We've asked industry experts with years of experience in the business, as well as homeowners who've had conversions, to share their insider tips guaranteed to help your build run smoothly.
Even a small amount of online research into loft conversions will uncover hundreds of horror stories - from escalating costs to timescales going out the window - that could threaten to put you off altogether.
That's why we've spoken to industry experts to get insider tips on what to expect, how to avoid falling victim to common mistakes and how to help your conversion run smoothly.
We've also asked homeowners who've had a loft extension to tell us what they wish they'd known before they started, and what advice they'd give to anyone embarking on a conversion.
Which? members can now to uncover our insider tips and watch our two homeowner loft conversion videos. Logging in will also give you access to our costs page, where we talk you through how to keep control of loft conversion costs and make savings.