For websites · Free

Put a UK renovation cost calculator on your website

One line of HTML gives your visitors instant 2026 prices for extensions, loft conversions, kitchens, bathrooms and nine other projects, with regional prices, VAT, fees and a contingency. It's free, needs no account, sets no cookies and we update the prices every quarter.

Who it's for

Architects and designers: answer "what will it cost?" before the first call, and get better-prepared clients.
Builders and trades: let visitors sense-check their budget, then ask you for a proper quote.
Estate agents and mortgage brokers: show buyers what it costs to extend or improve a home.
Property writers and bloggers: add a working tool to your extension, loft and renovation articles.

Get your code

Start on

Default region

Paste this where you want the calculator

<iframe id="estiquote-calculator" src="https://estiquote.co.uk/embed/?p=extension" title="Renovation cost calculator by Estiquote" style="width:100%;min-height:980px;border:0" loading="lazy"></iframe>
<p style="font-size:13px">Free <a href="https://estiquote.co.uk/renovation-cost-calculator/">renovation cost calculator</a> by Estiquote</p>
<script>window.addEventListener("message",function(e){if(e.origin==="https://estiquote.co.uk"&&e.data&&e.data.estiquoteHeight){var f=document.getElementById("estiquote-calculator");if(f)f.style.height=e.data.estiquoteHeight+"px"}});</script>

Works in WordPress (Custom HTML block), Squarespace (Code block), Wix (Embed HTML), Webflow and plain HTML. Visitors can still change the project, size, finish and postcode.

Preview

The small print

Free for any website, commercial or not. Please keep the credit line under the calculator.
The figures are planning ranges, not quotes, and we update them every quarter (last reviewed September 2026). Read how we calculate.
No cookies, no tracking, no ads. The calculator only loads its price file from estiquote.co.uk, and postcodes never leave the visitor's browser.
Added it to your site? Tell us at support@estiquote.co.uk and we'll let you know when prices change.