House Build Cost Calculator UK
Work out what it costs to build a house or self-build in the UK: enter the gross internal floor area in square metres, choose a weathertight shell or a complete build and the finish, and get the cost in pounds, split into materials and labour. Defaults follow the 2026 self-build cost guides; replace them with your builder's prices.
By Aaghaz360 teamReviewed Rates and sources
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Cost per m² to build a house in the UK (2026)
Building a house in the UK costs about £2,500–£3,000 per m² of gross internal floor area for an average self-build in 2026, from about £2,200 for a simple, self-managed build and over £3,200 for a complex design. A 200 m² home therefore comes to roughly £440,000–£600,000 before the plot.
| Project | Cost per m² (GIA) | 3-bed, 93 m² |
|---|---|---|
| Simple, self-managed | from £2,200 | from £205,000 |
| Average self-build | £2,500–£3,000 | £233,000–£279,000 |
| Complex design or high specification | over £3,200 | over £298,000 |
Source: Build It 2026 cost guide, July 2026, rates on gross internal area. The 93 m² column is the national space standard minimum for a two-storey, three-bedroom, five-person house, multiplied out by us; build cost only.
Self-build cost calculator: what to add to the build cost
The build cost per m² covers the house itself. On top come the plot, design and engineering fees, planning and building control, a structural warranty and insurance, service connections, the driveway and landscaping, and a contingency.
Add these in the Detailed Estimate under Other costs, or set the contingency in the Quick Estimate, so the total is a full project budget rather than build cost alone.
- Design fees: budget 10–15% of the build cost (Build It).
- Planning: £610 per new dwelling for a full application in England from 1 April 2026 (MHCLG fee schedule).
- Building control: set by each council, typically about £900–£1,600 for one new house.
- Service connections: about £5,650 on average for water, electricity and drainage (NSBRC).
- Contingency: 10–15% is common; Build It suggests around 20% for a self-build.
VAT on a new build house
Building a new home is zero-rated for VAT when a VAT-registered builder does the work, including the materials they supply. Self-builders who buy materials themselves can reclaim the VAT through the DIY housebuilders' scheme within six months of completion.
So leave VAT out of the build rates for a new dwelling, but add 20% to fees.
- Zero-rated: construction of a new, self-contained dwelling and the building materials the builder incorporates (VAT Notice 708).
- Standard-rated at 20%: architects' and surveyors' fees, and plant or tool hire without an operator.
- DIY scheme: claim online or on form VAT431NB with your completion certificate and planning permission (gov.uk). Carpets, freestanding appliances and professional fees can't be claimed.
Build costs by region: London and the South East
London and the South East usually cost more to build in than the UK average, mainly because of labour, while parts of Wales, the North and Northern Ireland come in below it.
Quantity surveyors use BCIS location factors set against a UK average of 100: Kensington and Chelsea is about 131 and Pembrokeshire about 91, for example (BCIS). The full table is subscription-only, so the calculator uses one UK rate; adjust the material and labour rates for your area from local quotes.
Shell, first fix and second fix
The weathertight shell is the foundations, structure, roof and outside walls, with windows in. First fix is the hidden services and carpentry before plastering; second fix is the visible fittings after it.
Source: Build It on first and second fix.
- Weathertight shell: choose Grey structure in the calculator. There's no reliable UK shell-only rate, so enter your own or use the Detailed Estimate.
- First fix: cable runs, plumbing and heating pipework, door linings.
- Second fix: sockets and switches, sanitaryware, doors, kitchen and bathroom units, flooring and tiling.
Basement cost
A basement built as part of a new house costs less per m² than digging one under an existing home; one Build It case study came to about £990 per m² for a 150 m² basement.
Digging a new basement under an existing house costs £2,100–£4,000 per m² (Homebuilding, January 2026). The calculator prices a basement at 0.76 times the above-ground rate; get an engineer's view early, because ground conditions and waterproofing drive the cost.
Default rates for United Kingdom
The calculator starts from these GBP rates per m², data as of 2026. Change any of them in the tool to match a local quote.
| Scope and finish | GBP per m² |
|---|---|
| Grey structure | — |
| Complete, basic finish | £2,200 |
| Complete, standard finish | £2,750 |
| Complete, premium finish | £3,200 |
| Labour share of cost | 40% |
| Basement, × above-ground rate | 0.76× |
- Self-build guide figures per m² of floor area. Check whether VAT and professional fees apply to your project.
- Basement factor derived from a new basement at £1,820–2,350/m² (low confidence).
Sources: Self Build, How much does it cost to build a house in 2026? (2026); Self Build, Self-build savings (labour share, builder margin) (c. 2012); Homebuilding & Renovating, basement costs (basement factor) (undated). A dash means no reliable source: enter your own rate. See the methodology for how defaults are chosen.
More construction cost tools
- Worldwide construction cost estimator with rates for every supported country.
- Free bill of quantities template (Excel) with formulas, to price a BOQ offline.
- How to estimate construction costs, step by step.
- Other countries: Pakistan, Canada, Australia, India, UAE, Saudi Arabia.
Frequently asked questions
How much does it cost to build a house in the UK in 2026?
About £2,500–£3,000 per m² of gross internal floor area for an average self-build, from £2,200 for a simple self-managed build and over £3,200 for a complex design (Build It, July 2026). A 200 m² home costs roughly £440,000–£600,000 before the plot.
How much does it cost to build a 3-bedroom house?
A two-storey three-bedroom, five-person house has a minimum of 93 m² under the national space standard. At £2,200–£3,200 per m² that's about £205,000–£298,000 for the build alone, before the plot, fees and connections.
Do you pay VAT on a new build house?
Not on the construction: building a new dwelling is zero-rated when a VAT-registered builder does it, including the materials they supply. Architects' and surveyors' fees and plant hire without an operator are charged at 20% (VAT Notice 708).
Can I claim VAT back on a self-build?
Yes. Under the DIY housebuilders' scheme you reclaim VAT on eligible building materials, online or on form VAT431NB, within six months of completion. Carpets, freestanding appliances and professional fees aren't claimable.
What isn't included in the cost per m²?
The plot, design fees (often 10–15%), planning (£610 per new dwelling in England from April 2026), building control (about £900–£1,600), warranty and insurance, service connections (about £5,650 on average), the driveway and landscaping, and contingency.
Is it cheaper to build in the North or Scotland than in London?
Generally London and the South East cost more, mainly because of labour. BCIS location factors put Kensington and Chelsea at about 131 and Pembrokeshire at about 91 against a UK average of 100.
How much are architect fees for a new build?
Typically 5–12% of the construction cost depending on the service, with some quoting 3–15%. Build It budgets 10–15% for design fees overall, including engineers.
What do first fix and second fix mean?
First fix is everything hidden in the walls and floors before plastering: cables, pipes and door linings. Second fix is the visible fittings after plastering: sockets, sanitaryware, doors, kitchens and flooring.
Track every cost against your estimate
Aaghaz360 connects purchasing, site expenses and payments to your project budget.