Free build cost calculator, 2026 figures
How Much to Build a House UK, and How to Make It Happen
Build costs in 2026 run from £2,300 to £3,600 per m², before the plot, the fees and the VAT. Get your own number below, then see the four things that decide whether the house gets built at all.
Quick Cost Estimate
Get an instant estimate with just 3 inputs
£2,900/m²
×1.00 multiplier
Estimated Build Cost
£435,000
150 m² × £2,900/m² × 1.00
Total Project Cost
£654,349
Includes fees, surveys, utilities & contingency
Want a more detailed breakdown?
How to make it happen
Four things decide whether a self build happens
Most people who price up a self build never start one. The number above is rarely what stops them. What stops them is one of four gates, so here is each one plainly, with the tool that gets you through it.
A plot
This is the gate most people never get through. Plots with permission are scarce and sell quickly. Land without permission is cheaper, and adds a year or more before you can start.
Browse plots and sites in the pipelinePlanning
A plot with full permission takes the biggest risk off the table. Raw land means an application: eight weeks by statute, ten to sixteen in practice, and it can be refused.
Test a site against the 2026 planning rulesMoney
Self-build mortgages release money in stages, so you need the deposit, the plot price and enough cash to reach each stage. New homes are zero-rated for VAT and most councils exempt self builders from CIL, which helps the arithmetic.
Time
From buying a plot to moving in, most UK self builds take 18 to 24 months. Raw land adds six to twelve months of planning before that. Plan for where you will live in the meantime, and what that costs.
See the full timeline
The first step is a form
Join your council’s self-build register. Most are free, some charge a fee, and none commit you to building. By law the council must count you and grant enough permissions to match the demand on its register, so being counted is part of how plots get made.
Detailed Cost Breakdown & Advanced Options
Customize all assumptions, add surveys, utilities, and get a comprehensive breakdown of your self-build budget.
Leave empty to use region default (×1.00). Set a custom value to override.
Applied to project costs including estimated finance and VAT, before contingency. Excludes the plot, purchase taxes and conveyancing. Default: 12%.
Surveys & Reports4 items selected£5,050
Utilities & Site Setup5 items selected£9,150
Insurance & Warranty2 items selected£4,700
Statutory Fees, VAT & CILPlanning £610, Building control £1,500£2,560
England (1 Apr 2026): £610 per dwelling (full app, up to 10 dwellings).
Includes directly hired trades. Checked: no VAT added to build + externals, assuming zero-rating or an eligible reclaim. Add irrecoverable VAT, including on non-qualifying external works, below. Unchecked: a flat 20% estimate applies; this does not model reduced-rate conversions.
VAT on fees is not added automatically. Include it here if your fee estimates exclude VAT, plus other irrecoverable VAT and insurance taxes.
Submit forms before commencement.
Finance Options60% financed · APR 6.0% · 12 months£10,330
Plot, Taxes & LegalsPlot £150,000, Tax £0, Legal £1,800£151,800
Important Considerations
- ✓ Party Wall notices
- ✓ Access & driveway
- ✓ Landscaping & boundaries
- ✓ Kitchen & bathroom allowances
- ✓ Renewables & grants
- ✓ MVHR & airtightness
- ✓ Temporary accommodation
- ✓ Running costs
Estimates only. Costs vary hugely by site, timing and local market conditions. Always get quotes and verify tax/planning details with official sources.
Already own the land?
See what your land could be worth.
If you own a plot or paddock that could fit 1–20 homes, our planning experts can secure permission on a no-win-no-fee basis — and selling to self-builders typically delivers 50–100% more than a developer offer.
Plot price by type
Build cost is only half the project — plot price is the other half, and it varies dramatically by plot type. The calculator above estimates the build; this section anchors the plot side. Five categories of self-build plot in the UK, ranked from cheapest and slowest to most expensive and quickest to start on.
| Plot type | Typical price (Midlands) | Time to start on site | Costs still to pay |
|---|---|---|---|
| Unserviced raw land | £10–£60k | 18–24 months | Planning application, utility connections (£15–£40k+) |
| Outline / PiP plot | £40–£100k | 6–12 months | Reserved matters or technical details consent, connections |
| Full permission plot | £70–£170k | 1–3 months | Utility connections, sometimes Section 106 |
| Custom build plot | £90–£220k | Weeks | Design code compliance, estate road contributions |
| Serviced plot | £100–£250k+ | Weeks | Per-utility connection fees may still apply |
Figures are for a typical 0.06–0.12 ha plot in the Midlands. London and the South East run 40–80% higher; northern England and parts of Scotland and Wales run 20–40% lower. Plots in protected landscapes (AONB, conservation areas) or with strong views can sit well outside these ranges.
What you're paying for when a plot is "serviced"
The £40–£80k typical premium of a serviced plot over an equivalent unserviced one covers, roughly:
- Planning application work and consents (£8–£25k for a small site)
- Site access road and surfacing (£10–£25k)
- Mains water, electricity and drainage brought to the plot boundary (£8–£20k)
- Section 106 or CIL contributions paid up-front by the developer
- Risk premium and margin for the developer who brought the plot through planning
On an unserviced plot, you do this work yourself over 12–24 months and capture the value as project equity rather than paying it as a plot premium. On a serviced plot, you trade that equity for time — typically the right call for a first-time self builder.
