The survey never tells your client the cost.

A survey says what is wrong with a house. It does not say what the work will cost. Send us the house. Nick views it with your client, and a budget follows in 24 hours.

A lower ground floor opened up, with cables coiled on the slab, steel stud framing at the side and a drainage pipe on the floor.

Steel framingwalls not yet built

Temporary propsholding the structure

Drainagerouted before the floor

Cablesfirst fix, before plaster

A lower ground floor opened up, before the walls closeOn site, photograph

i The survey

A survey can call a house sound and leave the bill blank.

Your client has found the house. The offer is agreed.

The survey reads the building. It does not price the new kitchen, the basement or the rewire.

Surveys reduce uncertainty. They cannot reveal every condition hidden in an older house. Wiring, drainage, floors and earlier alterations often need attention once they are exposed.

Our advice to buyers is simple. Talk to us before you exchange. It matters most if they plan to extend or change the layout.

The survey reads the house. Nobody has read the work.

ii What the work costs

Eight kinds of work, and what each costs in 2026.

Indicative construction ranges for prime London, from our 2026 cost guide. Each bar runs from its low figure to its high one.

  1. Rear kitchen extensionSingle storey rear addition

    £160k to £250k

  2. Side return extensionInfill the side passage

    £140k to £220k

  3. Wraparound extensionRear and side expansion

    £200k to £320k

  4. Two-storey extensionGround and first floor addition

    £220k to £400k

  5. Main dormer loftClassic rear roof extension

    £90k to £140k

  6. Mansard loftRoof level rebuilt for volume

    £140k to £220k

  7. Existing basement conversionUpgrade existing lower ground space

    £180k to £300k

  8. New basement excavationCreate new space below ground

    £500k to £900k and above

Professional fees, statutory costs, party wall, contingency and VAT are separate. Ranges are guide prices, not fixed quotations.

Three of the site team digging out a basement under a steel beam, with temporary props and a ladder behind.
A basement dug out under temporary props and steelOn site, photograph

iii Three numbers, in order

A budget now. A price later. Nothing guessed.

  1. Before exchange

    A budget range, in the Buyer’s Report

    Nick views the house with your client. What is possible, a budget range and the timescales, within 24 hours. It is a budget, not a quote.

  2. After exchange

    The cost plan, line by line

    Our quantity surveyor, Matt Coverley, prices the work from the drawings. Provisional sums are named, not buried.

  3. Design locked

    The build cost, fixed

    The cost is fixed once the design team locks the second fix scope. Then one contract.

The same order as our twelve step process, from the budget estimate to the cost plan.

iv For your client

You find the house. We read the work.

You find and negotiate. We set out the budget for the work, and build it if asked.

What is possible

What the house could become.

Extensions, a basement, a new layout. What planning may allow, as possibilities, not promises.

A budget range

From our 2026 rate card.

For the work that house needs. The priced cost plan follows exchange.

On site, as often as needed

No limit on visits.

We return to the house with your client, as often as needed.

Send us the house.

The listing link or the address, and one way to reach you. The Buyer’s Report is free.

Nick has the house.

He will call you to arrange a viewing with your client. The report follows within 24 hours of it.

Read the work before exchange.

Ranges are guide prices, not fixed quotations. Professional fees, statutory costs, party wall, contingency and VAT are separate.