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Builder Cost Calculator UK

Estimate the 2026 cost of your building project — by job type, finish level and where you are in the UK. Instant result, no email needed.

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2026 labour + materials pricing

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<a href="https://www.bestbuilders.co.uk/costs/builder-cost-calculator"><img src="https://www.bestbuilders.co.uk/img/infographics/builder-cost-calculator.svg" alt="Builder costs in the UK (2026) - BestBuilders" width="720" style="max-width:100%;height:auto"></a><p>Source: <a href="https://www.bestbuilders.co.uk/costs/builder-cost-calculator">BestBuilders</a></p>

4 steps. Labour + materials, excluding VAT. Always get three like-for-like written quotes before you commit.

Methodology

How This Calculator Works

We combine project type with finish level, then apply a regional labour multiplier from our regional labour index.

Project + finish level (labour + materials)

Small repairs — £1,800 base
Single room refurb — £7,500 base
Kitchen/bathroom (build work) — £6,500 base
Structural knock-through — £7,000 base (incl. steel)
Single-storey extension — £34,000 base · Loft/garage conversion — £24,000 base
Whole-house renovation — £55,000 base
Standard ×1.00 · High-end ×1.40 · Premium ×1.90

Labour + materials excluding VAT. Builder day rate typically £150–£250 (£100–£150 for a labourer); most turnover-above-£90k builders add 20% VAT.

Regional Multipliers

London 1.28× · South East 1.14× · South West 1.05×
East of England 1.08× · Midlands 1.00× (baseline)
North West 0.93× · North / Yorkshire 0.92×
Wales 0.94× · Scotland 0.96× · NI 0.88×

Low/high band is ±20% around the mid estimate. A firm price follows a site survey.

Typical Builder Costs by Project (2026)

Labour + materials (excl. VAT) by project, Midlands baseline (±20% band).

Project	Typical 2026 cost	Notes
Small repairs / odd jobs	£800–£3,000	A few days on site
Single room refurbishment	£4,500–£12,000	1–2 weeks
Structural knock-through (incl. steel)	£1,800–£4,000	Wall + steel + calcs
Single-storey extension (build)	£28,000–£45,000+	8–14 weeks
Whole-house renovation	£40,000–£120,000+	Highly variable

These figures power the calculator above — enter your own spec for a tailored estimate. For the full breakdown, read our complete cost guide.

What drives the cost of a building project

On a building job the base cost is really just the starting point, because the same project can double depending on scope and finish. A single-room refurbishment done to a standard spec is one number; take it to a high-end or premium finish — better joinery, tiling, glazing and fittings — and the labour and materials climb steeply, which is why the calculator applies a finish multiplier. Structural work is its own line: knocking through, underpinning or adding steel brings in a structural engineer and building control, and older properties routinely hide problems — poor foundations, dated wiring, damp or rot — that only surface once work starts.

That is why a sensible quote carries a contingency, and why the professional fees around the build matter as much as the build itself. Design and drawings, a structural engineer, planning and building-control fees and any party-wall agreement usually sit outside the builder’s price, so check them separately. VAT applies once a builder’s turnover passes the £90,000 threshold, though some work — a new build, or a home empty for over two years — can qualify for a reduced or zero rate. Labour rates also run well above the Midlands baseline in London and the South East. Our builder cost guide shows what a fair 2026 quote looks like line by line, the house renovation cost guide covers whole-property projects, and you can compare local builders through our find a builder hub.

Frequently Asked Questions

How much does a builder cost per day in 2026?

A skilled builder or tradesperson typically charges £150–£250 a day in 2026, with a labourer £100–£150 a day. London and the South East run 20–40% higher. For anything beyond a few days most people ask for a fixed-price quote rather than paying a day rate.

Do builders charge a day rate or a fixed price?

Both. Small, hard-to-scope jobs are often day rate (£150–£250 per tradesperson). Larger, well-defined projects are usually a fixed-price quote, or occasionally cost-plus (materials and labour plus a 10–20% margin). A fixed price gives you the most cost certainty.

How much does a builder cost for a full house renovation?

A full renovation typically runs £40,000–£120,000+, or roughly £1,000–£1,500 per m² for a light refurbishment and £2,000–£3,000 per m² for a full one. The final figure depends heavily on the property's size, condition and your finish level.

What is included in a builder's price?

A proper quote covers labour, materials, plant and scaffold, and waste removal, plus making good. It usually excludes design/architect fees, planning and building-control fees, a structural engineer and party-wall costs — check these separately so you compare like for like.

Does a builder charge VAT?

A builder with turnover above £90,000 must charge 20% VAT, so always check whether a quote is VAT-inclusive. Some works — a new build, or renovating a home empty for over two years — can qualify for a 0% or reduced 5% VAT rate.

How accurate is this builder cost calculator?

It gives a guide from 2026 UK labour and project rates, not a fixed quote. Your real cost depends on the exact scope, materials chosen, site access, the property's age and condition and how many trades are involved. A builder confirms the price after a site visit and detailed specification, which can move the figure up or down.

What does the builder estimate include and exclude?

The figure typically covers labour and standard materials for the work described, with VAT where the builder is registered. It usually excludes design and drawings, structural engineering, skip hire and waste removal, scaffolding, temporary works, and finishing trades like decorating unless specified. A written quote itemises exactly what is and is not included.

Why might a builder quote differ from the calculator?

The calculator assumes a standard job with reasonable access. On site, a builder may adjust for hidden defects, awkward access, poor existing foundations or wiring, spec upgrades and provisional sums. Contingency for unknowns is normal on older homes, and London labour rates run higher, so use the estimate to budget before gathering firm quotes.

How much deposit should I pay a builder?

Never pay for the whole job up front. For a small job you should not need to pay a deposit at all; for a larger project a fair arrangement is a modest deposit to cover initial materials, then stage payments tied to completed milestones, with a final 5% retention held back for a few weeks after completion to cover any snagging. Walk away from any builder who demands a large cash sum before work starts, and pay by bank transfer or card so there is a record.

How do I compare builder quotes fairly?

Give every builder the same written scope so you are comparing like for like, then get at least three itemised quotes rather than one headline figure. Check what each excludes — VAT, skip hire and waste, scaffolding, making good and finishing trades are the usual gaps — and be wary of any quote that comes in far below the rest, as it often signals missing items that reappear later as extras. Our builder cost guide shows what a fair 2026 quote looks like line by line.

Do I need planning permission and building control for building work?

They are two different things, and many jobs need building control even when they do not need planning permission. Lots of home improvements — many single-storey rear extensions, loft conversions and internal alterations — fall under permitted development and need no planning application, but listed buildings, conservation areas and anything beyond the permitted limits do. Building control is separate: structural work, new drainage, electrics and extensions almost always need it, either through your council or an approved inspector, and it is signed off with a completion certificate you will want when you sell. Confirm who is arranging each — you, your builder or an architect — before work starts, and factor the fees in, as they usually sit outside the builder’s quote.

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Written by the BestBuilders research team from our cost model and published sources. We invite working trades to check our guides – how we check our content · Last updated: 5 September 2026. Estimates reflect 2026 UK supply-and-fit builder prices, modelled as a project base cost adjusted for finish level and region, cross-checked against published cost data. This calculator gives a budgeting estimate, not a quote · See our editorial standards.