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New Build House Cost Estimates UK

Building a new house from the ground up is one of the biggest financial commitments you'll make. Before a single brick gets laid, you need numbers you can actually rely on, not an online calculator that doesn't know your site, your spec, or your location.

check Detached, semi-detached & terraced houses
check Full elemental cost breakdown by trade
check Regional UK rates, not national averages
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±5%
Estimate Accuracy
10–48 hours
Days Turnaround
3,000+
Projects Costed
New build detached house under construction UK

What Does a New Build Really Cost in the UK?

The figures you'll find quoted online, anywhere from £1,750 to £3,500 per square metre, are technically correct, but they're also almost useless on their own. What you're actually paying depends on the house type, the specification you choose, where in the country you're building, and what your ground conditions are like. Two houses that look identical on paper can end up with build costs 30% apart once you factor all of that in.

In our experience, the biggest mistake people make at this stage is using m² benchmarks to set a budget and then finding out six months later, when contractors are pricing, that reality looks quite different. A professional cost estimate done before you go to tender sorts that out early, before it becomes expensive.

Our residential construction cost estimating service covers new build projects from initial feasibility through to detailed pre-tender estimates, giving you accurate numbers at whichever stage you're at.

For a standard 3-bed detached house of around 100,120m², build costs in the UK typically fall between £265,000 and £380,000 depending on specification and region, before professional fees, external works, or contingency.

Why a Generic Figure Will Cost You More

Every online calculator gives you a number. Some give you a table. None of them know your site, your ground conditions, your chosen construction method, or what your local contractor market looks like right now. That's the problem.

We've seen clients go to tender with budgets built on national averages, only to find contractor returns come in 20–35% higher. At that point you're either redesigning, reborrowing, or walking away from a project you've already spent money planning.

A professional estimate costs a fraction of what a budget shortfall does. We look at your specific drawings, your specification, and your location, and we give you a number you can actually tender against, finance against, and build to.

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Online calculator
National average, no site knowledge, wrong specification, outdated rates
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Blaze Estimating
Your drawings, your spec, your region, accurate to ±5% and ready for tender
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What Goes Into a New Build Cost Estimate

A proper new build estimate isn't just the bricks and mortar. Here's what we break down for every project.

foundation

Substructure

Excavation, foundation type (strip, raft, pile), ground beams, oversite slab, often the most variable element depending on ground conditions.

domain

Superstructure

External walls, structural frame, upper floors, roof structure and covering, the main shell of the building costed by element and trade.

window

External Envelope

Windows, external doors, insulation levels, cladding, rendering, all priced against your specification and Building Regulations requirements.

electrical_services

Mechanical & Electrical

Heating system (boiler, heat pump, underfloor), plumbing, electrical first and second fix, consumer unit, ventilation, full M&E breakdown.

format_paint

Internal Finishes

Plastering, flooring, tiling, painting, kitchen and bathroom fit-out, costed per m² and per item with your chosen specification level.

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External Works & Prelims

Drainage, landscaping, driveways, site fencing, plus contractor preliminaries and overheads, everything that gets missed in basic calculators.

Regional Cost Variations Across the UK

Where you build has a significant effect on what you pay. Labour rates and material logistics vary quite a bit across the UK, something that online calculators tend to flatten out into a single national figure. We use region-specific rates, so your estimate reflects what it actually costs to build in your area, not somewhere else.

London & South East
Highest labour rates in the UK
+15–25%
above national avg
Midlands & East of England
Mid-range, stable pricing
±0–5%
national average
North West & Yorkshire
Competitive rates, skilled trades available
,5–10%
below national avg
Scotland & Northern England
Lower labour, higher logistics for rural
,8–12%
below national avg
Wales
Broadly in line with Northern England
,8–12%
below national avg
Northern Ireland
Most competitive labour rates in UK
,12–18%
below national avg

What Our New Build Estimating Service Covers

We produce four types of estimate for new build projects, depending on where you are in the process.

1

Feasibility Budget

An early-stage order of cost, enough to know whether your project is financially viable before spending money on detailed drawings. Turnaround typically 2–3 days.

2

Pre-Planning Estimate

A more detailed cost plan tied to your architectural drawings, covering all key elements and giving you a reliable budget to work from through the planning stage.

3

Pre-Tender Cost Plan

A full elemental breakdown covering every trade, substructure through to external works, ready to go alongside your tender package to contractors.

4

Bills of Quantities

A measured Bills of Quantities prepared to NRM2 standard, giving contractors a common pricing document and making tender returns directly comparable.

New Build Cost Estimate FAQs

Does your estimate include professional fees and contingency?expand_more
Our estimate covers the construction cost, the actual building work. We present professional fees (architect, engineer, planning) and a recommended contingency allowance separately, clearly labelled, so you can see the full project budget without the two getting mixed in. On most new build projects we recommend 10–15% contingency on top of construction cost.
How accurate is a new build estimate before detailed drawings are done?expand_more
At feasibility stage, with outline drawings and a basic brief, we typically achieve ±15% accuracy, which is enough for go/no-go decisions and funding discussions. Once detailed architectural drawings are available, we can get that down to ±5%. We always tell you clearly what accuracy level applies to your estimate and what information would improve it further.
Will banks or mortgage lenders accept your estimate?expand_more
Yes, our cost reports are prepared by professional estimators following industry measurement standards and are accepted by UK self-build mortgage lenders and development finance providers. If your lender has a specific format requirement, let us know and we'll accommodate it.
Can you estimate a new build if I only have planning drawings, not full working drawings?expand_more
Yes, and we do this regularly. Planning drawings are enough to produce a solid pre-tender cost plan. We work from floor plans, elevations, and sections, supplemented by your brief on specification level, and we're clear about what assumptions we've made so you can refine the estimate as drawings develop.
Do you cover eco builds, timber frame, and modular homes?expand_more
Yes, we estimate across all construction methods including traditional masonry, timber frame, structural insulated panels (SIPs), and modular / volumetric systems. Eco builds with Passivhaus specifications, air source heat pumps, MVHR systems, and solar are something we cost regularly, the M&E element in particular can vary significantly depending on the system chosen.

Related Residential Estimating Services

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