ePrivacy and GPDR Cookie Consent by Cookie Consent 5 things you need to know about house extension and timings

5 things you need to know about house extension and timings

3 min read
Feb '26 • by Heather

Quick summary

House extensions usually take at least nine months from start to finish, but this can extend if planning permission or party wall agreements are needed. Summer months are quickest for building, while winter offers better deals. Expect additional two months if neighbours require a party wall agreement, and using private inspectors can save weeks but may cost more.

We’ve worked with a lot of homeowners - over 2000, in fact - and if there’s one thing that shocks people the most about remodelling it’s the time it takes.

If you’re getting ready for either an extension or conversion, you should make note of these important time considerations…

On average, it takes at least 9 months from start to finish

If you’re looking to expand an everyday home, you’ll need to factor in…

  • Finding the right professionals
  • Measuring up your home
  • Designing your new space
  • Planning
  • Building regulations
  • Party wall matters
  • Plus construction