This guide gives you a realistic framework for budgeting your home extension or self build in Glasgow and Scotland. Every project is different — but understanding the variables helps you plan with confidence before you speak to anyone.
We price every project individually — these are realistic ranges, not fixed quotes.
Build costs in Glasgow and central Scotland typically range between £2,000 and £3,000 per m² depending on the type, complexity and specification of the extension. Here's how that breaks down by extension type.
The most common extension type. A 20–30m² single storey rear extension in Glasgow. Price depends heavily on specification — standard finish vs high spec with bifolds, underfloor heating and stone worktops.
More space for your spend — the cost per m² of the upper floor is lower than the ground floor as foundations and roof are already being built. Popular for adding a bedroom and bathroom above a new kitchen-diner.
Kitchen extensions cost more than standard extensions because of the fit-out — new kitchen, plumbing, electrics and often structural alterations to open up the existing space. Specification makes a huge difference here.
Generally the most cost-effective way to add space — the structure is already there. Cost depends on insulation, heating, electrics and the level of finish required.
Popular for adding a bedroom without losing garden space. Price varies significantly depending on the roof structure, whether a dormer is required, and the level of finish including en-suite.
Self build costs in Scotland typically range between £2,000 and £2,750+ per m² of gross internal floor area — covering build only, before land, professional fees and VAT. A 150m² home would typically cost between £300,000 and £415,000 to build, depending on specification, site complexity and how the project is managed.
Good quality finish throughout — solid build with standard kitchen, bathrooms and finishes. The most common specification for self builders focused on value and liveability over luxury.
Higher spec finishes — better kitchen, upgraded bathrooms, underfloor heating, aluminium windows and higher insulation standards. This is where most of our clients land.
Complex designs, premium materials, high-spec glazing, bespoke joinery and top-tier finishes throughout. No ceiling on cost at this level — specification drives everything.
Plot cost varies enormously by location. In and around Glasgow, expect to pay £80,000–£200,000+ for a serviced plot with planning permission.
Architect, structural engineer, building warrant, planning and project management fees. Budget 12–18% of build cost for professional fees and compliance.
New build self builds are zero-rated for VAT on labour. You can reclaim VAT on materials under HMRC's DIY Housebuilder scheme at the end of the project.
The figures above are realistic starting points — but your specific project could sit anywhere within those ranges or outside them. Here's why, and what determines where your project lands.
Standard laminate flooring and basic fittings vs solid oak flooring, stone tiles and bespoke cabinetry. Specification is the single biggest variable in what your extension costs to fit out.
Opening up walls into the existing property, removing chimney breasts, installing steel beams — structural alterations add significant cost that a simple per-m² figure won't capture.
Ground conditions, access restrictions, proximity to boundaries and drainage runs all affect cost. A straightforward site costs less than a restricted one — and you can't know until it's assessed.
Build cost is just the start. Architect fees (typically £3,000–£9,000), structural engineer, building warrant, planning fees and VAT all add to the total. A realistic budget accounts for all of these.
A simple rectangular extension is straightforward to build. Curved walls, rooflights, bifold doors, lantern roofs and complex junctions with the existing building all add time and cost.
We always recommend holding a 10–15% contingency. Not because we expect to use it — but because unexpected conditions do arise and having contingency in place means decisions get made quickly, not delayed by budget pressure.
Any company that gives you a firm price over the phone without seeing your drawings, assessing your site and understanding your specification is guessing. We don't guess. We review your drawings, visit your site and give you an accurate, fixed price for your specific project — so there are no surprises when work starts.
Apply to Work With Us →Our project management fee sits on top of your build cost. Here's how it works — transparently, with no hidden extras.
Ideal if you need support for a specific phase. You stay hands-on and only pay for the days we're actively working on your project.
We manage everything from start to handover. Monthly payments mean no large upfront fee — transparent costs aligned to your project progress.
Self build costs in Scotland typically range between £2,000 and £2,750+ per m² of gross internal floor area — covering build only, before land, professional fees and VAT. A 150m² home typically costs between £300,000 and £415,000 to build.
Good quality finish throughout. Standard kitchen, bathrooms and finishes. Most common for self builders focused on value and liveability.
Better kitchen, upgraded bathrooms, underfloor heating, aluminium windows and higher insulation standards. Where most of our clients land.
Complex designs, premium materials, high-spec glazing and bespoke joinery. No ceiling — specification drives everything at this level.
Plot cost varies by location. In and around Glasgow, expect £80,000–£200,000+ for a serviced plot with planning permission.
Architect, structural engineer, building warrant, planning and project management fees. Budget 12–18% of build cost.
New build self builds are zero-rated for VAT on labour. Materials VAT can be reclaimed under HMRC's DIY Housebuilder scheme.
The ranges on this page are a realistic starting point — but your project will have its own variables. For an accurate cost plan specific to your build, we can arrange a bespoke pricing exercise carried out by a qualified quantity surveyor.
A qualified quantity surveyor will review your architect's drawings and produce a detailed elemental cost plan — breaking your build down trade by trade so you know exactly what each element costs before a contractor is appointed.
Most people go to tender without a cost plan and end up with contractor quotes they can't evaluate. A QS cost plan gives you an independent benchmark so you know whether the quotes you're getting are fair — and where to push back.