Hidden costs homeowners don't expect
Subfloors, electrics, tanking, skips — the extras that can add thousands to your renovation.
At a glance
Quick Checklist
Key points at a glance
- 1Budget 10-15% contingency minimum
- 2Ask what's included AND excluded
- 3Check if skip hire is in the quote
- 4Confirm electrical certification costs
- 5Ask about floor preparation
- 6Understand tanking/waterproofing scope
Questions to ask your installer
Take these to your next conversation with your fitter
- 1What's included in this quote and what's excluded?
- 2What typically gets discovered during strip-out?
- 3Is skip hire included or separate?
- 4Who handles the electrics and is certification included?
- 5What floor preparation do you anticipate?
- 6How do we handle costs if hidden problems are found?
💡 Tip: A good installer will welcome these questions. If they dismiss them, that's a red flag.
💡Myth vs Reality
Common Myth
"A fixed quote means no extras"
The Reality
Most quotes exclude work that can't be assessed until strip-out. Honest installers will explain their approach to discoveries.
Common Myth
"Skip hire is trivial"
The Reality
A 6-yard skip for 2 weeks can cost £300-400+. A full bathroom generates significant waste.
Common Myth
"Electrics are included"
The Reality
Often separate. Ask specifically about Part P certification and who provides it.
What to look for
- •Clear breakdown of what's included in the labour price
- •Explicit mention of exclusions (not just silence on the topic)
- •Contingency allowance for hidden problems
- •Electrical certification costs (can be £300+ if subcontracted)
Common mistakes
- •Assuming 'bathroom renovation' means everything is included
- •Not asking about floor preparation or levelling
- •Forgetting about skip hire and waste disposal costs
- •Underestimating tiling costs for complex patterns or large format tiles
- •Not budgeting for redecoration of adjacent areas
Quality considerations
- •A detailed quote protects both you and the installer
- •Cheaper quotes often exclude work that more expensive quotes include
- •Experienced installers can usually predict hidden issues
- •Transparency on costs builds trust throughout the project
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This guide is written to help you make informed decisions, not to sell you anything. Always discuss your specific situation with a qualified installer.