Garden Room With Kitchen Cost UK: 2026 Guide

Quick answer

A garden room with a kitchen typically costs £35,000-£60,000+ in the UK, depending on size, kitchen specification, and whether a bathroom is also included. A kitchenette (sink, small fridge, basic units) adds roughly £6,000-£12,000 to a base garden room cost, while a fuller fitted kitchen with cooking appliances, extended plumbing, and a larger electrical supply can add £15,000-£25,000 or more. See our Garden Room Cost UK guide for base costs before kitchen and plumbing are added.

Why a kitchen adds significant cost

A kitchen pulls in several cost categories at once, which is why it’s one of the biggest single additions to a garden room budget:

Plumbing and drainage — a kitchen sink needs the same drainage connection considerations as a bathroom (see our Garden Room With Bathroom Cost guide), either tying into your house’s existing system or using a pumped solution.

Electrical supply — cooking appliances (an oven, hob, or combination) draw significantly more power than lighting and general sockets, which often means a larger dedicated electrical supply from the house rather than the lighter circuit that suffices for an office or gym.

Ventilation — cooking requires proper extraction, adding ducting and an extractor unit to the specification.

Units, worktops, and appliances — this varies hugely by specification, from a simple run of budget units to a fully fitted, appliance-integrated kitchen comparable to an indoor renovation.

Kitchenette vs full kitchen: what’s the difference in cost

Kitchenette (roughly £6,000-£12,000 added) — a sink, small under-counter fridge, a run of base units, and usually a microwave or single induction hob rather than a full cooking range. Suits a garden room used for guests, an Airbnb let, or occasional extended stays rather than full daily living.

Full fitted kitchen (roughly £15,000-£25,000+ added) — full-size fridge/freezer, oven and hob, extractor, dishwasher in some specifications, and a complete run of fitted units and worktops. This is closer to what’s needed if the garden room functions as genuinely independent living space — see our Garden Annexe Cost guide for when a kitchen-and-bathroom combination tips a project into annexe territory.

Building regulations and planning considerations

Adding a kitchen doesn’t automatically trigger planning permission on its own — most garden rooms with a kitchen still fall under permitted development provided they meet the standard rules (see our Garden Room Planning Permission guide). However, a kitchen combined with a bathroom and independent access is the clearest signal that a space has become self-contained living accommodation rather than incidental use of the main house — at which point planning permission is much more likely to be required, and the building regulations picture changes substantially too (see our Garden Room Building Regulations guide). If your plan includes a kitchen, it’s worth having this conversation with your garden room company or a planning consultant before finalising the design.

Common use cases for a garden room kitchen

Airbnb or guest accommodation — a kitchen is close to essential if you’re renting the space out or hosting guests for more than a night or two. See our Garden Room for Airbnb guide.

Granny annexe / multi-generational living — a kitchen alongside a bathroom is usually the defining feature that makes a garden room function as genuinely separate accommodation for a family member.

Garden bar or entertaining space — a lighter kitchenette specification (sink, small fridge, worktop space) is common here rather than a full cooking kitchen — see our Garden Bar Cost guide.

Ways to manage the cost

Decide kitchenette vs full kitchen early — this is the single biggest cost lever, and retrofitting a fuller kitchen after the room is built is considerably more expensive than specifying it upfront.

Position for shorter runs — as with a bathroom, positioning the garden room to minimise the distance to your house’s existing water, waste, and electrical supply meaningfully reduces groundworks cost.

Match appliances to actual use — a full-size oven and hob is unnecessary for a garden room used only occasionally; a compact combination microwave/oven and induction hob covers most realistic use cases at a fraction of the cost.

Frequently asked questions

How much does it cost to add a kitchen to a garden room? Roughly £6,000-£12,000 for a basic kitchenette, or £15,000-£25,000+ for a full fitted kitchen, on top of the base garden room cost.

Do you need planning permission for a garden room with a kitchen? Not automatically, but a kitchen combined with a bathroom and independent access is a strong signal of self-contained living accommodation, which is more likely to need planning permission — see our Garden Room Planning Permission guide.

Is a garden room with a kitchen the same as a granny annexe? Not necessarily — a kitchen alone doesn’t make a space an annexe, but a kitchen plus bathroom plus independent access typically does. See our Garden Annexe Cost guide for the distinction.

What’s the cheapest way to add basic cooking facilities to a garden room? A small kitchenette with a sink, compact fridge, and a single induction hob or microwave combination is the lowest-cost route, avoiding the larger electrical supply and extraction needed for a full cooking range.