A garage kitchen extension uses an integral or attached garage beside the kitchen to make the kitchen bigger, usually by opening up the wall between them to form an open-plan kitchen-diner. The work normally needs Building Regulations approval and often involves a structural opening, new drainage, extract ventilation and a floor raised to match the house. We look at the wall, the services and the floor levels first, then explain what the layout will need.
What is a garage kitchen extension?
Many homes across Liverpool have a small kitchen at the back and a garage right beside it, especially on post-war and later estates where the garage was built into or against the side of the house. Rather than extending into the garden, the garage space is taken into the kitchen. The result might be a larger kitchen with an island, a kitchen-diner with room for a family table, or a kitchen that moves into the garage so the old kitchen becomes a dining or sitting area.
It is one of the more involved types of garage conversion across Merseyside because a kitchen brings together structure, water, waste, power, gas and fire safety in one room. Getting those right is what makes the room work.
Which layout suits your house?
| Option | What it means | Main things to plan |
|---|---|---|
| Knock through and extend | Open the wall and add the garage floor area to the existing kitchen | Structural opening, floor levels, fire route through the house |
| Move the kitchen into the garage | New kitchen in the garage; old kitchen becomes dining or living space | New drainage and gas routes, extract ventilation, more services work |
| Kitchen plus utility | Part of the garage extends the kitchen, the rest becomes a utility | Partition wall, two sets of waste connections |
If a separate laundry space appeals more than a bigger kitchen, our garage to utility room page covers that option.
Opening up the wall between kitchen and garage
The wall between an integral garage and the kitchen may carry floor joists, a first-floor wall or part of the roof. Taking it out, or forming a wide opening in it, normally needs a beam or lintel sized by a structural engineer, with temporary support while the work is done and building control checking the calculations and the work on site. Where the garage has brick piers or single-skin walls, these are checked too, because removing piers weakens a single-skin wall unless it is tied into a new inner leaf.
Never cut into or remove a wall between a garage and a house yourself. It can be load-bearing, and in an integral garage it is usually part of the fire separation as well.
Our integral garage conversion page explains more about how these garages are built and what changes when they become part of the house.
Fire safety in an open-plan kitchen
Before the conversion, the wall and door between an integral garage and the house normally act as fire separation. Once the garage becomes a kitchen, that changes, and a kitchen is where fires most often start. Open-plan layouts also affect escape routes: if the hallway or stairs are opened up to the kitchen, building control will look at how people upstairs would get out in a fire. That might mean keeping doors to the hall, adding or upgrading smoke and heat alarms, or adjusting the layout. Any room reached only through the new kitchen may need an escape window. Building control confirms what is needed, and fire doors should never be removed without their agreement.
Drainage, gas and electrics
A sink, dishwasher and washing machine all need waste pipes with a proper fall to the drains. In a garage beside the kitchen the existing waste may only need extending, but moving the kitchen to the front of the house can mean a longer run and possibly a new connection, which falls under Part H. A gas hob or cooker must be connected by a Gas Safe registered engineer. Electrics usually include a cooker circuit, ring or radial circuits for appliances and new lighting; this is notifiable work for a registered electrician, who issues an Electrical Installation Certificate. See our plumbing and heating and electrics for conversions pages.
A kitchen also needs extract ventilation under Part F, normally a cooker hood ducted outside or an extract fan, plus openable windows and background ventilation. The duct route through the infill wall or roof is easier to plan before the walls are lined.
Getting the floor level right
Garage floors are often lower than the house floor and are usually plain, uninsulated concrete. For a kitchen to feel like one room, the new floor normally takes a damp-proof membrane lapped to the wall DPC, rigid insulation and a screed brought up to the level of the existing kitchen. That is also the moment to decide on underfloor heating and to run any pipes or cables that will sit under the floor, such as a waste pipe to an island sink. Our floor insulation and levelling page covers this build-up.
Light and warmth in the new space
The old garage door opening is usually infilled with a new wall, and in a kitchen that wall often takes a window over the worktop. With a flat garage roof, rooflights can bring daylight into the deepest part of the room. LABC guidance gives target U-values for conversions: 1.4 W/m²K for windows and doors and 2.2 W/m²K for rooflights, with walls, floor and roof insulated to their own standards, so glass and insulation are planned together. Radiators can often be extended from the existing heating, or underfloor heating used.
What happens when you get in touch
We ask what type of garage you have, how old the house is roughly and how you want the kitchen to work. On the visit we look at the dividing wall, the floor level, where the drains and gas run and the state of the garage roof. Drawings are prepared by an architect or architectural technician, usually with structural calculations for the opening, and we explain the planning check and Building Regulations route before giving a written quote. Areas with plenty of estate houses with integral or attached garages, such as Hunts Cross, Maghull and Widnes, are typical of where this kind of project makes sense.
Planning a bigger kitchen?
Call 07777 659786 or leave your details. We will talk through whether your garage can become part of your kitchen and what our full garage conversion service would involve.
Frequently asked questions
Do I need planning permission to turn my garage into a kitchen?
The Planning Portal says planning permission is not usually needed where the work is internal and does not enlarge the building. Some homes have had permitted development rights removed, often on newer estates, and conservation areas and listed buildings have extra checks. Ask your local planning authority before you commit, and read our planning guide.
Is the wall between my kitchen and garage load-bearing?
It may well be, especially in an integral garage with a bedroom above. Only a proper inspection and, usually, a structural engineer's calculations can confirm it. Building control then checks the beam or lintel and its supports. Please do not open up the wall to look, as it may also form fire separation between the garage and the house.
Can I have an island with a sink in a garage kitchen?
Often yes, if the waste pipe can run under the new floor with enough fall to reach the drains. Raising the garage floor to the house level usually leaves room for it. The route needs planning before the screed goes down, and new drainage is checked by building control under Part H.
How long does a garage kitchen extension take?
It depends on the structural work, the drainage and the kitchen fitting itself. Rated People's guide suggests conversions with heavy structural or plumbing work take around 6 to 8 weeks on site, and drawings, approvals and kitchen ordering add time beforehand. We give a realistic timescale after the visit.
Will I lose my parking if I convert the garage?
You lose the garage space but usually keep the driveway. Some estates have planning conditions that require off-street parking, so check your property's planning history with the council. Changes to a dropped kerb need council approval. Our cost guide also helps you weigh up the project as a whole.