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Rear extension with full-width glass doors lit up at dusk

DesignApprovalsBuild

Extensions, loft conversions and new homes, designed and built for you

One contract from the first drawing to the completion certificate. A free home visit, an itemised fixed quote, and planning and building control handled for you.

  • Extensions, loft conversions, conversions and new builds
  • Planning, building regulations and party wall matters handled
  • Projects across England, Wales, Scotland and Northern Ireland
Get an instant guide priceCall 0800 088 6248

Book a free home visit

Tell us about your project. We reply to arrange a visit and a fixed quote.

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Free home visit and measured survey
Fixed price for the agreed specification
Drawings, approvals and build in one contract
Building control sign-off arranged
England, Wales, Scotland and Northern Ireland

Why one contract

Design, approvals and build, run by one company

One point of contact

You deal with one company from the survey to the completion certificate, instead of coordinating a designer, engineer and builder yourself.

Itemised fixed quote

Your quote lists what is included and excluded, priced against the drawings, so you can compare it properly.

Approvals handled

We check permitted development, make planning and building control applications and deal with party wall matters.

Written programme

Before work starts you get a programme showing each stage, so you know what happens when and when payments fall due.

Our projects

What would you like to build?

Every service, grouped by type. Guide prices include VAT and are UK averages; local pages adjust them for your area.

House extensions

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Single-storey rear extension with bifold doors open onto a patio and a glass roof lantern Single-storey extensionsA ground-floor room at the back or side, often with a flat roof and a roof lantern.From £1,950 per m²Learn more Double-storey rear extension in buff brick with a glass Juliet balcony and wide glazed doors Double-storey extensionsTwo floors of new space: a bigger kitchen below and a bedroom above.From £1,650 per m²Learn more Two-storey side extension in matching red brick on a semi-detached house with a block-paved drive Side extensionsUse the gap beside the house for a utility, study, garage or extra bedroom.From £1,700 per m²Learn more Kitchen-diner in a Victorian terrace with a long sloping glass roof along the side return Side return extensionsFill the narrow side alley of a terraced house to widen the kitchen.From £2,300 per m²Learn more L-shaped wraparound extension with a frameless glass corner and steel-look doors on a London terrace Wraparound extensionsAn L-shaped extension across the side return and rear for maximum space.From £2,200 per m²Learn more Open-plan kitchen extension with a sage green island, roof lantern and sliding doors to the garden Kitchen extensionsExtend and fit out a new kitchen-diner in one project.From £2,250 per m²Learn more Brick orangery with white French doors, glazed panels and a central roof lantern at sunset OrangeriesBrick piers, tall glazing and a lantern roof: a light-filled garden room.From £2,400 per m²Learn more Contemporary extension with full-height glass walls and dark cladding lit up at dusk Glazed and contemporary extensionsModern extensions with large glass walls, slim frames and clean lines.From £2,800 per m²Learn more New brick porch with a tiled roof and anthracite composite front door on a 1930s semi PorchesA brick or glazed porch to keep coats, shoes and draughts out of the hall.From £6,500Learn more

Loft conversions

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Full-width rear dormer loft conversion clad in dark tiles on a brick terraced house Dormer loft conversionsA box dormer adds full-height space at the back of the roof.From £48,000Learn more Semi-detached house with a rendered gable end and new clay roof tiles after a hip-to-gable conversion Hip-to-gable loft conversionsStraighten a sloping side roof into a gable wall for more space.From £55,000Learn more Mansard loft conversion with slate front slope and lead-clad dormers on a London terrace Mansard loft conversionsA steep-sided roof storey: the most space a loft can give.From £65,000Learn more Loft room used as a study with three roof windows above a desk and built-in shelving Rooflight loft conversionsConvert within the existing roof using roof windows: the simplest option.From £30,000Learn more Brick bungalow converted to a chalet bungalow with two front dormer windows Bungalow loft conversionsTurn a bungalow roof into bedrooms, often with front and rear dormers.From £45,000Learn more

Garage, basement and barn conversions

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Detached house where the garage door opening has been bricked up with a new window Garage conversionsTurn an integral or attached garage into a room, office or annexe.From £18,000Learn more Basement family room with a glass-walled lightwell bringing daylight down Basement conversionsConvert a cellar or dig a new basement for extra living space.From £1,900 per m²Learn more Converted red-brick barn with a full-height glazed opening and gravel courtyard at sunset Barn conversionsConvert a barn or agricultural building into a home.From £1,800 per m²Learn more Timber-clad single-storey garden annexe with glazed doors at the end of a lawn Garden annexesA self-contained annexe for family, guests or a home office.From £1,800 per m²Learn more

New build homes

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Newly completed contemporary detached house in brick, render and timber cladding New build homesOne-off new houses built for plot owners and self-builders.From £2,000 per m²Learn more Small development of brick semi-detached houses around a block-paved cul-de-sac Small housing developmentsDesign and build for schemes of two to nine homes.From £1,800 per m²Learn more

