Start With an Honest Number, Not a Wish

Most kitchen renovations in the UK land somewhere between £10,000 and £25,000. A straightforward replacement of units, worktops and appliances in a small room sits at the lower end, while a full redesign involving moved walls, new plumbing and premium fittings will comfortably pass £35,000. Those figures are a starting point for a conversation rather than a quotation, but they matter because they stop you walking into a showroom expecting a £6,000 job when the reality is closer to double that.

Before you look at a single sample door, decide on your absolute maximum — the number you would be uncomfortable spending, but not financially damaged by. Then work backwards. If your ceiling is £18,000, treat £15,000 as your working budget and hold the rest back. Kitchens have a way of absorbing whatever room you give them.

Break the Budget Down Into Its Parts

A single lump sum tells you nothing. A breakdown tells you where you can save and where you cannot. A typical mid-range project splits roughly as follows:

• Kitchen units and carcasses: 25–35% of the total.
• Worktops: 8–15%, depending on whether you choose laminate, solid wood, quartz or granite. Templating and fitting are separate costs with stone.
• Appliances: 10–20%. Ovens, hobs, extractors, fridge-freezers and dishwashers add up quickly.
• Labour — fitting, carpentry and tiling: 25–35%.
• Plumbing and electrics: 8–15%, and more if you are relocating a sink or cooker point.
• Sinks, taps, handles and splashbacks: around 5%.
• Flooring, plastering and decoration: 5–10%.
• Waste removal, skips and deliveries: 2–4%.

Every one of those lines needs a number against it before you commit to anything. If a quote arrives as a single figure, ask for it itemised.

The Contingency Fund Is Not Optional

Set aside between 10 and 15% of your total budget for the unexpected. If your home is older than about 40 years, or if you are knocking through a wall, increase that to 20%. This is not pessimism; it is what turns a stressful project into a manageable one.

On a £16,000 kitchen, a 12% contingency gives you roughly £1,900 to deal with the things nobody can see until the old units come out: rotten floorboards, a wall that is not square, wiring that predates current colour codes, or a waste pipe running exactly where the new base unit needs to go.

If you do not spend it, you have money left for the things you deprioritised. That is a far better outcome than discovering in week three that you cannot afford to finish.

The Costs That Hide in Plain Sight

These are the ones that catch homeowners out most often:

• Making good after trades have left. Plastering, filling and repainting are rarely included in a fitter's price.
• Moving services. Relocating a radiator, boiler, consumer unit or soil pipe is skilled work and rarely cheap.
• Temporary kitchen arrangements. If the work takes four weeks, budget for eating out, a makeshift microwave corner or a takeaway habit.
• Skip permits. You often need permission from your local council to place a skip on the road, and it costs money.
• Building regulations and certification. Electrical work needs signing off, and gas work must be carried out by a registered engineer. Ask who is covering this before work starts.
• VAT. Most quotes from VAT-registered traders include it, but always confirm. A 20% difference on a £15,000 job is £3,000.
• Delivery and access charges. Upper-floor flats, narrow lanes and long carries can all add to the bill.
• Changes after work begins. Almost every variation costs more mid-project than it would have done at the planning stage.

Compare Quotes Like a Professional

Get at least three written quotes, and make sure you are comparing like for like. One trader may be quoting for supply and fit with mid-range units; another may be quoting labour only, with you sourcing the kitchen yourself. Those are not comparable figures.

Look for quotes that list brands, model numbers, unit counts, worktop material and square metres of tiling. Check what is excluded, how long the work will take, and what the payment schedule looks like. A common and sensible arrangement is a deposit of 10–25%, staged payments as the work progresses, and a final retention held back until you are satisfied with the finished room.

Ask for proof of insurance and, where relevant, trade registration for gas and electrical work. A cheap quote from someone who cannot produce these documents is not a bargain — it is a risk you are carrying on your own.

Keeping the Project on Track

Keep a simple spreadsheet with your original budget, the quoted figure and every change as it happens. Review it weekly with whoever is doing the work. Flag any decision that might cost more before it is made, not afterwards.

Pay attention to the small choices that quietly escalate: upgrading handles, adding a wine cooler, choosing a quartz worktop over laminate, deciding the extractor should be ducted rather than recirculating. None of these is unreasonable on its own, but three of them together can wipe out a contingency in an afternoon without anyone noticing.

The most reliable way to avoid hidden costs is to slow down at the beginning. Measure carefully, settle layouts and finishes before work starts, agree in writing what happens if something unexpected is uncovered, and leave the contingency untouched for as long as you possibly can. A kitchen that finishes on budget is rarely the one that was rushed at the planning stage.