Bluebird Spaces
    Loft conversion and extension project in Raynes Park by Bluebird Spaces
    Raynes Park SW20

    Builders in Raynes Park for Lofts, Extensions & Renovations

    Hip-to-gable and dormer lofts, rear and side return extensions across Raynes Park and West Wimbledon, SW20.

    07564 041115Request a quote

    Raynes Park is in the London Borough of Merton, a short way from our base in SW19. The inter-war semis towards Raynes Park often have hipped roofs, which suit a hip-to-gable loft with a rear dormer, and the Victorian and Edwardian terraces nearer Wimbledon usually take a rear dormer and a side return. We don't have a finished Raynes Park project on the site yet; the nearest are our Wimbledon whole-house renovation and our Southfields dormer loft.

    Local project guide

    Planning a Raynes Park loft or extension

    Raynes Park is in the London Borough of Merton, with inter-war semis that often have hipped roofs alongside Victorian and Edwardian terraces. We check the roof, previous extensions, access and Merton's conservation-area and Article 4 maps before fixing the scope and price.

    What to check before choosing a contractor

    • Confirm whether the house is a semi or a terrace: the loft allowance is 50 cubic metres for a semi and 40 for a terrace.
    • Check Merton's conservation-area and Article 4 maps for the exact address before drawings start.
    • If the scheme adds close to 100 square metres of floor space, claim the CIL exemption before any work starts.
    Check Merton Council guidance

    Completed work

    Relevant projects for Raynes Park homeowners

    View all projects →
    Completed open-plan kitchen and rear extension in Wimbledon by Bluebird SpacesCompleted open-plan kitchen and rear extension in Wimbledon by Bluebird Spaces — view 2Completed open-plan kitchen and rear extension in Wimbledon by Bluebird Spaces — view 3
    Nearby example

    Wimbledon Whole-House Renovation, Loft Conversion & Rear Extension

    Full renovation · 25 weeks

    View project
    Completed loft conversion in Southfields, Wandsworth by Bluebird SpacesCompleted loft conversion in Southfields, Wandsworth by Bluebird Spaces — view 2Completed loft conversion in Southfields, Wandsworth by Bluebird Spaces — view 3
    Nearby example

    Southfields Dormer Loft Conversion

    Dormer conversion · 10 weeks

    View project
    Completed side-return extension in Earlsfield, Wandsworth by Bluebird SpacesCompleted side-return extension in Earlsfield, Wandsworth by Bluebird Spaces — view 2Completed side-return extension in Earlsfield, Wandsworth by Bluebird Spaces — view 3
    Nearby example

    Earlsfield Side-Return Kitchen Extension

    200 sq ft added · 8 weeks

    View project

    Building in Raynes Park: Merton's rules for semis and terraces

    Raynes Park follows Merton's planning rules. Most Raynes Park lofts and extensions come down to three questions: is it a semi or a terrace, is it in a conservation area, and how big is the scheme overall.

    Hip-to-gable lofts on inter-war semis

    A hip-to-gable conversion builds the sloping side of the roof up into a vertical gable, usually with a rear dormer. Outside conservation areas it can work under the 50 cubic metre allowance for semi-detached houses, as long as nothing rises above the existing ridge, materials match and side-facing windows are obscure-glazed and fixed shut below 1.7m. Any earlier roof extension counts towards the allowance.

    Read more: Loft conversions in Wimbledon and SW20 · Loft conversion types

    Certificates: Merton's refusal rate is low, but get one

    Most owners confirm a permitted development loft with a Lawful Development Certificate, £274 from April 2026. In our London Planning Datahub pull of 2 October 2026, Merton refused about 4% of the proposed-use certificates it decided in the year.

    Read more: Loft Lawful Development Certificates

    Rear extensions, prior approval and CIL

    Single-storey rear extensions over 3m and up to 6m on most houses (over 4m and up to 8m on detached houses) go through prior approval: Merton notifies neighbours and has 42 days to decide. In conservation areas that route isn't available, and side extensions and rear extensions of more than one storey need a householder application (£548). If a wraparound plus a loft gets close to 100 square metres of new floor space, the CIL exemption must be claimed and granted before work starts.

    Read more: House extensions in Wimbledon and SW20 · Wimbledon and Merton planning guide

    Our Services in Raynes Park

    Loft Conversions

    Dormer, mansard, hip-to-gable, and L-shaped conversions for period properties in Raynes Park.

    • 8–12 week build
    • Typical rear dormer with en-suite £80,000–£90,000 ex VAT
    Learn more →

    Extensions

    Rear, side return, and wraparound extensions. Open-plan living designed for homes in Raynes Park.

    • 8–14 week build
    • Typical side return £90,000–£100,000 ex VAT
    • Planning route checked by address
    Learn more →

    Raynes Park Cost Guide

    TypeTypical CostPlanning?
    Typical loft conversion (rear dormer with en-suite)£80,000–£90,000 ex VATOften no
    Typical kitchen / side return extension (build price; kitchen and flooring supplied by you)£90,000–£100,000 ex VATOften no
    Velux / Rooflight loftPriced at site visitUsually no
    L-Shaped DormerPriced at site visitCheck with us
    MansardPriced at site visitYes
    Rear ExtensionPriced at site visitOften no

    Typical project build prices, excluding VAT and professional fees (design, structural engineer, Building Control, party wall and planning fees). Prices are the same across every borough we cover; access and logistics (parking, skips, scaffold, restricted access) can affect the final price. Your fixed quote follows a site visit.

    Next step

    Discuss your Raynes Park project

    Tell us what you are considering and choose a callback or site visit. We will review the property, scope and likely approval route before preparing a clear, itemised proposal.

    • Federation of Master Builders member
    • No deposit upfront; weekly payments for completed work
    • Itemised quote with VAT and exclusions stated clearly

    Request a Raynes Park callback or site visit

    We'll confirm your callback or site visit within 24 hours.

    Common Questions

    Yes. Raynes Park is in the London Borough of Merton, so Merton's permitted development guidance, conservation areas, Article 4 Directions and CIL rules apply.

    Often, on a semi outside a conservation area, if the hip-to-gable plus any rear dormer and earlier roof extensions stays within 50 cubic metres and below the existing ridge. A Lawful Development Certificate (£274 from April 2026) confirms it.

    A typical loft conversion with us, a rear dormer with an en-suite, costs about £80,000–£90,000 to build, and a typical kitchen or side return extension about £90,000–£100,000 (build price; kitchen units, flooring and other second-fix items are supplied by you). Both exclude VAT and professional fees. Prices are the same across the boroughs we cover, though access and logistics can affect the final figure. You get a fixed quote after a site visit.

    Usually not for typical single-storey extensions. Merton says a permission for at least 100 square metres of new floor space will usually be liable, and the householder exemption must be claimed before work starts.

    Not a project we can show on the site yet. Our nearest are the 25-week Wimbledon whole-house renovation, with a loft conversion and rear extension, and the ten-week Southfields dormer loft.

    Nearby areas we cover

    Get Started

    Ready to talk about your project?

    Free consultation. Clear, itemised quote. No deposit upfront.

    Reach Out07564 041115