House Addition Budget: Practical Tips to Keep Costs Under Control
If you’re thinking about adding a room, loft, or garden office, the first question is always – how much will it cost? A solid budget helps you avoid surprises, keep the project moving, and stop you from cutting corners that could cost more later. Below you’ll find a straightforward road‑map you can start using today.
Know Your Costs Before You Start
Start with a simple list of everything you need: design work, planning permission (if required), ground works, structure, utilities, finishes, and contingency. In the UK most small extensions fall under Permitted Development, but you still need to budget for a structural engineer and a surveyor. Grab a few quotes from local builders – even a rough estimate will show you where the big numbers sit.
Don’t forget hidden costs. For example, connecting to existing heating or electrical systems often adds 10‑15% to the price. If you’re extending near a boundary, you might need a party wall agreement, which can add legal fees. And always set aside a 10‑20% contingency fund for unexpected surprises, like uncovering rotten timber or dealing with damp.
Smart Ways to Trim the Budget
One of the easiest ways to save is to do part of the work yourself. Tasks like demolition, painting, or fitting off‑the‑shelf kitchen units can be tackled with basic DIY skills. Just be honest about what you can handle – a poorly fitted roof will cost you more in the long run.
Choosing standard sizes for doors, windows, and panels can shave off a lot of money. Custom sizes mean more labor and higher material costs. Look for suppliers offering bulk discounts or off‑season sales; many manufacturers lower prices in autumn when demand drops.
Consider alternative building methods. Prefabricated ‘kit’ extensions often come cheaper than a fully bespoke build because they’re manufactured in a factory and assembled on‑site quickly. The reduced build time also means lower labour costs.
Finally, keep an eye on your timeline. Delays can quickly balloon costs through extra site fees, storage charges, and extended contractor wages. Talk to your builder about a realistic schedule and stick to it as closely as possible.
Once you have your numbers, put them into a simple spreadsheet. List each item, the estimated cost, and a column for actual spend. Update it weekly – this habit helps you spot overruns early and make adjustments before they become a problem.
Remember, a well‑planned budget doesn’t mean you have to skimp on quality. It just means you’re making informed choices and avoiding hidden expenses that can derail the project. With these tips, your house addition can stay on track, look great, and add real value to your home.
