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 is one of our busiest postcodes for attic conversions, and the brief is shaped tightly by the local housing. The 1970s through 1990s semis across Laurel Lodge, Beechpark, Castleknock Park and Roselawn were built with shallow trussed roofs and tight first-floor landings, so the conversion is as much a stair-planning exercise as a roof one: we rework the trusses with the engineer to free up the floor, take the new stair up over the existing flight to protect the landing, and add a rear dormer or rooflights to win the 2m head-height run the regulations need. The result is almost always a double bedroom with a small ensuite, the highest-value single move a Castleknock three-bed semi can make. The larger detached homes on the Phoenix Park edge around Castleknock village and the College sit on wider plots and roofs with more usable volume from the start, so they support fuller dormer schemes and sometimes a double-storey or wraparound rear extension alongside. Cavity-wall construction throughout makes the rear open up cleanly for a wide steel, and most single-storey rear extensions in the area fall under the 40 sqm exemption. Garage conversions to a home office or utility feature on the wider Carpenterstown and Diswellstown stock. The newer outer Castleknock estates follow the same 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?
Every house extensions and attic conversions project in Castleknock is run personally by Marcin's in-house team — site visits within the working week on the Dublin side of the city, and same-day answers on WhatsApp. For the full detail on how we approach house extensions and attic conversions — process, specification and certification — see the extensions service page.
Full extensions detail & process →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.
In most of the Laurel Lodge, Castleknock Park and Beechpark semis the original landing is tight, so the new attic stair is the first thing we design. We typically take it up over the existing flight in a winder or quarter-turn so you keep a usable landing on the first floor and still meet the 2m head-height run the regulations require at the top. On the wider Carpenterstown and Diswellstown detached stock there is usually room for a straight flight. We confirm the stair line and the resulting head height at the first site visit before anything is quoted.
A standard attic conversion that stays within the existing roof and adds rooflights is generally exempt, even on the larger park-edge roads around Castleknock village and the College. A rear dormer to gain full standing room can also be exempt within the size limits, but where a home sits in a more sensitive setting near the Phoenix Park or is unusually prominent, we flag the planning question at the first visit and handle the application if one is needed.
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.
More local detail
Related work in Castleknock and nearby.
Extensions · Castleknock
Planning house extensions and attic conversions in Castleknock?
Same-day replies on WhatsApp. Calls and emails answered within one working day.