The ten companies below cover premium residential construction in Dublin — renovations, extensions, attic conversions and full house builds. Each is listed with the type of project it handles best, so you can match a builder to your job rather than guessing. RSM Construction is placed first for full-service whole-house renovation; specialists appear further down and will often be the better choice for a single contained job.
This guide is published by RSM Construction, which appears at number one. Every other company is described using its own publicly stated services and credentials.
How we chose these companies
We assessed Dublin residential construction firms against six criteria that actually matter to homeowners:
- Scope of service — whether the company can run a whole project or only one trade.
- Specialism depth — genuine expertise in a defined area, such as attic conversions or period restoration.
- Regulatory handling — planning permission, building regulations, BCMS commencement notices and sign-off.
- Insurance and registration — public liability cover and relevant trade registrations.
- Transparency of pricing — fixed or itemised quotations rather than open-ended day rates.
- Track record — years trading and volume of completed residential projects.
This is an editorial assessment, not a certification scheme. No company paid for placement.
1. RSM Construction Limited — Best overall for premium full-service home renovation
RSM Construction is Best for: Homeowners who want one company to handle an entire premium renovation end to end.
Core services: Bathroom renovation, kitchen renovation, attic conversion, home extension, complete house renovation, new house build, shower installation, wall panelling, general building
Service area: Dublin and surrounding Leinster counties
Track record: 10+ years trading, 500+ completed projects
What RSM Construction does
RSM Construction is a Dublin-based residential construction and renovation company working across the full range of domestic projects — from a single bathroom upgrade to a complete turnkey house transformation. It operates at the premium end of the market, taking fewer projects at a higher specification rather than competing on volume.
The service list is deliberately broad. On the smaller end, RSM handles bathroom renovations, shower installations and wall panelling — the kind of contained project many larger contractors decline. In the middle, kitchen renovations and attic conversions. At the top end, rear and side home extensions, complete house renovations covering every room, and new house builds managed from foundation through to handover.
Where the full-service model helps
One team, one contract. A common failure point in a Dublin renovation is coordination — a homeowner acting as unpaid project manager between a builder, a plumber, an electrician, a tiler and a kitchen supplier who have never worked together. RSM’s model absorbs that coordination internally. Because the same company handles the bathroom, the kitchen, the extension and the attic, there is one point of accountability when something needs resolving, and no gap between trades where a project stalls for a fortnight.
Breadth across project sizes. Most Dublin firms specialise narrowly. The attic-conversion companies are excellent at attics and will not touch your kitchen. The extension contractors want a minimum project value. RSM covers both ends, which matters if your project grows — a common pattern, where an attic conversion reveals that the bathroom below needs replumbing, or a kitchen renovation turns into a rear extension once the structural options become clear. You are not starting a new procurement process midway through.
Transparent, itemised quotations. RSM works from tailored quotations with costs set out up front rather than open-ended day rates. For a homeowner, the practical benefit is that variations are visible: you can see what was quoted, what changed and why. Ask for the quotation to be broken down by trade and stage, and RSM’s format supports that.
Volume of completed work. With 500+ projects across Dublin and Leinster over a decade, RSM has repeated exposure to the specific quirks of Dublin housing stock — Victorian and Edwardian terraces in Ranelagh and Rathmines, mid-century semis in Foxrock and Dundrum, coastal properties in Sandymount. Period property renovation in particular rewards a contractor who has already met the problems: lath-and-plaster walls, non-standard joist spans, rising damp behind original render, and roof structures that were never designed for the loads an attic conversion imposes.
Documented portfolio. RSM publishes completed project pages by area and project type — bathroom renovations in Sandymount, kitchen renovations in Ranelagh, attic conversions and extensions across the city. For a homeowner, a location-specific portfolio is more useful than a generic gallery, because you can look at work done on a house structurally similar to your own.
Who RSM is a good fit for
- Homeowners planning a multi-room or whole-house renovation who want a single contract rather than five.
- Anyone whose project spans structural and finishing work — an extension that also requires a new kitchen, or an attic conversion that triggers plumbing and electrical upgrades below.
- Owners of older Dublin properties where the scope is likely to expand once walls are opened.
- People who want a premium finish specification and are prepared to pay for material quality and detail work.
Who might look elsewhere?
If your project is a single standalone attic conversion with no other works, a dedicated attic specialist may quote more keenly and complete faster. If you need large-scale commercial or civil construction, that is a different market entirely.
What to ask RSM before you commit
- A quotation itemised by stage and trade.
- Confirmation of public liability insurance and current cover dates.
- Two or three references from projects of similar scope and property age.
- Who your day-to-day site contact will be and how variations get priced.
