Insulated Garden Offices: Warm in January, Usable All Year

An insulated garden office has insulation in the walls, the floor and the roof, double or triple glazing, and no gaps for draughts. In Ireland one costs €6,700 to €10,500 for a one-desk pod and €13,390 to €16,720 for 12 to 16 m², put up. A fully insulated, fully fitted office of that size is €25,250 to €27,500. Without the insulation it is a summer room.

What separates an office you can work in all winter from a shed with a desk in it.

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50, 70 or 100 mminsulation, by how much you use it
€13,390 to €16,72012 to 16 m², put up
€20 to €40a month to heat in winter

Charred black timber cladding with a reeded glass window, a door and a wall lamp — Dark timber cladding, a window and a door. What matters is behind the boards: the insulation, the membrane and the air gap.

The four places heat leaves

Where	What to ask for	Why
The floor	Rigid insulation between or under the floor frame	A small building stands on cold air. The floor is the first thing you feel.
The walls	Insulation the full depth of the frame, with a breathable membrane outside it	Most of the surface area is wall.
The roof	At least as much insulation as the walls	Warm air rises, and a flat roof is one big panel.
Glass and doors	Double glazing at least, sealed frames	A wall of single glass undoes the insulation beside it.

How much insulation

Insulation is sold by thickness. As a guide:

50 mm suits a room used now and then, or mostly in the warm half of the year.
70 mm suits a desk used every working day.
100 mm is the top tier, for full days through winter and the colder counties.

How cold it is where you live matters. Letterkenny in Co. Donegal has 2,211 heating degree days a year and Tralee in Co. Kerry has 1,673. The same office needs about a third more heat in the first than the second. Your county's figure is on its page.

Log walls, panels and frames

Solid log walls insulate a little by their thickness alone. On their own they are not enough for a winter desk: ask what is added to the walls, floor and roof.
Insulated panels (SIPs) are two boards with rigid insulation bonded between them. They go up fast and leave few gaps.
A timber frame filled with insulation and lined inside is how most fully fitted offices are built.

Any of the three makes a warm office. What matters is the thickness, the floor and roof getting the same care as the walls, and the joints being sealed.

Damp is the other half

A warm room in a wet garden makes condensation. A breathable membrane behind the cladding, an air gap under the floor, a trickle vent in a window and a heater on a low setting through winter keep paper, books and screens dry. Ask how the building is ventilated when it is shut.

Insulated offices, priced

What	Typical cost	What moves the price
A one-desk office pod, 6 to 9 m²	€6,700 to €10,500	3 × 2 m up to 3 × 3 m. Insulated timber, put up. Base and power extra
An office for two desks, 12 to 16 m²	€13,390 to €16,720	4 × 3 m to 4 × 4 m. The insulation, the doors and the glass
A 20 m² office, 5 × 4 m	€15,200 to €22,000	Triple glazing and thicker insulation sit at the top
A 24 to 25 m² office	€17,150 to €28,000	6 × 4 m or 5 × 5 m. How thick the insulation is
Fully fitted, 12 to 16 m²	€25,250 to €27,500	Insulated, wired, lined and floored, ready to work in
Heating it in winter	€20 to €40 a month	Insulation, hours of use, the heater

Our price guide for Ireland. Ask whether VAT is in the price. Many list prices leave it out. Ask what the price includes: the base, the cable from the house and the inside finish.