Extensions · Castleknock, Dublin
House Extensions, Attic & Garage Conversions in Castleknock.
Extensions, attic and garage conversions — design, build and certify in one. Run in-house by Marcin's team across Castleknock and the wider Dublin area.
Castleknock · The area
Why house extensions and attic conversions in Castleknock are a familiar brief.
Castleknock extension briefs are dominated by the mid-century estate housing across the centre and the larger detached homes near the Phoenix Park edge. The estate housing supports the standard mid-century extension template: cavity-wall opening up cleanly at the rear, generous gardens supporting full single-storey extensions under the 40 sqm threshold, side returns where plot allows. The Phoenix Park edge homes support more ambitious briefs: double-storey rear extensions, wraparound extensions combining side and rear, and full kitchen-dining-living open-plan extensions. Attic conversions feature across all stocks, the Castleknock roof pitches typically support a rear-dormer scheme. Garage conversions feature for a home office or utility. The newer outer estate developments follow the same modern extension template.
House Extensions, Attic & Garage Conversions · How we run it
House Extensions, Attic & Garage Conversions in Castleknock, the way it should be done.
Extensions are where most clients first speak to us. The reasons vary — a growing family, an attic that has become storage by default rather than design, a 1970s side return that is too cold to use — but the question is always the same: how do we add space to a house that is otherwise lovely, and have it feel like it was always there?
We run extensions end to end. Where you have an architect, we build to their drawings and become the single point of accountability through planning, structural design and construction. Where you do not, we coordinate the architect and engineer ourselves and quote the build to a clear specification before work starts.
Attic conversions are one of our most common projects — adding a bedroom with ensuite to an Irish three-bed semi is one of the highest-value moves a client can make, and it is squarely within our scope. Garage conversions follow the same pattern: insulation, blockwork, plastering, electrics, plumbing and joinery, all run by one team.
The work in Castleknock runs to the same specification we apply everywhere across Dublin and Leinster. Materials, sub-trade coordination, planning context and final certification are all managed from one studio. If your project is on the dublin side of the city, expect site visits within the working week and same-day responses on WhatsApp.
Extensions in Castleknock
Common questions about house extensions and attic conversions in Castleknock.
Yes. Castleknock is a regular service area for us. Renovations, extensions and bespoke joinery in Castleknock. Mid-century estate housing, larger detached homes around the Phoenix Park edge, and newer developments — Castleknock is a high-volume west-Dublin renovation postcode. If your project sits in this area we will arrange a site visit, give you an honest indication of scope and timeline at the first meeting, and follow up with a written fixed-price quotation.
Most rear extensions under 40 sqm fall under planning exemption, subject to conditions on height, height to eaves, and proximity to boundaries. We will tell you at first site visit whether your project is exempt or needs planning, and we coordinate the application if it does.
Most Dublin three-bed semi attic conversions run 8 to 12 weeks from the day the scaffold goes up. Adding an ensuite extends it slightly. We give a written schedule and update it weekly.
Yes. We routinely build to architects’ and engineers’ drawings as the main contractor. You get one point of accountability on site.
Yes — we coordinate the engineer and assigned certifier as part of the project so the certification is in place at completion.
Also in Castleknock
Other capabilities we run in Castleknock.
Bathrooms in Castleknock
Plumbing, tiling, showers, wet rooms and ensuites — finished by one team.
Electrical in Castleknock
Lighting design, sockets and LED strip — wired and signed off correctly.
Carpentry in Castleknock
Feature walls, wardrobes, kitchens and panelling — drawn, made and fitted in-house.
Extensions elsewhere
House Extensions, Attic & Garage Conversions in nearby areas.
Extensions · Castleknock
Planning house extensions and attic conversions in Castleknock?
Same-day replies on WhatsApp. Calls and emails answered within one working day.