Homeowners risk renovation cost shock as bathroom expectations fall far below reality, FMB warns

By Danny BallPublished On: April 16th, 2026Categories: Top Stories

Homeowners planning bathroom renovations are being warned over a significant gap between expectations and real-world costs, following new research from the Federation of Master Builders (FMB).

The study found that 71% of homeowners expect a bathroom renovation to cost under £10,000, despite professional builders highlighting that complex labour, fittings, plumbing challenges and hidden structural issues often push final costs significantly higher.

A further breakdown of expectations shows:

26% believe a full bathroom renovation can be completed for under £5,000
14% expect costs between £10,000 and £15,000
Only 3% anticipate spending more than £15,000

The research also highlights confusion around what drives renovation costs, with 38% correctly identifying labour as the most expensive element. However, many homeowners still overestimate the importance of fittings (17%) and plumbing (16%), while a significant proportion are unsure where their budget is actually allocated.

Timeline expectations also diverge from typical construction programmes:

19% expect completion in one week or less
39% expect completion within two weeks

Industry professionals say these timeframes are often unrealistic for full bathroom renovations involving strip-out works, drying time and coordination of multiple trades.

Brian Berry, Chief Executive of the Federation of Master Builders, said: “Bathroom renovations are one of the most common home improvement projects, but our research shows homeowners are walking into them with unrealistic expectations about both costs and timelines. The gap between what people think they’ll pay and what they actually need to budget is setting them up for disappointment – or worse, pushing them towards rogue traders offering unrealistic quotes and timelines.

“When someone thinks a full bathroom can be done for £3,000 in five days, they’re prime targets for cowboys who will take a deposit, do substandard work and disappear. Most homeowners are budgeting for the bathroom they imagine, not the bathroom they’ll actually get. Labour alone can swallow half the budget before a single tile goes up.”

Case study highlights impact of poor workmanship

One homeowner who contacted the FMB following a failed renovation described the impact of poor-quality work: “I don’t take baths anymore. It’s hard to relax when you look around your bathroom and see thousands of pounds you’ve wasted. Our quote came in at under half the price of installers from the retailer we bought materials from and we thought we’d get a bargain. Instead, we were left with uneven tiles, squiggly sealant, damaged fixtures including our toilet, and a radiator that doesn’t work. Eventually the whole thing will need to be stripped out and replaced. Everyone needs to start somewhere but as a consumer you shouldn’t be paying for someone to learn on your property.”

FMB London President and Director of FMB member companies AMIC Ltd and Nest Building Group said: “We see this expectation gap every week. Clients come to us thinking a bathroom renovation will cost £6,000 and be done in five days, and we have to walk them through the reality. Quality work takes time – you’re coordinating plumbers, electricians, tilers, sometimes structural work. Rushing it is how you end up with leaking showers and cracked tiles six months down the line.

“The internet has made everyone think they’re an expert after watching a few YouTube videos or ordering tiles online based on how they look in a photo. But bathrooms are technical environments – you need proper waterproofing, the right substrate preparation, tiles that can handle moisture and temperature changes. That’s why we work closely with Village Ceramics in Oxshott. They offer specialist technical advice you simply can’t get from scrolling online.

“They understand how different tiles perform in wet environments, what adhesives and grouts to use for specific applications, and how to avoid the problems that only show up months later. Going to real experts who can see your space and ask the right questions – that’s the difference between a bathroom that lasts and one that fails.”

FMB renews push for licensing scheme

The findings come as the FMB continues its campaign for a statutory licensing scheme aimed at improving consumer protection in the construction and home improvement sector.

According to the organisation, homeowners in the UK have lost an estimated £14.3 billion to rogue traders over the past five years, highlighting ongoing concerns around regulation and standards in domestic construction work.