begins, completed work may need to be altered.
This can increase costs and delay subsequent activities.

2. Unexpected Ground Conditions

If investigations are incomplete, the contractor may discover weak ground, groundwater or buried obstructions that were not anticipated.
Additional investigation or design changes may then be required.

3. Drainage and Service Conflicts

If underground services are not coordinated with foundations and finished levels, pipes and ducts may need to be moved.
This can result in additional excavation and reinstatement work.

4. Planning or Compliance Problems

Starting work before relevant planning conditions or other applicable requirements have been addressed can create regulatory and programme risks.
Developers should confirm the requirements that apply to the intended work before mobilisation.

5. Increased Costs

Rework, additional excavation, material changes and delays can increase the overall cost of a development.
The best way to reduce these risks is to resolve key information before committing to the affected construction activities.

What Happens If Groundworks Start Too Late?

Groundworks that begin later than planned can also affect the development.
Potential consequences include:

• Delayed foundation completion
• Delayed delivery of materials
• Disruption to following trades
• Changes to plant and labour availability
• Longer site establishment periods
• Delayed access road construction
• Delayed completion of drainage and services
• Changes to the overall project completion date
  These issues can be particularly significant on multi plot developments, where several construction activities depend on the completion of shared infrastructure.
  Early coordination helps developers identify when the site will genuinely be ready and book the necessary resources accordingly.

How Long Does Groundwork Preparation Take Before Construction Begins?

There is no fixed preparation period for every development.
The time required depends on the size of the site, ground conditions, planning requirements, engineering complexity and availability of information.
A straightforward project may require relatively limited preparation.
A larger development may need extensive site investigations, drainage design, utility coordination and engineering work before construction can begin.
The physical groundworks phase also varies according to the amount of excavation, foundation construction, drainage installation and infrastructure required.
Developers should therefore separate two questions:

1. How long will it take to prepare the project for groundworks?
2. How long will the groundworks themselves take?
   These are different parts of the programme and should be estimated separately.
   A realistic programme should include time for surveys, design coordination, approvals, mobilisation, construction and any required inspections.

What Factors Affect the Start Date for Groundworks?

Several factors can influence when a new build development is ready to begin.

Planning Requirements

Planning conditions and other relevant permissions may need to be addressed before specific work can start.

Ground Conditions

Weak ground, contamination, groundwater and unexpected obstructions can affect the design and preparation period.

Drainage Design

Drainage arrangements may require coordination with external infrastructure providers or relevant authorities.

Utility Connections

Utility providers may have their own application, design and connection processes.

Access

Restricted access can affect plant movements, deliveries and the order of work.

Weather

Heavy rainfall and unsuitable ground conditions can affect excavation, earthworks and material handling.

Design Coordination

Changes to foundation, drainage or infrastructure designs can delay construction readiness.

Contractor Availability

The availability of suitable labour, machinery and materials can influence the mobilisation date.
Considering these factors early helps developers build a more realistic construction programme.

Why Drainage and Groundworks Must Be Coordinated

Drainage is closely connected to the rest of the groundworks package.
Foundation depths, drainage gradients, finished ground levels and road construction can all influence one another.
If drainage is installed without considering the wider development layout, the system may conflict with other infrastructure.
Similarly, if external levels are finalised without considering drainage, water may collect in unsuitable areas or flow towards buildings.
Drainage coordination should therefore consider:

• Proposed building positions
• Foundation locations
• Existing drainage infrastructure
• Finished floor levels
• Road and parking levels
• Surface water management
• Underground service routes
• Maintenance access
  Batten’s article on groundworks, drainage and external works for residential projects discusses how these elements support the long term performance of a development.

When Should Access Roads and Car Parks Be Constructed?

Access roads and car parks can be built at different stages depending on the development.
Temporary access may be required early to allow construction vehicles to reach the site.
Permanent roads and parking areas may be completed later, once heavy construction traffic has reduced or the relevant sections are ready.
The correct sequence depends on:

• Site access requirements
• Construction traffic
• Drainage installation
• Underground services
• Kerbing and levels
• Surface material requirements
• The need to protect completed areas
  For some developments, access roads may need to be completed in phases so that different plots remain accessible.
  For others, permanent surfacing may be delayed until the main construction activity is complete.
  The contractor should coordinate the road and car park programme with the wider construction schedule.

How Can Developers Reduce Groundworks Delays?

Good preparation can help reduce avoidable delays.

Complete Site Investigations Early

Arrange relevant surveys and investigations before finalising the construction approach.

Coordinate Design Information

Ensure the contractor has the drawings and specifications required for the activities being undertaken.

Confirm Drainage and Utility Arrangements

Resolve service routes and connection requirements before they become obstacles during excavation.

Plan Site Access

Make sure plant, deliveries and waste removal can be accommodated safely.

Agree the Scope of Work

Clarify which activities are included in the groundworks package and which are the responsibility of other contractors.

Schedule Inspections

Identify the inspections and approvals required at relevant stages.

