Construction Cost Plan: NRM1 Guide, Free Template, and How to Build One Fast

A construction cost plan is a structured, elemental breakdown of what a building project is expected to cost, prepared and refined by a quantity surveyor as the design develops. It takes the total budget and divides it across the recognised building elements (substructure, superstructure, services, external works, and so on), so the client and design team can see where the money is going and control it before anything is built. In UK practice a cost plan is normally built using the RICS New Rules of Measurement 1 (NRM1), which set out a standard order of cost estimating and elemental cost planning.

This guide explains the cost planning stages, the NRM1 elemental structure, and how to read and challenge a cost plan. It gives you a free cost plan template, a UK worked example, and shows how to build the first draft in minutes rather than days using AI.

What a cost plan is for

A budget figure on its own is almost useless. "The scheme is 4.2 million" tells you nothing about whether that number is right, where the risk sits, or what to cut if the tender comes back high. A cost plan turns a single number into a controllable document.

It does four jobs:

• Sets and tests the budget. The first cost plan checks whether the client's aspirations fit their money, early enough to change the brief rather than the building.
• Allocates cost to elements. By splitting the total across substructure, frame, envelope, finishes, services, and externals, the team can see which elements are driving cost.
• Controls change. As the design develops, every cost plan is compared against the last. If the frame has jumped 200k, someone has to explain why. This is cost control, not just cost estimating.
• Informs value engineering. When the number is too high, the elemental breakdown shows where the savings realistically are.

A good cost plan is a live document. It is reissued at each design stage, getting more accurate as the design firms up and the risk allowances come down.

The RIBA stages and cost plan stages

Cost planning tracks the RIBA Plan of Work. NRM1 defines a formal sequence: an initial order of cost estimate, followed by a series of formal cost plans.

The order of cost estimate is the roughest. It is often just gross internal floor area multiplied by a rate per square metre taken from cost data or a comparable project, plus allowances. By formal cost plan 2 and 3, the surveyor is measuring real quantities from the developing drawings and pricing them element by element. The pre-tender estimate is the final check before tenders come in, and the yardstick tenders are judged against.

The NRM1 elemental structure

The heart of a cost plan is the elemental breakdown. NRM1 groups the building into standard elements so that every cost plan in the country is comparable. The main groups are:

• Facilitating works. Demolition, site clearance, temporary works, remediation.
• Substructure. Foundations, ground slabs, basement.
• Superstructure. Frame, upper floors, roof, stairs, external walls, windows and doors, internal walls and partitions, internal finishes.
• Fittings, furnishings and equipment (FF&E).
• Services. Sanitary, disposal, water, heat source, space heating, ventilation, electrical, fire protection, communications, lifts, builders work in connection.
• Prefabricated buildings and building units.
• Work to existing buildings. For refurbishment and extension projects.
• External works. Roads, paths, landscaping, external drainage, external services, minor building works.

On top of the measured elements sit the additions that clients often forget and surveyors always include:

• Preliminaries. The contractor's cost of running the site: site management, welfare, plant, scaffolding, insurances. Typically a percentage of the works cost.
• Overheads and profit (OH&P). The contractor's margin, again usually a percentage.
• Risk allowances. NRM1 splits risk into design development risk, construction risk, employer change risk, and other project risks. These reduce as the design and information firm up.
• Inflation. Both tender inflation (to the date of tender) and construction inflation (over the build period).

Getting these additions right matters as much as the measured work. A cost plan that shows a strong works figure but a thin preliminaries or risk allowance is a cost plan that will embarrass someone at tender.

How to read and challenge a cost plan

If you receive a cost plan as a client or project manager, do not just look at the bottom line. Interrogate it:

• Check the gross internal floor area (GIA). Every rate depends on the area. If the GIA is wrong, everything is wrong.
• Compare rates against benchmarks. Is the cost per m2 sensible for this building type and location? RICS Building Cost Information Service (BCIS) data and comparable projects are the reference.
• Look at the risk allowances. At early stages they should be generous. If a Stage 2 cost plan carries only 3 percent design development risk, be suspicious.
• Check inflation. In a volatile market, an out-of-date inflation allowance can be the single biggest error.
• Read the exclusions and assumptions. This is where the real risk hides. Excluded items (client direct costs, loose FF&E, VAT, land, professional fees if separate) can add up to serious money.

A worked cost plan example

Here is a simplified order of cost estimate for a small commercial project, of the kind you would produce at RIBA Stage 1.

