Prices, honestly
What’s the real price, and what’s not included?
We’d rather show our guide prices early than make you hunt for them at the bottom of the page. These prices are for the insulated shell, before any site-specific groundworks.
| Size | Typical market price | Woodera |
|---|---|---|
| 3×3m (9m²) | £18,540 | £13,860 |
| 4×3m (12m²) | £22,740 | £18,480 |
| 5×4m (20m²) | £30,800 | £28,800 |
| 6×4m (24m²) | £36,960 | £34,960 |
Minimum office size: 3×3m (9m²) — compact, but still a genuinely insulated year-round room.
The numbers are clear — now see which life the room could hold.
What will yours be?
A garden room becomes believable when you can picture an ordinary Tuesday inside it. Not a catalogue label. Not a moodboard. A real use, in real weather, in your actual week.
Office, wellness room or escape room — the shell is the constant. The life inside it is the brief.
The Office
Warm at 8am in February. Quiet enough for calls. Near enough to the house to feel easy, far enough away to let the workday begin properly. For people who need the room to earn its keep every weekday.
The Wellness Room
Sauna, gym, cold plunge, or simply a room that helps the day end well. The same shell, designed around heat, ventilation, moisture and the habit you actually want to keep.
The Escape Room
Music, games, making, reading, evenings outside the main house without leaving home. A room that gives the house its breathing space back and still feels part of one life, not a second address.
Different lives, one shell — here is what that shell is made of.
SHARED SHELL, IN PLAIN ENGLISH
One envelope. Three different lives inside it.
Before we talk about desks, sauna heaters or hobby storage, we start with the same year-round shell in plain English.
| Element | What it means in practice | Why it matters across all three uses |
|---|---|---|
| Walls and insulation | 140mm timber frame, mineral wool to current Part L, structural sheathing, breather membrane, vertical oak cladding. U-value 0.18. | The room stays usable in January, not just pleasant in May. That matters whether you are working, heating a wellness room, or using it after dark. |
| Glazing | Triple-glazed, low-e, argon-filled, warm-edge spacer. | You keep light without giving away heat, and the room feels settled rather than echoey or exposed. |
| Floor and threshold | Engineered oak board, factory-oiled finish, level access where the site allows. | The room feels like part of home rather than an outbuilding you tolerate. |
| Electrical setup | Separate consumer-fed supply, sockets and lighting designed around the brief, not added as an afterthought. | An office needs reliable power, a wellness room needs heat and extraction, and an escape room often needs more flexibility than a standard garden shed ever allows. |
| Ventilation and moisture control | Details adjusted around the room use, with the envelope doing most of the hard work before gadgets and fixes are added later. | That is the difference between a room you still enjoy in year three and a room that starts to feel tired after the second winter. |
| Delivery and installation | Design, production, delivery and installation coordinated by one team. | Fewer handovers, fewer crossed wires, and a room that arrives as one thought-through project instead of five separate trades. |
The build is proven — next, check whether it fits the rules.
Trust strip
Proof that the project is protected
Your cover does not rely only on Woodera staying in business. The structure is protected beyond the handover itself.
Company cover in place while work is being carried out on site.
A public company profile that lets people check who they are dealing with before they enquire.
Protected and accountable — here is the easiest way to begin.
Most people start in one of three places
Not with a CAD file. Not with a formal brief. Just with the part of life that needs a better room.
“I know how I want to use it.”
That is enough to begin. Tell us office, wellness or escape, and we shape the room around the week you want it to hold.
“I know what I can spend.”
We can work back from that too. An honest budget is a stronger starting point than a vague dream room with no edges on it.
“I know the garden is the constraint.”
Access, levels, neighbours, trees and boundary distances often decide more than Pinterest ever will. We design around the site, not against it.
Ready to explore your version? — build the room around your brief.
Build yours.
Everything below changes the price on the right. Regulatory costs are shown separately — they're not optional extras, they're what Building Control requires, and every quote includes them honestly rather than hiding them until later.
Size
Larger extensions cost less per square metre — foundations and roof are the same fixed cost whether the room is 12m² or 30m².
Ground conditions
We confirm this with a site visit — this is a starting estimate. Clay-heavy ground, common in parts of Milton Keynes, needs a deeper or different foundation.
Roof
Doors and glazing
Interior finish
Kitchen or bathroom fit-out
Separate from the build itself — priced on top if you want us to fit it as part of the same project.
What Building Control requires
These aren't optional extras — Building Control won’t sign off an extension without them. We include them in every quote so there's no surprise bill halfway through.
FAQ
Still unsure? Start here.
No. That usually becomes clearer once we talk through how you want to use the room, what the site allows and what your week actually needs from it.
The core year-round shell is the constant. What changes is the specification around ventilation, power, heating, glazing, layout and internal fit-out.
Often, no. Most garden rooms fall under permitted development if they stay within the usual height, position and garden coverage limits. See the planning block above for the plain-English version.
Installation can be about a week once everything is ready, but the full project — including checks, production and site preparation — is more honestly described as around 6–10 weeks.
Yes, within reason. Some rooms work as an office in the day and a quieter retreat in the evening. The right answer usually comes from layout and services rather than forcing one label on the room forever.
If the space needs to behave like part of the house all day, every day, or must connect directly to the internal circulation, an extension may be the better route. That is exactly why we keep both conversations open.