Anyone needing more space at home eventually asks the same question: build out into the garden with a house extension, or build a separate garden room instead. We fit garden rooms as one of our core services, so we obviously have a view, but we try to give people the full picture rather than push one answer regardless of their situation.
The right choice depends heavily on what the room is for, how your garden and house are laid out, and how much disruption you can tolerate while the work goes on. Below we have set out the main things worth weighing up.
Planning permission in general terms
Many garden rooms fall under permitted development rules, meaning no planning application is needed provided they meet certain conditions on height, position and how much of the garden they cover. This is not guaranteed for every property, particularly listed buildings or those in conservation areas, so it always needs checking against your specific plot, but it is a genuine advantage garden rooms often have.
House extensions can also fall under permitted development in some cases, but larger single storey rear extensions, and almost all two storey ones, typically need a full planning application. That means drawings, a decision period measured in weeks, and the possibility of objections from neighbours, none of which apply to most garden rooms.
Cost as a broad comparison
As a guide only, a garden room of a reasonable size, insulated and finished to a good standard with power and heating, tends to sit somewhere in the mid to high thousands depending on size and specification. A traditional extension of a similar footprint usually costs more once you account for foundations, roof tie ins, matching brickwork and building control fees, often running well into five figures.
That gap narrows if the extension is small or the garden room is large and heavily specified, so these figures should only be used as a rough starting point for your own conversation with us, not as a quote.
Disruption to daily life
This is where garden rooms have a clear practical edge. Building work happens away from the house itself, so there is no scaffolding against your walls, no dust sheets through the kitchen, and no weeks of living with a hole in the side of the building. Most households barely notice a garden room going up beyond activity visible through the window.
An extension, by contrast, usually means living alongside building work for a good number of weeks, sometimes longer if it involves knocking through to existing rooms. For families with young children or anyone working from home, that disruption is a real cost even if it does not show up on the invoice.
Using the space as an office or gym
Garden rooms suit home offices and home gyms particularly well because they create genuine separation from the house. Closing the door on a working day, or walking out to train without disturbing the rest of the household, matters more to people than they expect until they have it.
That separation is harder to achieve with an extension, which usually remains part of the connected internal layout of the house. If the whole point of the new space is to feel like a distinct zone away from domestic life, a garden room tends to deliver that better.
- Garden room: usually simpler planning route, separate from the house, less disruption
- Extension: adds directly to the house footprint and internal floor area, larger jobs
- Garden room: good for offices, gyms, studios and guest space
- Extension: better where you need the new space to connect directly to existing rooms
Heating and year round use
A garden room built properly, with a decent level of insulation in the floor, walls and roof, and a suitable heating source, will function comfortably all year round, not just as a fair weather summerhouse. We build ours to be used in January as readily as in June, which is really the whole point if you are relying on it as a working office or gym rather than an occasional den.
Where garden rooms fall down is when they are built to a lower specification without proper insulation, and then feel cold and damp for half the year. It is worth asking any supplier directly what insulation values they are using in the floor, walls and roof, because this is where cheaper builds cut corners that you will feel every winter.
Connecting the garden room back to the house
Power, data and sometimes water need running from the house to the garden room, usually via an armoured cable buried at the correct depth. This is a straightforward part of most garden room installs and something we handle as part of the build rather than leaving you to sort separately.
It is worth thinking early about whether you want heating, lighting, sockets and internet in the room, because retrofitting extra cabling after the base and structure are in is far more disruptive than including it from the start.
Talk it through with us
If you are weighing up a garden room against a bigger extension project, give us a call on 02380 201687 or 07833 227576, or email info@vipwalls.co.uk. We can talk through your garden, your budget and what you actually need the space for, and give you an honest steer, even if that steer is toward an extension rather than one of our own garden rooms.
Common questions
- Do I need planning permission for a garden room?
- Many garden rooms fall under permitted development and do not need a full planning application, but this depends on your property, its size and position in the garden, and whether you are in a conservation area or have a listed building. We check the specifics for your plot before starting.
- Is a garden room cheaper than an extension?
- Generally yes for a comparable footprint, mainly because there is no need for foundations tied into the existing house, matching brickwork or the same level of building control involvement, though exact costs depend on size and specification.
- Can I use a garden room in winter?
- Yes, provided it is built with proper insulation in the floor, walls and roof and has a suitable heat source. We build ours for year round use rather than as summer only spaces.
- How long does a garden room take to build compared to an extension?
- Garden rooms are usually much quicker, often a matter of weeks from base to finished room, whereas extensions can take several months once design, planning and construction are all accounted for.
- Can a garden room be used as a permanent home office?
- Yes, this is one of the most common uses we build for, with proper insulation, power, heating and often data cabling run from the house so it functions as a genuine working space.
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