DATA-BACKED GUIDE · UPDATED JULY 2026
House renovation cost UK: how to budget a full renovation
A full house renovation covers everything from rewiring and a new roof to kitchens, bathrooms and decorating, which is why the total can feel hard to pin down. The trick is to budget in stages and keep a contingency, because older homes always hide a few surprises once walls and floors come up. The real prices below come from genuine jobs across the UK, so you can build a room-by-room budget on real numbers rather than guesswork or a single contractor's opening quote.
The quick version
- Renovation costs are best built room by room and trade by trade, then added up, rather than guessed as one lump sum.
- The hidden work, rewiring, replumbing, roofing and damp treatment, often costs more than the visible finishes and is easy to underestimate when you first walk round a house.
- Set aside a contingency of at least ten percent, because older properties reliably throw up problems once walls and floors are opened up.
- Structural changes and any extension may need building regulations sign-off, and some work needs planning permission separately, so factor both into the schedule before booking trades.
- Two houses of the same size can land on very different totals depending on how many bathrooms are involved, whether the kitchen moves, and the finish you choose.
- The order you tackle work in matters almost as much as what you spend: fix the fabric of the building, wiring, roof, damp, before you spend on finishes that could get damaged later.
What people actually paid
Real prices, in people's own words
- £70,000“So far we have spent nearly £70k on: Roof replacement £25k. Asbestos removal £4k...”
- £170,000“Extension, bit of landscaping, loft and full refurb just cost us about £170ish.”
- £200,000“Friend did similar last year for just over 200k and A LOT of time spent”
- £450,000“It's cost us the best part of £450k.”
Genuine amounts posted publicly. We publish the price and the quote, never the person.
Why the price varies so much
The age and condition of the house drive most of the difference. A tired but structurally sound home mainly needs cosmetic work, while a neglected property may need a full rewire, new plumbing, roof repairs and damp treatment before you even reach the parts you actually chose, the kitchen, the bathrooms, the paint. The number of bathrooms and the kitchen spec are big swings on their own, and moving walls or adding an extension adds a further layer of design, structural work and building control sign-off. Most renovation work is carried out by local independent tradespeople or small building firms rather than large national contractors, so the price you get often reflects one person's or one firm's workload and overheads as much as the job itself. Where you live changes labour rates too, with jobs generally costing more in and around the bigger cities than elsewhere in the country. On top of all that, the quality of finish you choose, from budget materials to a high-end specification, can move the figure a long way on a house that is otherwise identical in size. That combination, condition, layout changes, location and finish, is why two renovations of the same square footage can land so far apart.
How to pay less
- Prioritise the structural and hidden work first, wiring, roof and damp, then spread the cosmetic finishes over time as budget allows rather than trying to do everything at once.
- Get separate quotes for the big trades rather than handing everything to one contractor, and compare them against the real prices below so you know if a number is out of line.
- Keep plumbing and the kitchen in their existing positions where you can, since moving services under floors and through walls is one of the costliest changes on any renovation.
- Buy fittings, tiles and paint yourself in sales rather than paying a supply markup, and agree a fixed price for labour up front so extras get discussed before they happen, not billed after.
- Sequence the work so trades do not undo each other's jobs: finish first-fix electrics and plumbing before plastering, and plaster before flooring.
- Ask each tradesperson for a written scope of what is and is not included, so a cheap quote does not turn into a run of add-on costs once the job starts.
Common questions
How do I budget for a full house renovation?
Break it down room by room and trade by trade, price each part against the real prices below, then add a contingency of at least ten percent for the surprises older homes always hide once work starts. That gives you a working budget you can defend to a lender or a partner, rather than a single hopeful number picked out of the air.
What usually blows a renovation budget?
The hidden work does it: a rewire, damp treatment, roof repairs or rotten joists found once floors and walls come up. These are hard to see when you buy the house but need fixing before anything else, so build them into the plan and the contingency before spending on kitchens and decorating. Changing your mind on spec halfway through is the other common cause.
Do I need permissions for a renovation?
Cosmetic work usually does not, but structural changes, an extension or a loft conversion often need building regulations sign-off, and some also need planning permission. Planning and building regulations are separate approvals with different rules, so check both early, ideally before you book any trades, since waiting on a decision can hold up the whole schedule.
Should I use one main contractor or hire trades separately?
A main contractor costs more but takes on the coordination and the risk if something goes wrong, which suits a full renovation with several trades running at once. Hiring trades directly can save money if you have the time to manage the sequence and the site yourself, but the coordination risk then sits with you.
How much should I keep back as contingency?
At least ten percent of the total budget is a sensible minimum on any renovation, and older or previously unrenovated homes often warrant more once floors, walls and roofs are opened up. Keep it as a genuinely separate pot rather than folding it into the main budget, so it is still there when a real problem turns up rather than already spent on upgraded finishes.
Is it cheaper to renovate in stages or all at once?
Doing it all at once usually costs less overall, since trades are not remobilising and you avoid living through the disruption twice. Staging the work makes sense mainly when it is the only way to fund it, in which case fix the hidden and structural work first and leave the cosmetic finishes for a later phase.