RSM Construction Dublin
    Home Extension in Killiney — luxury renovation by Dublin's premium construction company
    South County Dublin · Ireland

    Home Extension in Killiney

    Adding space, light and value to Killiney family homes

    Home Extension · Killiney

    Home Extension Specialists Working Across Killiney

    Home extensions are one of the most transformative projects we deliver in Killiney, where large detached family homes set on generous hillside plots often have generous gardens but compact rear ground-floor layouts. Our team coordinates architects, structural engineers and our directly-employed trades under one contract, taking the project from initial design and planning advice through to foundations, envelope, glazing and a fully fitted-out interior. Every Killiney extension is built to current insulation and air-tight standards, integrates cleanly with the existing home and is delivered with a clear week-by-week programme.

    What's Included

    Our Home Extension Service in Killiney

    Rear, side and two-storey extension design and build
    Full structural and Building Regulations-compliant construction
    High-performance glazing, insulation and air-tight detailing
    Seamless integration with the existing home throughout

    Home Extension for Homes in Killiney

    A home extension involves foundations, walls and roof, connecting the new structure to the existing house, opening up internal walls, extending services and finishing the new space so it reads as part of the original home. RSM manages groundworks, structural work, building envelope, first and second fix, and finishes as one design-and-build project.

    Killiney homes on hillside plots often have level changes between the house and the garden. Extensions here may need retaining structures or stepped floors, and designs often aim to connect living spaces with terraces and views.

    For a full overview of the service, see our home extension service across Dublin, or read more about our renovation and construction work in Killiney.

    Planning a Home Extension Project in Killiney

    A good extension feels like it was always part of the house, which depends on how the new and existing structures meet.

    • Finish continuity: Floor levels, ceiling lines and joinery details help the extension read as one home.
    • Layout: The extension should improve how the whole ground floor works, not just add floor area.
    • Connection to the existing house: Openings into the original walls usually need steel or engineered beams and careful sequencing.
    • Natural light: Roof lights and glazing positions affect both daylight and how the space stays comfortable.

    On sloping Killiney sites, ground conditions and retaining walls should be assessed by an engineer before foundations are designed.

    Related Services in Killiney

    Projects often combine more than one type of work. Homeowners in Killiney also ask us about kitchen renovation in Killiney, attic conversion in Killiney and builders in Killiney.

    Why Choose RSM

    Why Homeowners in Killiney Choose Us for Home Extension

    Architect, structural engineer and trades coordinated in-house
    Single-contract delivery from concept to handover in Killiney
    Energy-efficient, Building Regulations-compliant builds
    FAQs

    Home Extension in Killiney — Frequently Asked Questions

    The questions homeowners in Killiney most often ask us about home extension.

    Some extensions in Killiney may be exempt from planning permission and others will need it. Exemptions generally depend on the size, height, position and the amount of garden remaining, and they do not apply in the same way to protected structures or homes in some designated areas. Because the rules depend on the specific property, we recommend confirming this with your architect or the local authority before design is finalised.

    A single-storey home extension usually takes a few months on site, from groundworks to finishing, while larger or two-storey extensions take longer. Weather, structural complexity and how much of the existing house is being altered all affect the programme. For Killiney projects we agree a phased programme after drawings and engineering are complete, so each stage is planned rather than improvised.

    Yes, two-storey extensions can be built on many Killiney homes, subject to planning, site space and structural design. A two-storey extension usually needs planning permission and careful attention to neighbouring light and privacy. Structurally, the new walls, floor and roof must tie into the existing house properly. We work from engineered drawings and coordinate each stage of the build with your design team.

    We work with architects and engineers to deliver extension design in Killiney, either alongside your own design team or by bringing in suitable professionals. Good design considers how the extension connects to the existing rooms, natural light, structure, insulation and planning constraints. Having the builder involved early helps make sure the design is practical to construct and the details are resolved before work begins.
    Nearby Areas

    Also Serving Nearby Areas

    We also deliver home extension in the neighbourhoods surrounding Killiney.

    Home Extension in Dalkey — luxury renovation by Dublin's premium construction company
    South County Dublin

    Home Extension in Dalkey

    View Page
    Home Extension in Foxrock — luxury renovation by Dublin's premium construction company
    Dublin 18

    Home Extension in Foxrock

    View Page
    Home Extension in Killiney Hill — luxury renovation by Dublin's premium construction company
    South County Dublin

    Home Extension in Killiney Hill

    View Page
    Back to Killiney All Home Extension Info

    Get a Free Quote for Home Extension in Killiney

    Tell us about your Killiney project and we'll arrange a free site visit and a fully tailored quotation within 24 hours.