What's not included in the cost per m² of a self build?

Short answer

A cost per m² figure, such as Build It magazine’s 2026 average of £2,500 to £3,000 per m², is for building the house itself. It usually leaves out the land and the cost of buying it, design and professional fees, warranty and insurance, utility connections, Community Infrastructure Levy, garages, driveways and landscaping, finance costs, where you live during the build, and contingency. Some of these are large, so a first budget needs them as separate lines.

Why the gap matters

Per m² figures are a quick way to test whether a project is possible. The trouble is that they look like a whole budget when they aren’t. Members of BuildHub, the main UK self build forum, observe that self builders tend to hit budget problems towards the end of the build, which is often when the things nobody priced at the start finally turn up: the driveway, the landscaping, the final connection fees.

The checklist

Cost	Typically	What to check
Land	Bought separately and not in any build rate	Agreed price, and whether planning permission is in place or conditional
Tax on buying the land	Stamp Duty Land Tax in England and Northern Ireland; Land and Buildings Transaction Tax in Scotland; Land Transaction Tax in Wales	Which rates apply to your purchase. GOV.UK says rates differ for residential and non-residential land
Legal and survey costs on the purchase	Conveyancing, searches, title checks	Rights of way, covenants, access and boundaries before you commit
Architect and design	Fees for design and planning drawings, sometimes through to the build	What stages they cover, and whether site visits are extra
Structural engineer	Calculations and drawings for foundations, beams and frame	Whether more work is needed once the ground is known
Surveys	Topographical, ground investigation, ecology, trees, others the council asks for	Planning conditions, which can add surveys after approval
Planning and building control fees	Application fees, then building control or approved inspector fees	Whether discharging conditions brings further fees
Structural warranty	Beverley Building Society requires a 10-year structural warranty. Not every lender does: Ecology Building Society doesn’t	BuildStore advises having it in place at least two weeks before work starts
Site insurance	BuildStore says lenders will insist on it	Cover from day one, plus that each contractor has their own insurance
Utilities and connections	Water, sewer or treatment plant, electricity, gas if used, broadband	Get quotes early. Distance to the nearest supply can change the cost a lot
Community Infrastructure Levy (CIL)	Charged by some councils on new homes	See the section below. The self build exemption must be obtained before you start
Site access and groundworks surprises	Poor ground, deeper foundations, slopes, tree roots, temporary roads	A ground investigation before you firm up the foundations budget
Garage and outbuildings	Often outside the house’s floor area and so outside the rate	Budget as its own line, with its own quotes
Driveway and landscaping	Rarely in a build rate, and easy to underestimate	What planning conditions require, such as surfacing or planting
Kitchen and fitted items	Sometimes partly in a rate, sometimes not, depending on spec	What the rate or quote assumes for kitchens, wardrobes, appliances and flooring
Finance costs	Interest on borrowing, arrangement and valuation fees	Saffron Building Society charges £195 for each re-inspection, and BuildStore lists legal fees and interim inspection fees
Living costs during the build	Rent, a caravan on site, or staying on in your current home	How long the build will take, and what happens if it overruns
VAT	Depends on your route and what’s being bought	See HMRC guidance and a qualified adviser. We don’t give tax advice
Contingency	Penrith Building Society asks for evidence of a 15% contingency	Hold it as its own budget, not hidden inside other lines

Community Infrastructure Levy and the self build exemption

Community Infrastructure Levy is a charge some councils set on new development, including new homes. Not every council charges it, and rates are set locally.

The government’s CIL guidance says self build homes can be exempt, but only where the exemption has been applied for and obtained before development starts. It also says a commencement notice must be submitted before work begins. The Planning Portal explains that the claim is made on a set form, with further information sent within six months of completion.

The order matters. If you start work before the exemption is in place, or without the right notice, you can lose it and face the full charge. Check your council’s CIL page as soon as you have planning permission, and read the GOV.UK guidance for the current rules and forms.

How to build these into your first budget

Start with the per m² figure for your floor area, as a low and high range.
Add a line for every item in the checklist, even if the first figure is a guess. A guessed line is better than a missing one.
Replace guesses with quotes as soon as you can, starting with the biggest unknowns: land costs, connections and groundworks.
Hold contingency separately and watch how much is left.
Revisit the list before each stage, because some costs, like landscaping and final connections, only become real near the end.

How Self Build Budget helps

The free ranged estimate gives you a construction range from your floor area, quality and region. The Standard plan adds the working budget, with UK build stages you can customise, a separate contingency budget, and a compliance checklist that helps you remember things like warranty and building control. Each line shows budget, spent, remaining and projected cost.

Questions people also ask

Does the cost per m² include the kitchen? It depends on the figure and the spec. Check what any rate or quote assumes for kitchens, appliances and fitted furniture.

Is the land included in self build cost per m²? No. Build It’s examples price land separately from the build cost.

Do all self builders pay CIL? No. Only some councils charge it, and self builders can apply for an exemption, but it must be obtained before work starts.

How much contingency should I add? Penrith Building Society, for example, asks for evidence of a 15% contingency.

What’s not included in the cost per m²?