Step 1 of 5 - Your Self-Build Project

  • For general build cost advice check out our beginner’s guide to self-build costs, or get a detailed estimate for your project by using our in-depth Build Cost Calculator:

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  • A typical loft will offer around 60% of the floorspace of a standard storey

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Step 2 of 5 - Materials & Design Choices

  • The structural system is the construction method that will form the core shell of your home. For more advice see our beginner’s guide to building systems

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  • Dormers are special windows that jut out from the main roof, creating more headroom inside a loft. Find out more about dormer windows

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Step 3 of 5 - Interior Fit-out & External Works

  • Please enter the total number of bathrooms you will need. A single downstairs WC has already been included in the calculations.

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Step 4 of 5 - Building Route

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About Build It’s Self Build Cost Calculator

Build It’s Self Build Cost Calculator is a free interactive tool intended as an indicative ready-reckoner to help determine ballpark self build costs.

The new build house calculator is based on average rates collated and regularly updated by the Build It Estimating Service. It should not be used as a substitute for project-specific professional budgeting advice.

The house build costs per m2 shown in the results table relate to gross internal floor area (GIA), which is the amount of usable living space across all storeys of the main house (excluding any external garages). GIA is the industry-standard measure of house size used by most professionals and estate agents.

It’s important to note that builders and trades may refer back to gross external floor area when providing quotes. For more on this read our guide to self build routes and costs.

We have invited you to input your own costs for the kitchen, sanitaryware and external landscaping, as prices for these elements will vary widely depending on the quality and specification you prefer. Other general fittings, plastering and decoration are included in the calculations.

The main exclusions are costs for finance, professional fees, planning and Building Regulations, insurances and connections to services.

VAT is zero-rated for new build homes, so the prices shown here exclude VAT. Read our guide to claiming back VAT on a self build project for more advice.

You can get a detailed bespoke estimate for your project using the Build It Estimating Service, which enables you to calculate your self build costs right down to the last roof tile.

Disclaimer: The information contained in the Self Build Cost Calculator is intended solely for the purpose of providing general information, and is not intended to amount to advice on which reliance should be placed. Please see our full terms & conditions for more details.

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