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What kind of survey do I need for my house extension?

4 min read
Oct '25 • by Heather

Quick summary

For your house extension, you typically need a measured survey which costs around £2000 if using laser technology, taking about 90 minutes, and is more detailed than manual surveys. If your land involves complex terrain or construction plans, a topographic survey might be necessary but usually isn’t for standard extensions. Always consult an expert for tailored advice.

Surveys don’t get talked about nearly enough. As one of the first steps on your renovation journey, they provide the foundation for all the work that follows. Yet, when it comes to surveying a property, many homeowners can feel left in the dark. What kind of survey do you need? Is a topographic survey necessary? And what’s all this talk of lasers?

To help illuminate your options, here’s a handy guide to surveys and what’s going to be the best option for your project…

Why a measured survey is important

A measured survey is essentially the foundation for your whole project, providing all the key details you’ll need during the design process and beyond.

Through the course of the process, your surveyor will map out the layout of your property and calculate the dimensions, this information can then be turned into your existing drawings.

How much does an architect charge?