Renovations and structural work

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Renovated Victorian living room with a restored fireplace, sash windows and pine floorboards House renovationsWhole-house renovation: rewire, replaster, new layout and finishes.From £900 per m²Learn more Steel beam installed across a wide opening with props in place during a knock-through Structural alterations and knock-throughsRemove load-bearing walls with steel beams for open-plan living.From £4,500Learn more

Design and approvals

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Extension drawings and a floor plan on a desk with a scale ruler and a white model house Architectural design and drawingsMeasured surveys, planning drawings and building regulations drawings.From £1,500Learn more Surveyor measuring the rear of a brick semi-detached house with a laser measure Planning and building regulationsApplications, lawful development certificates, building control and party wall notices.From £750Learn more

Guide prices

How much will my project cost?

These are UK-wide guide ranges including VAT for the building work; design, structural calculations and council fees are extra. London runs about 30% higher and Northern Ireland about 14% lower. Your fixed quote follows a survey and drawings.

ProjectUK guide (inc VAT)
Single-storey extensions£1,950–£2,900 per m² of floor area
Double-storey extensions£1,650–£2,500 per m² of floor area (both floors)
Kitchen extensions£2,250–£3,400 per m² including a mid-range kitchen
Dormer loft conversions£48,000–£68,000 for a typical rear dormer with en-suite
Hip-to-gable loft conversions£55,000–£78,000 for a hip-to-gable with rear dormer
Garage conversions£18,000–£30,000 for a single integral garage
Structural alterations and knock-throughs£4,500–£9,500 for a typical knock-through with steel beam
New build homes£2,000–£3,200 per m² of floor area (build cost)
Work out my guide priceSee all prices
Stage 04 Walls and roof are built before the house is opened up, so most families can stay at home during an extension.

What happens next

From first visit to signed-off build

  1. 01

    Free home visit

    We look at the house, talk through what you want and measure up. There is no charge and no obligation.

  2. 02

    Design and fixed quote

    Drawings, structural calculations and an itemised price for the agreed specification.

  3. 03

    Approvals

    Permitted development check or planning application, building regulations and any party wall notices.

  4. 04

    Build and sign-off

    We build to the written programme and hand over the building control completion certificate.

How a project works in detail

Reviews

Verified reviews will appear here

We are building our review record from completed projects and will only publish verified reviews from real clients. Until then, ask us anything: we will answer plainly, in writing.

Questions

Common questions

Who will I have a contract with?

S&K Property Investments and Improvement Ltd (company number 16932889), part of the S&K Group. SK Developments is its brand for design and build projects. Specialist trades work under that one contract.

Is the home visit really free?

Yes. The first visit to look at your house, discuss the project and measure up for a quote is free and there is no obligation.

Do you only build, or do you design too?

Both. We can prepare drawings, arrange structural calculations and handle planning and building control, then build. Or we can build from drawings you already have.

Is your price fixed?

Your written quote is a fixed price for the agreed drawings and specification. If you change the design or something unforeseeable is found, such as poor ground, we explain the cost before doing any extra work.

How do payments work?

Your quotation sets out a deposit and stage payments tied to work completed, with the balance on completion.

Which areas do you cover?

We take on projects across England, Wales, Scotland and Northern Ireland. For islands and remote areas we confirm availability and any travel costs before quoting.

Do you handle planning permission?

Yes. We check whether your project is permitted development and, if not, prepare and submit the planning application.

Do you deal with building control?

Yes. We make the building regulations application (or building warrant in Scotland), book inspections and pass you the completion certificate.

More questions and answers

Coverage

Areas we cover

We take on projects across the UK. Choose your county or region for local guide prices and planning rules.

England

BedfordshireBerkshireBristolBuckinghamshireCambridgeshireCheshireCornwallCounty DurhamCumbriaDerbyshireDevonDorsetEast Riding of YorkshireEast SussexEssexGloucestershireGreater LondonGreater ManchesterHampshireHerefordshireHertfordshireIsle of WightKentLancashireLeicestershireLincolnshireMerseysideNorfolkNorth YorkshireNorthamptonshireNorthumberlandNottinghamshireOxfordshireRutlandShropshireSomersetSouth YorkshireStaffordshireSuffolkSurreyTyne and WearWarwickshireWest MidlandsWest SussexWest YorkshireWiltshireWorcestershire

Wales

ClwydDyfedGwentGwyneddMid GlamorganPowysSouth GlamorganWest Glamorgan

Scotland

Aberdeen and GrampianArgyll and ButeAyrshireDumfries and GallowayDunbartonshireEdinburghFifeGlasgowHighlands and IslandsLanarkshireRenfrewshire and InverclydeScottish BordersStirling and FalkirkTaysideThe Lothians

Northern Ireland

County AntrimCounty ArmaghCounty DownCounty FermanaghCounty LondonderryCounty Tyrone

Start with a free home visit

Call 0800 088 6248 or get an instant guide price online.

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Call 0800 088 6248Get a guide price