A whole-house renovation touches structure, services and finishes in one continuous programme, which makes a vague quote more dangerous here than on any single-trade job. Two builders pricing the same house can be £15,000 apart purely because one has written down what's actually being done and the other hasn't.
A usable specification for a renovation is a room-by-room document, not a paragraph. It should let you compare two quotes and see exactly where they diverge — not just on total price, but on what each price actually buys.
The sequence a renovation spec should follow
Work should be listed in the order it actually happens on site: strip-out and skip, structural openings and RSJs, first-fix electrics and plumbing, insulation upgrades, plastering, second fix, decoration, flooring. A spec that lists trades alphabetically instead of in build order usually means nobody has actually programmed the job.
For a renovation involving structural alterations — removing a chimney breast, opening up a wall — the spec needs to state whether calculations and building control sign-off are included in the price or are a separate provisional sum.
Materials that must be named, not described
'Insulation upgrade' means nothing on its own. The spec should state the insulation type and thickness for each element — loft, floor, walls — and the target U-value where building control approval depends on it. The same applies to plasterboard specification: is it standard, moisture-resistant in bathrooms, or fire-rated where a party wall is involved.
Flooring, sanitaryware and kitchen units are usually where 'or similar' language hides a downgrade. A proper spec names the actual product range and finish, with an allowance figure if the client hasn't chosen yet, rather than leaving it open to the builder's discretion.
Interfaces between trades
Renovations fail at the joins between trades more than within them: who chases walls for new cabling, who makes good after the plumber, who protects finished floors during the second fix. The spec should assign responsibility for making good after each trade explicitly, not leave it as an assumed courtesy.
Where rewiring and re-plumbing run alongside structural work, the spec should state the intended isolation and testing sequence so the electrician isn't working live cables in a space the carpenter is about to board over.
What a cheap renovation quote usually leaves out
Skip and waste removal numbers, VAT treatment, and protection of retained floors and staircases are the three most common omissions. Asbestos survey costs for pre-1999 properties are another — a cheap quote often assumes a clean strip-out and adds the cost back later if anything is found.
Making good to neighbouring finishes after structural openings, and redecoration of rooms disturbed by service runs but not directly worked in, are frequently excluded by quotes that only price the headline scope.
- Skip hire and waste disposal, itemised not bundled
- Asbestos survey allowance for pre-1999 buildings
- Making good to ceilings and walls after service runs
- Protection of retained floors, stairs and joinery
- Provisional sum basis for anything not yet chosen
Tolerances and standards that matter
Plastered wall flatness, floor level tolerances where new and existing floors meet, and door and window opening squareness are the finish-quality checkpoints most disputes come back to. A spec that references relevant British Standards for plastering and flooring finish gives you something objective to hold the work against.
Common questions
Should a renovation quote be one lump sum or broken down by room?+
Broken down by room and by trade wherever possible. A lump sum makes it impossible to see where the money is going, and impossible to value fairly if you later decide to drop or add a room from the scope.
Is it normal for parts of a renovation quote to be provisional sums?+
Yes, where a choice hasn't been made yet — kitchen units, tiling, sanitaryware. What matters is that the provisional figure is realistic and clearly marked, not a placeholder that will obviously be exceeded.
Who is responsible for damage caused by one trade to another trade's finished work?+
This should be stated in the specification before work starts. Without it, disputes over who pays to redecorate a wall damaged by a plumber are common and hard to resolve after the fact.
Get a room-by-room renovation specification
We visit, survey and write a specification before we price — so your quote is comparable and complete.