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5 pitfalls to avoid when extending your house

3 min read
Oct '25 • by Heather

Quick summary

To avoid common pitfalls when extending your house, set a realistic budget based on your desired size and features, and allow for extra costs like fittings and inflation, which can add thousands. Don't cut corners on essential surveys or hire untrustworthy builders. Always consult neighbours if sharing party walls and consider sustainability to save money long-term.

Extending your home is a big project. Second to actually buying your home, it’s going to be one of the biggest financial commitments you’re likely to make so the last thing you want is to find yourself becoming another home project horror story.

To protect both your home, your finances, and your piece of mind, here are some of the pitfalls you can avoid during your project…

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An unrealistic budget

At Resi, we’re transparent with our fees, so you won’t have any hidden charges eating at your budget. Yet what about the rest of your build?

Being honest about what you see as the end product is the best way to avoid any nasty surprises when it comes to your finances. We’ve known plenty of people who have viewed their kitchen as an afterthought - only to find the fittings they want add an extra £10,000 to the project.

Have you thought about the kind of kitchen you want fitted? What kind of taps you want? As you go forward, you’ll find it’s the little things that quickly add up. Not to mention always changing, as inflation can hit anything from roof tiles to door hinges.

Read more: how much does an extension cost?

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