Building Project Price Guide

If you’re about to undertake a building project, it’s important to know how much you’re likely to spend. That way you can plan your project and keep control of your spending. We’ve come up with a handy building project price guide to give you a vague idea of how much the work you want to do is likely to cost.

General advice

Research carefully

What are you trying to achieve with your building project? Do you want to build an extension on your property to make more space? Or are you planning on converting a space you already have, like a loft or garage, into additional living space? Do you have an idea of what you want your new space to look like?

Once you have a rough idea of what you want, you can start researching to find out how much it’s likely to cost.

Come up with a budget

After you’ve worked out what your project will look like, you should come up with a budget. This needs to be realistic, so you know you can afford the building work and don’t run out of money halfway through.


How much a building project costs depends on what you want to do. To get a precise price for your building project, you should get several quotes. But to give you an approximate idea, here’s a general building project price guide:

Type of building project Approx. cost
Garage conversion From £9000
Loft conversion From £900 per square metre
Orangery From £10000
Flat roof extension From £1200 per square metre

Ensure you get quotes from several companies so you can work out an average price for your building project. Remember that the size of your project and the materials you want to use can make an impact on the price, so it’s worth getting these detailed in any quotes you get.

This building project price guide should have given you an idea of how much a typical building project is likely to cost. To find builders to give you a quote, put your details into our online form. We’ll connect you with up to 4 local professionals.