StonevantaConstruction 07778 557569

Domestic construction · London

Homes, set in stone.

We build new homes, extensions and loft conversions across London — in brick, block and natural stone, from the first peg in the ground to the keys in your hand.

Start a project How we build
  • Company no. 17338443
  • Est. 14 July 2026
  • Office 35 Haymarket, SW1

Move the cursor to rake the light across the stoneDrag across the stone to move the light

The firm

A house should outlast the people who build it.

Stonevanta Construction is a London building company for domestic work: new houses, extensions, loft conversions and structural alterations, with a mason's eye for natural stone. We set up in 2026, with an office on Haymarket, to do one thing properly — build homes that are plumb, dry and still handsome in a hundred years.

We work as your main contractor. That means one programme, one price and one person who answers the phone — from setting out the foundations to handing over the completion certificate.

  1. IOne contractA fixed price and a written programme, agreed before anyone digs.
  2. IIOne site managerNamed on day one, on site every working day, on the phone every evening.
  3. IIIOne standardPlumb, level, square and dry — checked at every stage and photographed for you.
Front of a stone-faced house with slate-grey windows, a black front door and clipped bay trees
Coursed stone, slate-grey frames — the kind of house we build.

What we build

Four wayswe build.

Every job is domestic, every job is run by us from start to finish. Pick the one that sounds like yours — or call, and we'll tell you which it is.

  1. I New homesDetached and semi-detached houses, replacement dwellings, mews houses and small schemes of up to nine homes — groundworks to handover.Typical programme 9–14 months
  2. II ExtensionsRear, side-return, wraparound and two-storey extensions, with the steels, drainage and Party Wall paperwork that come with them.Typical programme 10–20 weeks
  3. III Lofts & alterationsDormer, hip-to-gable and mansard lofts; knock-throughs, new openings and other structural work to an engineer's design.Typical programme 6–12 weeks
  4. IV Stone & masonryNatural stone walling and cladding, ashlar dressings, lime pointing, garden walls and steps — laid by masons, not by the yard.Bath · Portland · York · flint

How we build

The build,drawn to scale.

Every house we build passes through the same seven stages. Scroll on, and watch one take shape on the drawing board — from a bare plot to sunlight on the kitchen floor.

24.50 24.25 24.00 23.75 T1 OAK +24.62 +24.48 +23.71 +23.80 +23.90 TBM 24.000 Ex. 150 foul sewer FOOTWAY ACACIA ROAD N 11 400 8 600 11 800 6 000 14 280 = 14 280 ✓ MH1 SA 1:40 1:40 BC ✓FOUNDATIONS UP KITCHEN / DINING5.4 × 5.9LIVING3.9 × 4.3STUDY3.9 × 3.7HALLSNUG4.5 × 2.9UTILITYWC 15:00 COMPLETEKEYS HANDED OVER FLAT ROOF + LANTERNHIPPED ROOF · PLAIN CLAY TILES · 35° WATERTIGHTROOF · WINDOWS
Stonevanta Construction SV-101 · Ground floor Scale 1:100 @ A3 Rev G — Handover
  1. Rev A · Week 0

    Survey

    Measured survey, levels, trees and drains, and a soil investigation if the ground needs one. We check the architect's drawings against the plot before anyone orders a brick.

    A pencil and scale rule on a dimensioned construction drawing
  2. Rev B · Week 1

    Set out

    Profile boards and string lines put the house on the ground. The diagonals are measured to the millimetre — if the corners aren't square here, they never will be.

    Aerial view of a house's ground-floor walls set out on a cleared plot
  3. Rev C · Weeks 2–6

    Groundworks

    Foundations dug, inspected by Building Control and poured; drainage laid to fall and tested; oversite slab and damp-proof course.

    Concrete being poured and levelled into a foundation trench
  4. Rev D · Weeks 6–16

    Superstructure

    Walls go up course by course: insulated cavity, lintels, floors. Plumb and level are checked on every lift, not at the end.

    A bricklayer setting a concrete block on a fresh bed of mortar
  5. Rev E · Weeks 16–22

    Roof & watertight

    Trusses or a cut roof, membrane, battens, tiles or slate; windows in. From here the weather stays outside and the trades come in.

    Two roofers laying tiles across battens on a pitched roof
  6. Rev F · Weeks 22–38

    Fit-out

    First fix, plaster, second fix; kitchen, bathrooms, joinery and decoration. Air-tightness and ventilation tested before we close up.

    A new kitchen being fitted, units still wrapped in protective film
  7. Issued · Week 40

    Handover

    A snagging walk-round with you, the completion certificate, warranty documents, manuals — and the keys. Then a call at six months and at twelve to see how the house is living.

    A finished open-plan living room with a wood-burning stove and tall windows onto trees

Timings are typical for a two-storey detached house. Yours are set out week by week in the programme we agree with you.

Standards

Plumb. Level.Square. Dry.

Four words a good builder checks every day. We check them, write them down and photograph them — so the parts of the house you'll never see are on record.

Plumb

Walls checked with a level and laser on every lift of brick or block, not just when the scaffold comes down.

Every lift · photographed

Level

Floors, sills and window heads set to one datum, taken from the survey benchmark and carried round the whole house.

One datum · ±0

Square

Diagonals measured when we set out and again at wall-plate. Two equal numbers mean four true corners.

Diagonals equal ±5 mm

Dry

DPC, cavity trays, membranes and flashings photographed before they're covered. The leaks that never happen are the ones we check for.

Covered-up work · on record
Building RegulationsInspected at every stage, from open trenches to completion.
Structural warrantyArranged on every new home with a recognised provider.
Party WallNotices and surveyors organised before work starts, not after.
CDM 2015On domestic jobs we carry the client's duties as principal contractor.
Hands marking up a large drawing with a scale rule and a rolled plan

Before you commit

The FoundationBrief.

A fixed-fee review of your plot or house and your drawings, delivered in three weeks. You come away knowing what it costs, how long it takes and what has to be approved first — whether or not you build with us.

  1. 01Site visit and measured check
  2. 02Buildability review of the drawings
  3. 03Cost plan, element by element
  4. 04Outline programme, week by week
  5. 05Approvals checklist: planning, Building Regs, Party Wall, warranty, utilities
  6. 06A written price to build, valid for 60 days

The fee is credited in full against the build if you go ahead with us.

Book a Foundation Brief

Who we build for

Four kindsof client.

01

Homeowners

An extension, a loft, a house rebuilt on the same plot. We explain each stage before it starts and keep the site safe around family life.

Talk to us 02

Self-builders

You have the plot and the plans. We build them as main contractor, or take a design from planning drawings to a buildable set.

Talk to us 03

Architects & designers

A contractor who reads the drawings, asks early and builds the detail as drawn — with photographs of anything that will be covered.

Talk to us 04

Small developers

Schemes of up to nine homes on JCT terms, built to the standard a warranty inspector signs and a buyer's surveyor respects.

Talk to us

Next step

Lay thefirst stone.

Tell us about the plot, the house or the drawings. We reply within one working day and can usually visit within the week.

07778 557569 info@stonevanta.co.uk