A general builder in South London works out at roughly £450 to £500 a day excluding VAT. Before you use that number, it is worth knowing where it comes from, because it is not a figure anybody has measured.
The London figure is derived, not measured
This is the honest starting point and almost no competing page says it. Nobody publishes a London builder day rate; what is published is a national average and a stated uplift, and the two get multiplied together. Checkatrade publishes a UK average of around £400 a day excluding VAT. It also publishes a London uplift of around £80 a day. Applying the second to the first gives roughly £480, and a working range of £450 to £500 excluding VAT.
That is a derivation from a stated rule, not an observation of London builders. It is the most defensible construction available, and it is still a construction. MyBuilder approaches it differently, putting London and the South East 20 to 40% above the national average, which over a £400 base gives £480 to £560 excluding VAT. That is a similar answer by a different route, which raises confidence without settling anything.
Treat any page quoting a precise London builder day rate as fact with suspicion. There is no such measurement to quote.
The derivation, stated in full
The whole London figure rests on two numbers Checkatrade publishes about itself, and it is worth setting them out so you can check the working.
The first is the UK average: around £400 a day, and around £50 an hour, both excluding VAT. The second is the uplift Checkatrade applies to London: around £80 more per day, and around £5 more per hour. Add them and London lands at roughly £480 a day and £55 an hour excluding VAT, which is where the £450 to £500 working range comes from.
That is arithmetic on a published rule, not a survey of what London builders charged last month. Nobody has run that survey, or at least nobody has published it. The number is useful because the rule behind it is stated openly by a source that specialises in this, and it is limited for exactly the same reason.
So use a day rate as a sanity check on a quote rather than a prediction of one. If a quote implies £470 a day, the derivation says that is ordinary. If it implies £900, the derivation gives you a reason to ask what is in it.
VAT is the first thing to establish
Published cost guides normally exclude VAT. A quote from a VAT-registered builder normally includes it. Twenty per cent on £480 is £96 a day, which over a three-week job is a difference of several thousand pounds.
There is also a legitimate reason a builder might charge none at all. The VAT registration threshold is £90,000 of taxable turnover, so a small sole trader is not registered and has no VAT to add. That is lawful and unremarkable. It is a different thing entirely from a registered firm offering to drop the VAT, which it cannot do.
What a day rate covers
A day rate typically buys an eight-hour working day of labour. It does not include materials, VAT, skip hire, scaffolding, plant or specialist trades. Those arrive as separate lines, and a quote built on a day rate with none of them named is incomplete rather than cheap.
Ask for labour and materials to be separated. That is the Federation of Master Builders' own advice, and it is the single change that makes two quotes comparable.
Day rate against fixed price
This is the question homeowners should be asking instead, and no published source frames it clearly.
A day rate transfers the risk of overrun to you. If the job takes fourteen days rather than ten, you pay for fourteen. A fixed price transfers that risk to the builder, who prices it accordingly. A fixed quote usually looks higher and is often the safer number to accept.
Day rates suit open-ended work where nobody can sensibly scope the job in advance: chasing a damp problem, opening up a floor, remedial work behind a wall. Fixed prices suit anything that can be drawn and specified.
The London costs that sit outside the rate
A London builder's day rate is perhaps a fifth to two-fifths above the national average. The day rate is not why the job costs what it does.
- Access. Terraced South London housing often has no side or rear entry, so every bag of spoil and every length of timber goes through the house. No cost guide prices this and it is a real labour multiplier.
- Parking. In a controlled parking zone, permits or bay suspensions are a daily hard cost billed on to you, and suspensions need advance notice to the borough.
- Waste. A skip on the highway needs a council licence. Southwark charges £105 a month for one, a council fee rather than a trade rate. Where there is no space for a skip, waste leaves by grab lorry or bagged removal, which costs more.
- Party wall agreements. Structural work touching a shared wall engages the Party Wall etc. Act 1996, and where a neighbour dissents you pay for the surveyors. A mid-terrace with neighbours both sides can mean two awards.
- Working around occupants. Dust protection, daily clean-down and keeping a kitchen usable all slow a job down, and most London domestic work happens in an occupied house.
The day rate is the smallest part of that list.