Maintain Clear Communication

Keep the developer, design team, groundworks contractor and other trades informed about changes that may affect the programme.
These steps help reduce the risk of work stopping because an important decision has not been made.

What Should Developers Ask a Groundworks Contractor Before Starting?

Before appointing a contractor or agreeing a start date, developers should ask:

1. Has the site been assessed sufficiently to plan the proposed work?
2. Are the foundation and drainage drawings available?
3. What site clearance and excavation work is required?
4. Are there any known ground condition risks?
5. How will underground services be identified and coordinated?
6. What access arrangements are needed?
7. Which inspections or approvals must be arranged?
8. What is included in the groundworks package?
9. Which activities depend on other contractors?
10. What could delay the planned start date?
11. How will unexpected ground conditions be managed?
12. What information is required before the contractor can mobilise?
    These questions help establish whether the project is ready for construction and clarify responsibilities before work begins.

Groundworks for Residential and Commercial Developments

The exact requirements differ between residential and commercial projects.

Residential Developments

Residential groundworks may include:

• Individual house plot preparation
• Foundations
• Drainage networks
• Utility routes
• Estate roads
• Footpaths
• Kerbing
• Driveways
• Landscaping preparation
  On larger housing developments, the sequence of shared infrastructure and individual plots needs careful coordination.

Commercial Developments

Commercial groundworks may include:

• Building foundations
• Industrial access roads
• Car parks
• Service yards
• Drainage systems
• Kerbing
• Underground services
• Hardstanding
• External infrastructure
  Commercial sites may also need to accommodate heavier vehicles and larger delivery movements.
  Batten Civil Engineering supports development projects through its groundwork and civil engineering services, including road and car park construction, drainage, kerbing and site clearance.

A Practical Example: Planning Groundworks for a New Housing Development

Consider a developer preparing a small housing development on a previously undeveloped site.
The initial programme identifies that foundation excavation should begin in several weeks.
Before mobilisation, the project team reviews the planning requirements, site investigation results, foundation drawings and drainage layout.
The review identifies that a drainage connection still needs to be confirmed and that the access route requires preparation for construction vehicles.
Rather than starting foundation excavation immediately, the developer coordinates the outstanding drainage information and arranges the access work.
Once the relevant requirements are addressed, the groundworks contractor can begin the planned activities with a clearer understanding of the site.
This approach helps reduce the risk of excavation being interrupted by unresolved infrastructure issues.

Frequently Asked Questions

When should groundworks begin on a new build?

Groundworks should begin once the relevant planning requirements, site investigations, construction designs, drainage arrangements and access preparations are sufficiently complete for the work to proceed.

Can groundworks start before planning permission is granted?

Developers should not assume that groundworks can begin before planning permission is granted. Certain activities may have different legal requirements, but the rules depend on the location and nature of the work. The relevant planning authority should be consulted before work starts.

Do site investigations need to be completed before groundworks?

Relevant investigations should be completed early enough to inform the design and construction method. The extent of investigation depends on the site and the proposed work.

What is the first stage of groundworks?

The first physical stage is often site establishment and clearance, followed by setting out, excavation and foundation preparation. The exact sequence depends on the project and any enabling works required.

How long do groundworks take on a new build?

The duration depends on site size, ground conditions, foundation design, drainage, infrastructure requirements and construction sequencing. A contractor should provide a project specific programme.

Should drainage be installed before foundations?

The sequence depends on the design and site conditions. Drainage routes must be coordinated with foundations, and some drainage work may take place alongside or after foundation construction.

Can a groundworks contractor start before all utility connections are available?

Some activities may be able to proceed before every utility connection is complete, provided the work has the necessary information and does not conflict with future services. The programme should account for utility routes and connection requirements.

What causes delays during new build groundworks?

Common causes include unexpected ground conditions, incomplete design information, drainage issues, utility conflicts, access restrictions, weather and delays in arranging required inspections.

Who is responsible for arranging groundworks inspections?

Responsibilities depend on the contract and the type of inspection. The developer, principal contractor, groundworks contractor and relevant building control or other authorities may each have specific responsibilities.

Can groundworks and road construction be carried out together?

Yes, where the programme and design allow. However, road construction should be coordinated with drainage, underground services, construction traffic and the need to protect completed surfaces.

Final Thoughts

Groundworks should begin when a new build development is genuinely ready for construction, not simply when a date appears on the project programme.
Planning requirements, site investigations, foundation designs, drainage, utilities and access arrangements all influence when work can proceed.
Getting these elements coordinated early helps reduce avoidable delays, limit rework and establish a stable foundation for the rest of the development.
For developers, the most practical approach is to involve the groundworks contractor early enough to review the site, identify potential constraints and agree a realistic construction sequence.
Batten Civil Engineering Ltd has provided surfacing and civil engineering solutions since 1993 and supports projects across Sussex, Surrey, Kent and London.
If you are planning a new build development and need support with site preparation, drainage, access roads or other groundwork requirements, contact Batten Civil Engineering to discuss your project.
You can also view the Batten Civil Engineering Google Business Profile for business information and customer reviews.