Foundations & Deep Excavation · NRM2 Section 5 (Foundations, Basements & Trenches)

UK Excavation Estimating for Basements, Footings & Service Trenches

Stage-by-stage excavation takeoffs broken into NRM2 depth bands, working-space allowances, earthwork support/shoring, and trench backfill.

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How is excavation measured under RICS NRM2?

Deep basements beneath London townhouses, clay heave foundations near trees, and multi-utility service trenches require disciplined depth-band measurement. We measure exact trench profiles, underpinning sequences, trench sheets/shoring, and disposal offsite.

  • Groups dig depths consistently (up to 1.0m, 1.0–2.0m, 2.0–4.0m, and beyond) as standard NRM2 practice.
  • Includes working space clearances around external waterproofing membranes and trench sheet line setups.

Which deliverables and drawings are involved?

  • NRM2 depth-band excavation workbook
  • Shoring & temporary support areas (m2)
  • Selected backfill vs offsite cart-away summary

Drawings & Inputs Accepted

  • Foundation plans & section details
  • Basement retaining wall & secant/contiguous pile plans
  • Below-ground drainage & statutory utility layouts

Measurement & Deliverable Parameters

How are UK excavation takeoffs structured for tender accuracy?

Excavation Estimating — UK Measurement Units, Deliverables & Workflow Specification
Estimating ParameterTechnical SpecificationStandard / Audit Basis
Work Breakdown & UnitsNRM2 Section 5 (Foundations, Basements & Trenches) in m3, m2, m, nrScaled PDF / DWG plans at 1:50 & 1:100 (dimensions in mm / m)
Waste & Prelim SeparationNet physical takeoff plus 5%–10% typical trade waste splitKeeps net order counts transparent for merchant tenders
Deliverable Workbook100% unlocked formula Excel + colour-coded PDF overlaysIncludes formal RFI log flagging drawing ambiguities
Turnaround & File Transfer24–48 hrs (domestic/single trade) · up to 25 MB uploads3–5 working days typical for multi-trade commercial tenders

Calibration note: 1:50 and 1:100 architectural and structural drawings are scaled to 25 mm masonry tolerances and 100 mm thermal zones, isolating 5 percent to 10 percent wastage from net quantities.

Where is excavation estimating typically applied across UK projects?

Urban basement excavationsHouse extension strip/trench-fill footingsDrainage & utility trenching runsTraditional hit-and-miss underpinning

Targeted UK Coverage

Excavation Estimating by UK City, County & Postcode District

Major Cities

Excavation in London

Counties

Kent

Commercial Postcodes

SW1

Related Construction Trades

Demolition, Earthworks & CivilsEarthwork EstimatingView Trade →Demolition, Earthworks & CivilsConcrete EstimatingView Trade →Structure, Envelope & WeatherproofingWaterproofing EstimatingView Trade →Demolition, Earthworks & CivilsSitework EstimatingView Trade →

Excavation Estimating FAQs

Are clay-heave compressible boards (Claymaster/Cellcore) included with trench excavation?

Yes. Void-former and compressible heave protection boards specified near cohesive soils and trees are quantified directly alongside footing excavation.

Do you measure hit-and-miss underpinning sequences in bay runs?

Yes—linear underpinning walls are itemised by bay depth/width with dry-pack pinning allowances.

Do drainage trench measurements allow for pea-gravel bedding and surround?

Yes. Linear pipe lengths are paired with trench dig volumes, shingle bedding/haunch/surround, and selected backfill.

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