Timber, steel, SIPs or log cabin: which garden room?
The short answer
Insulated timber frame is the most common and flexible choice. SIPs panels are fast to build and very well insulated. Steel frames won't rot or warp but need careful insulation. Log cabins are the cheapest per m² but are often less insulated. In Ireland, the roof, insulation and water detailing matter more than the frame.
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At a glance
| Type | Strengths | Watch out for |
|---|---|---|
| Timber frame | Flexible design, easy to insulate well, widely available | Quality varies by builder; needs good damp protection |
| SIPs panels | Very well insulated, airtight, quick to put up | Less flexible to alter later; joints must be sealed well |
| Steel frame | Won't rot, warp or attract insects; precise | Needs a thermal break to avoid condensation |
| Log cabin | Lowest cost per m², natural look | Often thin insulation; timber shrinks and settles |
Timber frame
A timber stud frame filled with insulation, sheathed, clad outside and lined inside, much like a timber-frame house. It suits bespoke designs because any size or window layout is possible. Most Irish garden room builders work this way. Quality depends on the details: treated timber, a breathable membrane, a vapour control layer and a properly finished roof.
SIPs panels
Structural insulated panels are a thick layer of rigid insulation bonded between two boards. The panels form the walls, and often the roof and floor, in one piece. They give high insulation for a given wall thickness and go up quickly. Some of the larger Irish suppliers build their year-round rooms this way.
Steel frame
A light steel frame replaces timber studs, then gets insulated and clad like any other room. Steel is straight, strong and immune to rot, which makes sense in a damp climate. The risk is cold bridging: steel conducts heat, so without a thermal break, the frame can cause cold spots and condensation inside. Ask how the supplier deals with it.
Log cabins
Walls made of interlocking solid timber logs, often 28 to 70 mm thick. They are usually the cheapest option and can look lovely. But solid timber alone insulates less than an insulated frame, and floor and roof insulation are often extras. Logs also shrink and settle over the first year, so doors and windows may need adjusting. They suit summer and occasional use better than a daily office unless upgraded.
Cladding choices
See the full cladding guide for upkeep and costs.
- Thermally treated or pressure-treated softwood: affordable, needs regular oiling or staining.
- Cedar: naturally durable and weathers to silver grey.
- Charred larch (shou sugi ban): dark, striking and low maintenance.
- Composite: very low maintenance, with a less natural look.
If the room is at the side of the house, planning rules say its outside finish must match the house. In the back garden, any cladding is fine.
Second-hand garden rooms
Common questions
What is the best material for a garden room in Ireland?
There is no single best. Insulated timber frame is the most common and flexible. SIPs panels are quick to build and well insulated. Steel frames resist rot and stay straight. Whatever the frame, what matters most in the Irish climate is insulation, a good roof membrane and detailing that keeps water out.
Do metal garden rooms get condensation?
They can if the steel frame is not separated from the inside by insulation (a thermal break). Well-designed steel garden rooms are insulated and lined just like timber ones. Ask the supplier how they prevent cold bridging.
Is a second-hand garden room worth buying?
Sometimes, for a simple cabin. Most garden rooms are built in place and are hard to move without damage. Factor in dismantling, transport, a new base, electrics and repairs, and check the condition of the floor and roof.
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