What is NRM2?
NRM2 — the New Rules of Measurement 2 — is a RICS (Royal Institution of Chartered Surveyors) standard, first published in 2012 and widely adopted as the UK industry benchmark for elemental cost planning. It sits alongside NRM1 (order of cost estimating at early design stages) and NRM3 (maintenance cost planning), forming a joined-up framework for the entire project lifecycle.
In practice, NRM2 is what quantity surveyors reach for when they need to produce a budget that will survive scrutiny: from a client seeking lender sign-off, to a main contractor pricing a competitive tender, to a project manager tracking against a contract sum. It provides a common language for decomposing construction costs into defined elements, which makes comparison between projects and benchmarking against historical data far more reliable.
Key point: NRM2 is a measurement standard, not a pricing standard. It tells you how to organise and measure costs, not what rates to use. Rates must reflect your market — for London projects that means using Greater London benchmarks, not national averages.
The NRM2 Element Structure
The NRM2 framework organises building costs into a hierarchy of elements, sub-elements, and components. At the top level, the eight main work elements are:
- Element 1 — Substructure (foundations, ground floor slab, basement construction)
- Element 2 — Superstructure (frame, upper floors, roof, stairs, external walls, windows, doors)
- Element 3 — Internal finishes (wall finishes, floor finishes, ceiling finishes)
- Element 4 — Fittings, furnishings & equipment (kitchen units, sanitary ware, ironmongery)
- Element 5 — Services (M&E: heating, ventilation, plumbing, electrical, fire, lift installations)
- Element 6 — Prefabricated buildings & building units (pods, modular units)
- Element 7 — Work to existing buildings (alterations, refurbishment, demolition)
- Element 8 — External works (drainage, hard and soft landscaping, boundary treatments)
Below these sit the measured works sub-totals, followed by three further cost centres that every cost plan must include:
- Preliminaries — the contractor's site overheads: project management, temporary works, welfare, insurances, scaffolding time-related charges. Typically 12–18% of measured works in London.
- Contingencies — an allowance for design development risk and unforeseen conditions. Standard practice is 5–10%, reducing as design information matures.
- Overheads & profit (OHP) — the contractor's company overhead recovery and margin, usually 5–8% on competitive London tenders.
Building a Cost Plan Step by Step
Building a robust NRM2 cost plan follows a logical sequence. Cutting corners at any stage propagates errors through the entire document.
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1
Scope definition. Establish what is included and excluded. Agree the GIA (gross internal area) from floor plans, confirm which NRM2 elements apply to the project type, and note any specialist items (listed building works, contaminated land, complex M&E) that will need separate allowances.
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2
Elemental quantities. Measure each element from drawings or a BIM model. At early design stages you work from an elemental ratio (e.g. external wall-to-floor ratio); at detailed design you measure item by item. GIA drives most elemental rates.
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3
Rate application. Apply a cost per m² or per unit to each measured element, using current London market data, recent tender returns, or a recognised pricing guide. Document your rate assumptions — auditors and employers’ agents will ask.
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4
Preliminaries calculation. Add prelims as a percentage of the measured works total. For a typical London residential project, budget 14–16%. Complex projects with long programmes, tight access, or phased occupation will sit toward the upper end.
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5
Contingency and OHP. Apply contingency to the sub-total of measured works plus prelims. Then apply OHP on top of everything. Do not apply contingency twice — a common error is to include it both as a line item and as a percentage uplift.
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6
Totals and benchmarking. Calculate the cost per m² of GIA for the whole project and compare to sector benchmarks. If your figure is 30% above or below the benchmark, investigate before issuing — it usually signals a measurement error or a missing element.
London Market Rates 2026
Rates shift with material costs, labour availability, and tender market competition. The following figures represent mid-range London contractor rates for Q1–Q2 2026, excluding VAT and professional fees, based on typical residential and mixed-use projects within the M25. High-specification fit-outs or complex historic buildings will sit toward or above the upper bound.
| Project Type | Cost per m² GIA (excl. VAT) | Notes |
|---|---|---|
| Whole house refurbishment | £1,600 – £2,100 | Strip-out and re-fit; excludes extensions |
| Rear single-storey extension | £2,400 – £2,800 | Typical terrace or semi; full fit-out |
| Loft conversion (dormer) | £2,000 – £2,400 | 30–40m²; structural, M&E, finishes |
| New build residential | £2,600 – £3,200 | Traditional build; central London at upper end |
These rates include preliminaries but exclude VAT, professional fees (architect, structural engineer, party wall surveyor), planning application fees, and building control fees. Always present your cost plan with a clear exclusions schedule.
Common Mistakes
Even experienced estimators make the same errors when producing NRM2 cost plans. The ones that come up most frequently on London residential and commercial projects are:
Using national rates in a London project. BCIS national averages typically run 20–30% below London actuals. A cost plan built on BCIS medians without a location factor applied will underestimate by a significant margin and may not survive a value engineering review.
- Forgetting Party Wall costs. On terrace and semi-detached properties in London, party wall agreements are near-universal for extensions and loft conversions. A surveyor’s fee of £1,500–3,000 per neighbour is a real cost that must appear in the exclusions schedule or as an allowance.
- Understating or omitting preliminaries. Many self-prepared budgets show the trade costs only and present them as a final figure. Prelims of 14–16% on top of trades materially changes the total — a £100,000 trade cost becomes £115,000 with prelims before contingency and OHP are added.
- Double-counting contingency. If contingency is already embedded within your elemental rates (e.g. you’ve added a “risk buffer” to each rate) and then you apply a further 10% contingency percentage, you are double-counting. Keep rates clean and carry contingency as a single, explicit line item.
- Measuring from outdated drawings. Always confirm which drawing revision was used for measurement. A revision after planning approval can change GIA, roof form, or structural configuration — all of which affect elemental costs substantially.
- Ignoring phasing and access constraints. London sites often have restricted access, tight working hours, or require phased occupation. These add to prelims and should be flagged as assumptions rather than hidden in a contingency allowance.
How BuildPilot Automates This
Producing a rigorous NRM2 cost plan manually takes a skilled QS four to eight hours for a typical residential project — more if drawings are incomplete. BuildPilot compresses that to under 24 hours. You submit your project brief and any available drawings; our AI reads the brief, extracts scope and GIA, maps every item to the correct NRM2 element, and applies London-verified rate data calibrated against recent tender returns. The output is a fully structured Excel cost plan with elemental breakdowns, a prelims schedule, a marked exclusions list, and an overall cost per m² benchmark check. You get a document you can hand straight to a client or employer’s agent — no reformatting required.