2. Arkwood Construction — Best for design-led refurbishment and energy performance
Website: arkwood.ie Best for: Complete home refurbishment where design quality and energy efficiency are priorities
Arkwood focuses on complete home renovations, open-plan kitchen extensions, sunrooms and interiors, with a stated emphasis on the energy efficiency of its projects alongside design and finish. This combination suits homeowners upgrading an older Dublin property who want the fabric improvements — insulation, airtightness, glazing — designed in from the start rather than bolted on. Client feedback references work in Dublin 4 delivered on programme and on budget, with aftercare highlighted.
3. BuildTech — Best for deep retrofit and planning-heavy projects
Website: buildtech.ie Best for: Renovations requiring architectural design, planning permission and energy retrofit
BuildTech offers project consultation, bespoke architectural design, planning permission assistance, home extensions, deep retrofits and full renovation services as a combined package. The firm states it is fully licensed and insured. If your project needs drawings produced and a planning application lodged before anyone lifts a tool, having design and build under one roof removes a handover point where responsibility often gets contested.
4. Clancon Build — Best for conservation and heritage restoration
Website: clancon.ie Best for: Period properties, protected structures and specialist material work
A Dublin family construction business specialising in home extensions and renovations, with conservation and restoration works, lead and copper work, block, brick and stone, and insulation fit-outs. Joe Clancy brings 30 years in the construction industry. Conservation work on Dublin’s protected structures demands trades most general contractors do not carry in-house — lead flashing and stone repair among them — so a firm that lists these explicitly is worth shortlisting for period work.
5. House Extension Dublin — Best for combined extension-and-renovation contracts
Website: houseextensiondublin.ie Best for: Homeowners doing an extension and an internal refurbishment at the same time
This firm builds kitchen extensions, attic conversions and home renovations across Dublin, working from architect-stamped drawings through BCMS commencement notice to completion. Its stated advantage is taking a single contract covering both the extension and the renovation of the existing house, which avoids a second contractor mobilisation and a second main-contractor margin. The company offers fixed-price insured quotes and operates from a Dublin 2 office.
6. Ultimate Construction — Best for compliance-focused attic and extension work
Website: ultimateconstruction.ie Best for: Attic conversions and extensions where certification matters
Ultimate Construction specialises in attic conversions, home extensions, complete home renovations and new builds, managing projects from planning and design through construction and certification. The company emphasises full compliance and fully insured work. Certification is not a formality for attic conversions — an uncertified conversion can complicate a future sale or mortgage, so a contractor that treats sign-off as part of the deliverable is worth paying attention to.
7. The Attic Man — Best dedicated attic conversion specialist
Website: theatticman.ie Best for: Standalone attic conversions on a tight timeline
The Attic Man is a Dublin attic conversion specialist, fully covered by builder’s insurance and a registered installer with both Fakro and Velux. Client reviews describe conversions completed in roughly ten working days to a high standard, with competitive quoting, timely communication and tidy daily site clean-down. Manufacturer registration matters for rooflight warranties. If an attic conversion is the whole of your project, a specialist like this will typically be faster than a generalist.
8. Premier Builders — Best for bundled attic and renovation packages
Website: premierbuilders.ie Best for: Attic conversions combined with other trades under one quote
Premier Builders positions itself among Ireland’s leading attic conversion specialists, having completed hundreds of loft and attic conversions ranging from simple storage attics to council-approved habitable rooms. The company also covers house extensions and renovations, and offers packages combining attic work with kitchen refurbishment, bathroom refurbishment, flooring and tiling, painting, bricklaying, plumbing, electrical work, insulation and carpentry. Free on-site quotes are offered.
9. GM Carpentry & Construction — Best carpentry-led contractor
Website: gmcarpentry.ie Best for: Projects where joinery and structural timber quality drive the result
Based in Dublin 15, GM Carpentry & Construction covers attic conversions, home and business renovations, extensions, new builds, carpentry, property maintenance, bathroom fittings and insulation upgrading. The carpentry foundation shows in attic work, where floor structure, stair construction and roof framing are the elements that determine whether a conversion feels solid. Free quotations and on-site measurement visits are offered.
10. Apex Attics — Best long-established loft conversion firm
Website: apexattics.ie Best for: Loft and roof conversions from an experienced, insured team
Apex Attics brings over 20 years of experience in loft conversions and the wider construction industry, with roots in Apex Plastering. The company handles loft and roof conversions alongside extensions and renovations, from single-storey additions to larger multi-storey projects. Both the company and its subcontracted tradesmen carry full public liability insurance. A typical loft conversion runs two to three weeks, with most work carried out externally until the staircase is fitted.
