Are you considering building your dream home but unsure about the costs involved? Our Self Build Cost Calculator is designed to give you a reliable, UK-based estimate for your new home project. At dRAW Architecture, we’ve worked with countless homeowners and developers to guide them from concept to completion, and we know that budgeting is often the first and most critical step.
This tool was developed with UK-specific cost data (updated for 2025) and includes various factors like build quality, location, contingency allowances, and total square footage. It not only gives you a breakdown of potential costs but also includes visual insights and tailored recommendations to help you make informed decisions.
Whether you're a first-time self-builder, seasoned investor, or simply curious, our calculator is a valuable tool to estimate your cost to build a house in the UK, instantly.
Our self-build cost estimator UK tool is intuitive and designed for all users, regardless of architectural or construction experience. Here’s a simple walkthrough to help you use the tool effectively:
Once you hit “Calculate”, the calculator will display a detailed cost breakdown, charts, expert recommendations, and even a disclaimer for transparency. The tool is powered by the latest market data from RICS, construction indices, and our in-house experience at dRAW Architecture.
Below is your interactive tool to estimate your new build house costs based on your inputs. This calculator is accurate for self-builds, custom homes, and new residential developments in the UK for 2025.
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💡 Tip: Bookmark this page or share it with your designer or builder to ensure everyone is aligned on the budget.
Once you’ve used the tool, don’t forget to book a free consultation with our team of architects and project planners at dRAW Architecture to refine your ideas and optimise your project for maximum value.
Once you calculate your build cost, you'll receive a detailed cost breakdown including:
Cost Component
Description
Example (120m², Standard Quality, London)
Base Build Cost
Construction cost per square metre × total area
£2,800 × 120m² × 1.2 = £403,200
Contingency
10–15% of total build cost
£40,320 (10%)
Total Estimated Cost
Base + Contingency
£443,520
These numbers are also visually presented in:
These insights help you understand where your budget goes and allow you to plan for materials, contractors, finishes, and hidden costs ahead of time. No more guessing, just informed planning.
At dRAW Architecture, we don’t just estimate, we advise. Based on your selections, the calculator provides tailored suggestions, such as:
Our team offers planning support, full architectural design, and turnkey solutions, making us your ideal partner for any self build UK project. We’ve worked extensively across Greater London, the Home Counties, and urban infill sites, so we understand what it takes to build successfully in complex locations.
Understanding Self Build Costs in the UK (2025)
The average cost to build a house in the UK in 2025 ranges from £2,200 to £3,500 per square metre, depending on the level of quality and complexity. Here's a general guide:
Quality
Cost per m² (UK Average)
Basic
£2,200 – £2,500
Standard
£2,600 – £3,000
High-End
£3,100 – £3,800+
Factors affecting build costs:
Our self build budget planning tool helps you predict costs more reliably by integrating all these variables. Want to go deeper? Read our guide to UK house build costs in 2025.
Why use an online calculator instead of guessing or waiting for contractor quotes?
This is not just a house build cost calculator; it’s a strategic planning tool created by a professional architectural firm. DRAW Architecture is here to turn your dream into a detailed, costed plan, whether you're building a one-off home, small development, or eco-home.
How accurate is this self build cost calculator?
The calculator uses current 2025 UK rates. It offers a strong estimate but doesn’t replace a full feasibility study or architectural quote.
What’s included in the cost estimate?
Build costs only: materials, labour, basic finishes, and contingency. Excludes land, planning fees, and professional fees (unless discussed in consultation).
Can I use this for extensions or renovations?
This version is designed for new builds. For extensions, contact dRAW Architecture for a bespoke estimate.
How much does it cost to build a house in the UK in 2025?
Anywhere from £2,200–£3,800/m² depending on spec and location.
Is land cost included?
No. This is purely the construction/build cost. Land prices vary significantly by region.
Planning your dream home doesn’t have to start with spreadsheets. Use our calculator, then book a free, no-pressure consultation with the architectural team at dRAW Architecture. We can:
👉 Book Your Free Consultation
Our experienced architects and planners serve clients across London, the South East, and beyond, turning ideas into award-winning homes.
The Self Build Cost Calculator is intended as a planning tool and provides approximate cost estimates based on general construction rates. Costs will vary based on actual site conditions, planning complexity, finishes, market volatility, and other unique factors. For a tailored, project-specific quote, we strongly recommend speaking with our architects.