Don't forget stamp duty
Plot purchases above the SDLT threshold attract Stamp Duty Land Tax. The residential / non-residential classification — which depends on planning status and whether construction has begun — is the biggest variable in the bill, and can shift the additional-dwelling surcharge on or off.
Stamp duty on self build plots — full guide →Not sure which plot type fits you? Use the plot type finder on the self-build hub.
Frequently Asked Questions About UK House Build Costs
How much does a self build cost per square metre in the UK?
In 2026, self build costs typically range from £2,300 to £3,600+ per square metre depending on specification:
- Basic specification: £2,300/m² - Standard finishes, basic systems
- Standard specification: £2,900/m² - Good quality finishes, modern systems
- High specification: £3,600/m² - Premium finishes, high-end features
These figures are for the build only and exclude plot costs, professional fees, VAT and other project expenses.
What is the total cost of a self build project including all expenses?
For a complete self build project, expect to budget approximately 1.5-2x the basic build cost to cover all expenses:
- Build cost: 60-70% of total project
- Professional fees: 10-15%
- External works: 8-12%
- Surveys, utilities, fees: 5-10%
- Contingency: 10-15%
Plus plot cost and associated purchase taxes (SDLT/LBTT/LTT).
How accurate is this self build cost calculator?
Our calculator provides order-of-magnitude estimates based on current UK market rates. Accuracy depends on:
- How well you know your specification requirements
- Local market conditions and contractor availability
- Site-specific challenges (access, ground conditions, utilities)
- Timing of your build (material costs fluctuate)
Always get detailed quotes from contractors and professionals for accurate pricing.
Do I need to pay VAT on my self build?
VAT depends on the work and whether the dwelling qualifies under HMRC’s rules:
- New-build labour: Qualifying construction work on a new dwelling is zero-rated, including work by VAT-registered trades you hire directly. A main contractor or a materials-and-labour package is not required.
- Building materials: Eligible materials supplied and installed by the contractor share the zero rate. Materials you buy yourself usually carry VAT; eligible purchases can be reclaimed through HMRC’s DIY housebuilders scheme.
- Professional fees: Separately supplied architect, surveyor and consultant services normally carry 20% VAT if the supplier is VAT-registered. This VAT cannot be reclaimed under the DIY scheme.
- Conversions and renovations: Usually 20%, but qualifying conversions and certain empty-home renovations can attract 5% on construction services and eligible materials supplied with them. Materials bought separately normally carry 20%.
Keep VAT invoices and check eligibility. For builds completed on or after 5 December 2023, submit your DIY claim within six months of completion. VAT charged incorrectly on zero-rated work must be corrected by the supplier.
Sources: HMRC VAT Notice 708 and DIY housebuilders refund guidance. VAT advice checked 10 September 2026.
What professional fees should I budget for?
Professional fees typically account for 10-15% of your total build cost:
- Architect: 8-15% of build cost (depending on service level)
- Structural engineer: 1-3% of build cost
- Quantity surveyor: 1-2% of build cost (cost control)
- Planning consultant: £2,000-£10,000+ (if required)
How much contingency should I include?
We recommend a minimum 10-15% contingency on your total project cost:
- Experienced self-builders: 10-12% contingency
- First-time self-builders: 15-20% contingency
- Complex or rural sites: 20%+ contingency
- Listed buildings/conversions: 25%+ contingency
Contingency covers unforeseen costs, specification changes, and market fluctuations.
What are the main cost differences between regions in the UK?
Build costs vary significantly by region:
- London & South East: +20-40% above national average
- South West (popular rural areas): +10-20%
- Midlands: Close to national average
- Northern England: -10-20% below average
- Scotland: -5-15% below average (varies by area)
- Wales: -5-15% below average (varies by area)
- Northern Ireland: -15-25% below average
Rural locations may have higher costs due to transport and contractor availability.
How long does a self build take and how does this affect costs?
Typical self build timelines:
- Planning & design: 6-12 months
- Construction: 10-16 months for typical homes
- Total project: 18-30 months from start to completion
Longer builds increase finance costs and may be subject to material price inflation. Weather delays, planning complications, and specification changes can extend timelines.
What decides whether a self build actually happens?
Four things: a plot, planning permission, money and time. Plots with permission are scarce, so most projects stall at the first gate. Self-build mortgages release funds in stages, so cash flow matters as much as the total. Most UK self builds take 18 to 24 months from plot to moving in. The lowest-commitment first step is joining your council’s self-build register: most are free, some charge a fee, none commit you to building, and councils must count the demand on their register when deciding how many plots to permit.
Ready for Your Next Step?
Start Your Self-Build Journey
Find plots with planning permission, connect with architects, and get expert guidance to bring your self-build vision to life.
Explore self-build resourcesThis tool provides order‑of‑magnitude estimates for UK self‑builds. Always get itemised quotes. Planning fees, tax and grants change periodically; check your local authority and GOV.UK.