Modular buildings & garden dwellings in Louth
Modular buildings, Class 3 garden offices (up to 30 m²) and Class 3A habitable garden dwellings (32 to 45 m²) across Co. Louth, including Drogheda, Dundalk, Ardee, Clogherhead. An insulated garden office is €18,000 to €32,000, and a turnkey 35 to 45 m² Class 3A dwelling is €65,000 to €135,000 including 13.5% VAT.
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- 32 to 45 m²Class 3A exempt garden dwelling band in Co. Louth
- 66%of Co. Louth households in detached (39%) or semi-D (27%) houses
- 49,332occupied households in Co. Louth (CSO Census 2022)
- 1,951annual heating degree days near Drogheda
What modular buildings cost in Louth
Our price guide by size and specification, including 13.5% VAT on supply and installation.
| Job | Typical cost | What moves the price |
|---|---|---|
| Insulated garden office or studio, 12 to 16 m² (Class 3) | €18,000 to €32,000 | Cladding, glazing, base and cable run from the house |
| Large garden room or gym, 20 to 30 m² (Class 3 max) | €28,000 to €55,000 | Up to the 30 m² non-habitable exemption limit; no plumbing or kitchen |
| Class 3A habitable garden dwelling, 32 to 37 m² (1-bed) | €65,000 to €105,000 | Kitchen, shower room, Building Regs insulation, base and service hook-ups |
| Class 3A maximum garden dwelling, 40 to 45 m² (1 to 2 bed) | €80,000 to €135,000 | Largest exempt rear-garden unit (45 m² total garden structures cap) |
| Standalone 2 to 3 bed modular home, 75 to 85 m² | €175,000 to €255,000 | Full planning permission, BCAR, foundations and site services |
| Factory shell only (weathertight exterior), per m² | €1,200 to €1,800 a m² | Excludes groundworks, internal plumbing/kitchen and service connections |
| Insulated & fitted garden room rate, per m² | €1,600 to €2,400 a m² | Includes 13.5% VAT when supplied and installed by the builder |
| Turnkey habitable modular home rate, per m² | €2,400 to €3,200 a m² | All-in with kitchen, bathroom, foundations and 13.5% VAT |
Class 3 and Class 3A rules with Louth County Council
The 27 July 2026 planning exemptions (S.I. Nos. 338 and 340 of 2026) apply across all of Co. Louth:
- Class 3 non-habitable garden offices and rooms (up to 30 m²): exempt behind the front wall of the house, provided all garden structures total no more than 30 m², at least 25 m² of garden remains, and the room is not slept in.
- Class 3A habitable garden dwellings (32 to 45 m²): exempt in the rear garden when the homeowner lives in the main house, total garden structures do not exceed 45 m², the unit connects to the main house's services, is not sold separately or short-term let, and you submit 14 days prior written notification (with Eircode) to Louth County Council before starting work.
- Section 5 declaration: if you want written confirmation from Louth County Council that your build is exempt, you can apply for a Section 5 declaration (€80 council fee, 4-week statutory response window).
Gardens, house types and towns in Co. Louth
At the 2022 Census, Co. Louth had 49,332 households, with 39% in detached houses (24th highest of the 26 counties, against 41% nationally) and 27% in semi-detached houses (25% nationally). Together, 66% of homes in Louth are detached or semi-detached properties — the house types most likely to have the rear garden footprint and side access needed for a 30 m² Class 3 garden room or a 32 to 45 m² Class 3A modular dwelling.
Near Drogheda, a typical year records 1,951 heating degree days (17th coldest of the 26 county towns). For a year-round garden office or habitable Class 3A dwelling in Louth, specify insulated walls, roof and floor to Building Regulation U-values and A-rated double or triple glazing.
Main towns covered in Co. Louth (Census 2022 population): Drogheda (44,135), Dundalk (43,112), Ardee (5,478), Clogherhead (2,275), Dunleer (2,143), Termonfeckin (1,983).
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Louth modular building questions
How much does a modular garden dwelling or office cost in Louth?
An insulated, fitted 12 to 16 m² garden office costs €18,000 to €32,000, a 20 to 30 m² garden room €28,000 to €55,000, and a turnkey 32 to 45 m² Class 3A habitable garden dwelling €65,000 to €135,000, all including 13.5% VAT.
Do I need planning permission for a 45 m² granny flat in Louth?
Under Class 3A (S.I. No. 340 of 2026, in force 27 July 2026), a 32 to 45 m² detached habitable dwelling in your rear garden is exempt from planning permission if you live in the main house, keep total garden structures within 45 m², connect to the main house's services, and give Louth County Council 14 days prior written notice with your Eircode.
Do you cover all of Co. Louth?
Yes — including Drogheda, Dundalk, Ardee, Clogherhead, Dunleer and every rural townland in Co. Louth. Your enquiry goes to one vetted modular building supplier covering Louth.
Get a written turnkey price for your modular building
One vetted supplier covering your county checks access, foundations and service connections, and gives you a written price.