New Build Groundworks Sequence

A new-build groundworks sequence is the ordered path from a prepared plot to foundations, drainage, and a formation ready for slab or superstructure. Housing and small commercial schemes share the same logic, with extra holds where adoptable roads and sewers apply.

Use this page for sequence planning. The general process overview sits on groundworks-process; enabling definitions on what-are-enabling-works; plot-level commercial sequencing on plotworks-explained. Do not expand this into a full S38 manual — link the flagships.

review Groundworks Contractors in Wandsworth and Groundworks Contractors in Kingston.

When sequence matters

When writing a construction programme; when multiple plots share plant; or when drainage adoption inspections must interleave with foundation pours.

Typical sequence

Step 1: Enable and set out
What this step delivers: Plot ready for dig.
Step 2: Foundations
What this step delivers: Piles or shallow foundations complete.
Step 3: Drainage and services
What this step delivers: Networks installed and tested.
Step 4: Prepare for next trade
What this step delivers: Formation protected; records issued.

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What each stage delivers

A common order is: enabling and clearance → setting out → reduced level / foundation dig → piles or shallow foundations → drainage and services → testing → backfill and plot preparation for the next trade.

On estate schemes, road formation and sewer adoption testing can run in parallel packages and must not fight plot foundation digs for space.

Weather, concrete curing, and inspection booking create real gaps between “dig finished” and “ready for brickwork”.

Programme risks and hold points

Programme lists dig, found, drain as separate stages
BC / adoption inspections booked
Multi-plot plant sharing assumed
Attenuation or sewer works on the critical path
Handover criteria for superstructure defined

Pre-start and handover checklist

Foundation type per plot / block
Drainage and adoption holds
Spoil and wagon logistics
Inspection booking lead times
Next-trade ready-state

Keeping trades coordinated

Run the sequence with clear package owners, protect completed formations, and issue as-builts that the next trade and adopting bodies can use.

Where time and cost usually escalate

Out-of-sequence working (damaging drainage while founding later plots, or trafficking uncured formation) creates expensive rework. Shared muck routes and crane/age of access matter on multi-plot sites.

Frequently asked questions

Should drainage come before or after foundations?

It depends on the design and clash risk. Many schemes found first then drain, but deep sewers or attenuation can force a different order. Follow the coordinated drawings.

Where is estate adoption sequencing covered in depth?

See the S38 & S104 programme explained, drainage adoption process, and plotworks-explained.

How This Issue Is Normally Diagnosed and Repaired

Follow the typical path from problem identification through to resolution:

We provide these services across the UK, including

London Richmond Chiswick Wimbledon Fulham Hammersmith Ealing

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Planning a new-build groundworks programme? Share drawings and plot release order.

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