Foundations · power · heat
Foundations, power and heat
A ground screw base is €90 to €110 a m², and the power cable from the house from €15 a metre. Electrical work must, by law, be done by a Registered Electrical Contractor, who gives you a completion certificate.
Free, no obligation. One local company prices it, not five.
The base
Three kinds of base
- Ground screws: steel screws wound into the ground, a frame on top. Quick, little digging, good on a slope.
- A concrete slab: dug, shuttered and poured. Takes the most load, so it suits a gym. Needs days to cure.
- Pads and a timber frame: concrete pads at the corners and along the sides.
Power
Getting power to the room
An armoured cable runs underground from the house's fuse board to a small board in the room, priced by the metre, so the distance from the house matters. A Registered Electrical Contractor does the work and gives you a completion certificate. Keep it with the room's paperwork.
Heat and water
Heating, water and a toilet
A panel heater is the usual heat. Water and a toilet mean a pipe and a drain connection, which add cost and, with a shower, make the room look more like somewhere to live. Under Class 3 it can't be lived in.
Extras
What else goes on the bill
The extras a room-only price leaves out.
| Job | Typical cost | What moves the price |
|---|---|---|
| Ground screw base | €90 to €110 a m² | Slope and ground |
| Power cable from the house | from €15 a metre | Distance to the fuse board |
| Flooring and heating package | €580 to €1,500 | Floor finish, heater type |
| Painting, inside and out | €1,000 to €1,800 | Size, colours |
| Plumbing | €1,000 to €2,500 | Distance to the drains |
| Heating | €1,000 to €5,000 | Panel heater up to a heat pump |
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Questions
Questions people ask
Does a garden room need foundations?
Yes, a level, stable base: ground screws, a slab or pads. A cabin on soft ground moves, and the doors stop closing.
How much is it to run electricity to a garden room?
From €15 a metre for the cable; the electrician prices the board, sockets and lights on top.
Can I put a toilet in a garden room?
Plumbing runs €1,000 to €2,500. Drainage depends on where the house's drains run.
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