Bathroom Renovation Budget Planner: Line by Line

Before you get into individual line items, settle on a realistic total for the size and standard of bathroom you want, using local price guides or a couple of visiting quotes as a reality check. Once you have that figure, the next step is splitting it across the main categories of spend rather than treating it as one pot, because that's where most budgeting mistakes happen.

A sensible starting split for a mid-range renovation is roughly: 35 to 40% on labour (plumbing, electrics, tiling and fitting), 25 to 30% on sanitaryware and the shower, 15 to 20% on tiles and tiling materials, and 10% on incidentals such as waste removal, decorating and small fixtures like taps and towel rails. The remaining amount, ideally 10%, should sit untouched as contingency.

Labour is almost always the largest single category and it's also the one where cutting corners causes the most long-term problems. This covers strip-out and waste removal, plumbing first and second fix, electrical work to current regulations, tiling, and final fitting of the suite and fixtures. It's tempting to see labour as the place to negotiate hardest, but a lower labour price is very often a sign of unqualified electrical work, no proper waterproofing behind tiles, or corners cut on waste pipe falls that lead to slow drainage.

When budgeting labour, ask for it itemised by trade rather than as one figure, so you can see roughly how many days of plumbing, electrical and tiling work are being priced in. This also makes it much easier to compare quotes from different firms fairly.

This category covers the WC, basin, bath if you're keeping one, shower enclosure or screen, taps, and any heated towel rail. It's the part of the budget with the widest genuine price range, since a basic WC and basin might cost £250 combined while a designer suite could run to several thousand pounds for the same basic function.

A sensible approach is to decide where you actually want to spend, typically the shower, since it's used daily and hardest to upgrade later without major disruption, and where you're happy with mid-range, typically the WC and basin, which do the same job at £150 as they do at £600 in most everyday use.

Tile cost varies enormously, from around £15 per square metre for basic ceramic to £100 or more for premium large-format porcelain or natural stone. Beyond the tiles themselves, budget for adhesive, grout, tanking or waterproof membrane behind the tiles, and trims, all of which are easy to forget when you're focused on the tile price alone.

A useful rule of thumb is to add 10% to your calculated tile area for cuts and wastage, and always order slightly more than the minimum, since dye lots can vary between batches and running out mid-job to find an exact colour match is often impossible.

A 10% contingency should be treated as untouchable until something unexpected actually happens, not folded into the main budget as extra spending money for nicer tiles. In our experience, roughly one job in five uncovers something once the old bathroom is stripped out, commonly rotten flooring, an ageing waste pipe, or wiring that doesn't meet current standards, and having that contingency ready avoids a stressful scramble for extra funds mid-project.

Staged payments protect both sides of the job. A typical structure is a deposit of 10 to 25% on booking to secure the date and order long-lead materials, a payment when materials arrive on site, and the balance on completion once you're satisfied with the finished work. Be wary of any arrangement asking for the full amount upfront, and equally be realistic that no reputable tradesperson will do the whole job on the promise of payment only at the very end without at least a booking deposit.

The most common overspend we see is changing your mind on tiles or fittings partway through, after ordering, which usually means paying for the first set as well as the replacement. Deciding on your full spec, including tile choice, before work starts avoids this almost entirely.

The second common blowout is underestimating electrical work, particularly when adding features like additional lighting or moving a shaver socket, which can require more rewiring than expected. The third is assuming existing pipework will be reusable when it turns out to be too old or in the wrong position, which is exactly what the contingency fund is there to cover.

If you're putting a budget together and want a sense check from people who actually price and fit bathrooms across Gloucester, Cheltenham, Stroud, Tewkesbury, Newent and the Forest of Dean every week, we're happy to visit and talk through your plans with no obligation. We handle plumbing, tiling and fitting entirely in house, so the written quote we give you reflects the whole job under one roof, not a string of subcontractors adding their own margins.

Call 07927 593 585 or get in touch through our contact page to arrange a visit and start building a realistic, workable budget for your renovation.