Project: Two-storey office, new build. GIA: 1,200 m2. Location: regional UK.

Say the figure comes in at 2.73 million and the client's budget is 2.4 million. The value of the cost plan is now obvious: the gap is visible at Stage 1, when you can still change the brief, reduce the specification, or shrink the floor area. Without the elemental breakdown you would only discover the problem at tender, when it costs a fortune to fix.

Note also how much of the total sits in preliminaries, OH&P, risk, and inflation: over 770,000 on top of a works cost of under 2 million. Anyone who estimates a building on works cost alone will be badly wrong.

How to build a cost plan faster with AI

Cost planning is skilled work and AI does not replace the surveyor's judgement. What it does replace is the slow, mechanical parts: setting up the elemental structure, drafting the assumptions and exclusions, sanity-checking rates against a description, and writing the narrative that explains the cost plan to the client.

A sensible AI workflow looks like this:

1. Feed the AI the project parameters. Building type, GIA, number of storeys, location, quality level, and any known constraints.
2. Ask it to produce a first-pass elemental cost plan using the NRM1 element groups, with placeholder rates flagged for you to confirm against BCIS or your own data.
3. Have it draft the assumptions, exclusions, and risk narrative. This is the writing that eats an afternoon and that AI produces in seconds.
4. Review, price, and correct. You apply real rates, adjust the risk allowances to the stage, and check nothing has been invented. The judgement stays with you.

The result is a structured first draft in minutes instead of a blank spreadsheet. Our generate preliminary cost plan workflow gives you the exact prompt, and the wider AI for cost estimation guide covers estimating tasks beyond cost planning. If you want the full set of construction prompts, they are in the BuildCopilot Prompt Pack. For the tool itself, Claude for construction handles the long, structured documents that cost planning produces particularly well, and the broader AI construction estimating guide puts cost planning in context.

Common cost plan mistakes

• Pricing on works cost alone. Forgetting or under-allowing preliminaries, OH&P, risk, and inflation is the classic way to under-estimate a project.
• Risk allowances that never move. Risk should be high early and fall as information firms up. A flat allowance across all stages is a red flag.
• Stale inflation figures. In a fast-moving market, an inflation allowance set six months ago can be the biggest single error in the document.
• Weak exclusions. If the exclusions are vague, the client assumes everything is included, and the argument comes at tender.
• Not tracking change. A cost plan that is not compared element by element against the previous version is an estimate, not cost control.

Free cost plan template

Use our free construction cost plan template to structure your next estimate around the NRM1 elements, with preliminaries, OH&P, risk, and inflation built in. Pair it with the AI workflow above and you get a professional, well-structured cost plan without starting from a blank page.

Frequently asked questions

What is a construction cost plan?

A construction cost plan is a structured estimate that breaks a project's total cost down across the recognised building elements (substructure, superstructure, services, external works, and so on). It is prepared by a quantity surveyor and refined at each design stage, so the client and design team can control cost before and during construction rather than discovering problems at tender.

What is the difference between a cost plan and an estimate?

An estimate is a single figure for what something will cost. A cost plan is a live, elemental document that allocates that figure across the building elements, adds preliminaries, overheads, risk, and inflation, and is reissued and compared at each design stage. Cost planning is about control over time, not just a one-off number.

What is NRM1?

NRM1 is the RICS New Rules of Measurement 1: Order of cost estimating and cost planning. It provides a standard structure and set of rules for preparing order of cost estimates and elemental cost plans in UK construction, so that cost plans are consistent and comparable between projects and surveyors.

What should a cost plan include?

A cost plan should include the elemental works costs (substructure, superstructure, finishes, services, external works), preliminaries, overheads and profit, risk allowances split by type, and inflation to both tender and completion. It should also state the gross internal floor area, the rates used, and a clear list of assumptions and exclusions.

How accurate is a cost plan?

Accuracy improves as the design develops. An early order of cost estimate at RIBA Stage 1, based on a cost per square metre, carries a wide range and generous risk allowances. By RIBA Stage 4, with measured quantities and firm information, the cost plan should be close to the tender figure, which is why risk allowances are reduced at each stage.

Can AI write a cost plan?

AI can produce a structured first-pass cost plan, draft the assumptions, exclusions, and risk narrative, and sanity-check rates, all in minutes. It does not replace the quantity surveyor's judgement on rates, risk, and specification. Used well, it removes the mechanical setup and writing so the surveyor spends their time on the parts that need experience.