Kitchen Rear Extensions
A kitchen rear extension is one of the most popular ways to turn a cramped room into a bright, open-plan kitchen-diner that connects to the garden. It adds both practical space and day-to-day comfort without needing to move house.
We design and build kitchen rear extensions that combine structural changes, glazing, and careful layout planning so the new space works in practice, not just on paper.
Turn a small kitchen into the heart of your home
Most kitchen rear extensions project 3-6 metres from the back of the property and run the width of the house, creating an open-plan kitchen-dining area with better light, storage, and circulation.
Kitchen-diner layouts
Single-storey kitchen rear extensions are often used to create one connected kitchen-diner, with the cooking area at the centre and dining or seating space nearer the garden.
- Kitchen and dining table on the same level.
- Island or peninsula separating cooking and seating zones.
- Direct access to patio or garden through wide doors.
Adding a utility or boot room
Where footprint allows, kitchen rear extensions can incorporate a separate utility or boot room so laundry, coats, and everyday clutter have a defined place.
- Dedicated storage and laundry space.
- Improved day-to-day organisation.
- Cleaner main kitchen area with fewer appliances on show.
Key benefits of a kitchen rear extension
Kitchen extensions remain one of the most popular home improvements in the UK because they improve how homes work day to day as well as adding potential value.
Better everyday living
More space around the kitchen makes cooking, eating, and socialising easier. Families can share the same room without feeling crowded.
More natural light
Rear extensions combine rooflights, lanterns, and full-height glazing to bring daylight deep into the room so it feels brighter throughout the year.
Connection to the garden
Bifold or sliding doors create a stronger connection between the kitchen and outdoor space, which is particularly valuable in spring and summer.
Space to entertain
A kitchen-diner layout gives you room for larger tables, islands, or informal seating areas, making gatherings and family occasions more comfortable.
Tailored storage
Extended kitchens can accommodate more cabinetry, pantries, and built-in storage, which reduces clutter and improves usability.
Potential value uplift
UK extension guides often cite kitchen extensions as one of the strongest ways to add potential value to a home when they are planned and executed well.
How much does a kitchen rear extension cost?
Kitchen extensions typically cost more per square metre than non-kitchen rear extensions because of the fit-out. You need to budget for the extension shell and the kitchen itself separately.
Typical UK cost range
Recent UK cost guides put many kitchen extensions in the £35,000-£70,000 range, depending on footprint, finish level, and region.
Shell vs kitchen budget
A kitchen alone can easily cost £10,000-£25,000 once cabinetry, worktops, appliances, and electrics are included, so it should be itemised separately from the extension shell.
Square metre benchmarks
Most UK extension cost calculators suggest single-storey extensions fall roughly between £1,500-£2,500 per m² before premium finishes, with kitchen extensions often at the higher end because of their specification.
Popular kitchen rear extension layouts
Most successful kitchen rear extensions follow a handful of proven layout patterns. Choosing the right one depends on your plot, budget, and how your household uses the space.
Classic kitchen-diner
A straightforward single-storey rear extension projecting 3-4 metres, with the kitchen along one wall and the dining table nearer the garden doors.
Island-centred layout
An island or peninsula sits between the cooking zone and seating area, providing extra worktop space and a natural gathering point.
L-shaped wraparound kitchen
Rear and side-return elements combine to create an L-shaped layout, often with a separate utility or storage zone away from the main kitchen.
Kitchen with snug or seating nook
A seating area with sofas or built-in benches makes the space more versatile for everyday use and guests.
Orangery-style kitchen extension
Brick or render piers with large glazed panels and a lantern roof combine traditional solidity with modern glazing.
Kitchen plus utility wall
A continuous run of tall cabinets combines pantry storage, fridge space, and laundry appliances along one side, keeping the main kitchen clean.
Planning rules for kitchen rear extensions
Kitchen extensions follow the same core rules as other rear extensions. Whether you can avoid a full planning application depends on depth, height, property type, and local restrictions.
Permitted development basics
Many single-storey kitchen rear extensions can be built under permitted development rights if they stay within depth, height, and garden coverage limits, and the property still has its PD rights.
- Depth usually up to 3m for attached and 4m for detached houses as a standard limit.
- Extensions must not exceed 50% of the original garden area when combined with other structures.
- Side elements and wraparound layouts need separate checks on width and height.
Larger home extension and planning routes
Deeper kitchen extensions may use the larger home extension prior approval route, or require a full householder planning application where PD limits or local restrictions are exceeded.
- Prior approval route for deeper single-storey rear extensions on suitable plots.
- Full householder planning application where rights are removed or rules are exceeded.
- Lawful Development Certificates often used to confirm PD status formally.
Kitchen rear extension FAQs
How much does a kitchen rear extension cost?
Recent UK guides put many kitchen extensions in the £35,000-£70,000 range depending on size, region, and specification. The upper end increases with higher-end kitchens, glazing, and flooring.
Is the kitchen itself included in the extension quote?
Not always. Many cost examples separate the extension shell from the kitchen fit-out. Kitchens alone often run £10,000-£25,000, so it’s important to confirm exactly what each quote covers.
Do I need planning permission for a kitchen rear extension?
Sometimes. Many single-storey kitchen rear extensions can be built under permitted development if they meet depth, height, and other conditions and the property still has its PD rights. Deeper or more complex schemes may need prior approval or full planning.
How long does a kitchen rear extension take?
Build time for a single-storey kitchen rear extension commonly falls around 8-12 weeks on site, with additional time for design, approvals, and finishing trades depending on specification.
What affects the cost most?
The main cost drivers are footprint, structural changes, glazing specification, kitchen choice, and ground conditions. Open-plan layouts with large steel spans and premium kitchens will cost more than simple infill extensions with modest cabinetry.
Ready to plan your kitchen rear extension?
Share a few details about your current kitchen and the extension you have in mind. We’ll help you understand realistic budget ranges, planning options, and layout ideas for your home.