How much does it cost to build a house in the UK per m²?
Short answer
Build It magazine’s 2026 guide puts the average UK self build at around £2,500 to £3,000 per m² of gross internal floor area (GIA). A cost-conscious, self-managed build with a simple design can come in at about £2,200 per m², high-end projects run above £3,200 per m², and some very high spec homes pass £6,000 per m². These are construction costs: land, fees and other costs sit on top.
What “per m²” actually measures
The figure is a price per square metre of finished floor space, measured as gross internal floor area, or GIA. GIA is the area inside the external walls, on every floor, including internal walls, stairs and circulation space. It does not include the thickness of the external walls.
That matters when you compare figures. Some suppliers, particularly package and kit home companies, quote on gross external area (GEA), which includes the walls and so gives a bigger area and a smaller-looking rate. Build It points this out for at least one supplier. Before you compare two per m² figures, check they are measuring the same thing.
To get your GIA, take your architect’s drawings (or a rough sketch) and add up the internal area of each floor. If you only have a target number of bedrooms, the size pages below give a feel for what that tends to mean in m².
Why a range is more honest than one number
A single figure such as “£2,750 per m²” looks precise, but at the start of a project almost nothing is fixed. You don’t yet know what the ground is like, what your spec will be, or what quotes will come back at. A range shows that uncertainty instead of hiding it.
We use the low end to see the best case and the high end as the planning figure. If the high end doesn’t work with your money, it’s far better to know now, while you can still change the design, than halfway through the build.
What pushes the figure up or down
| Driver | What it does to cost |
|---|---|
| Specification | The biggest single lever. Kitchens, bathrooms, glazing, flooring and heating systems vary hugely in price. |
| Region | Build It’s 2026 figures show labour and materials costing more in some areas, for example the South East at 104% and Scotland at 105% of its “rest of UK” baseline. |
| Build route | Build It says a main contractor typically adds around 20% for profit and overheads, and managing the trades yourself can save roughly that much. Paying a project manager typically costs 5% to 7% of build cost. |
| Construction system | Brick and block, timber frame, SIPs and other systems differ in cost and in when the money is needed. BuildStore notes timber construction costs more than brick and block in the early stages. |
| Design complexity | Corners, cantilevers, large spans and lots of glazing all add cost. A simple rectangle with a straightforward roof is cheapest per m². |
| Performance targets | Build It notes that building to Passivhaus standard can cost around 20% more. |
| The site | Slopes, poor ground, difficult access, trees and services a long way off all affect foundations and groundworks. |
Turning a per m² figure into a first budget
- Work out your GIA. Add up the internal floor area of every storey.
- Pick a band that fits your plans. Be honest about spec and route. If you’ll use a main contractor and want good finishes, the lower end probably isn’t you.
- Multiply out a low and a high figure. For example, 180 m² at £2,500 and £3,000 gives £450,000 to £540,000 for construction. That’s simple arithmetic on Build It’s 2026 band, not a quote.
- Add the things per m² doesn’t cover. Land, fees, connections, warranty, landscaping and more. See what’s not included in the cost per m².
- Add contingency. Penrith Building Society, for example, asks for evidence of a 15% contingency.
- Replace guesses with quotes as they arrive. The estimate is a starting point. Its job is to be overtaken by real numbers.
Build It also has an online build cost calculator if you want a second view.
Costs by house size
On our build
We started Highfields with a spreadsheet and a crude cost per m². It was good enough to tell us whether the project was possible at all. It couldn’t tell us where we stood once quotes started arriving, because each one covered different things. That’s why we treat a per m² figure as the first step, not the budget.
How Self Build Budget helps
The free ranged estimate takes your floor area, quality level and region and gives you a low and a high figure rather than a single number. When you’re ready, the Standard plan turns that into a working budget by UK build stage, so each estimate line can be replaced by quotes and then actual payments. See the method for how the steps fit together.
Questions people also ask
Is £2,000 per m² realistic in 2026? It’s below the lowest figure in Build It’s 2026 guide, which is about £2,200 per m² for a cost-conscious, self-managed, simple build. Lower figures are possible on some package routes, but check what they exclude.
Does the per m² cost include the garage? Usually not, unless the garage is counted in the GIA. Detached garages and outbuildings are best budgeted separately.
Is it cheaper per m² to build bigger? Often a little, because fixed costs such as connections, design and site setup are spread over more floor area. But bigger homes also tend to get higher specs, which can cancel that out.
Does the per m² figure include VAT? How VAT applies to a new build is its own subject and depends on your route. See HMRC’s guidance on VAT refunds for new builds if you’re a DIY housebuilder and speak to a qualified adviser. We don’t give tax advice.