Knowing how much a kitchen extension costs before you embark on your home improvement is vital. It will allow you to draw up a budget that includes all the elements this project entails so you can create the room you’ve been dreaming about.
Increasing the size of your kitchen is a popular way of extending a house, allowing you to say goodbye to a cramped cooking space that doesn’t connect with the garden and instead enjoy a spacious, light-filled modern room that’s a pleasure to cook in, has room for dining, and is a great place to spend time with friends and family.
There are many different factors that influence how much a kitchen extension costs from the building work to professional fees, any necessary permissions, and more, and our guide will provide the information you need on all of them. We’ll also let you know how you can make your money go further.
Single Storey Kitchen Extensions: An Amazing Inspo Gallery
You can check out our extension cost calculator below, too, which will give you an estimate of what your kitchen extension will cost you wherever you live in the UK.
How much it costs to expand a kitchen all depends on how much work you plan to do. As well as build costs and professional fees, there will likely be the cost of applying for planning permission and getting building regulations approval to include also. Finally, you need to budget for the kitchen itself, including flooring and decoration.
When you are setting a budget for your kitchen extension, there will be a certain amount of flex in each stage, so we have broken the project down into cost areas.
Guide To Kitchen Extensions: From Concept To Creation
Our expert tips provide all the information you need to achieve your ideal kitchen extension, while ensuring you set a realistic budget (and then stick to it), and you can find plenty of inspiration among our kitchen extension ideas under £200k and kitchen extension ideas for period homes.
Single storey extensions: ‘For a single storey extension expect to pay £1, 850 to £2, 300 plus VAT depending on size and specification, ’ says Emma Kemp at iFurb.
Fitting bespoke windows and doors: ‘There are many variations on bespoke windows and doors, however, prices for bespoke windows and doors can be up to £1000s per unit, ’ says Emma.
Kitchen Extension Ideas: How To Plan Your Extension
Planning a conversion? A garage conversion will cost £1, 000 to £1, 250 per m²; cellar conversions, cost from £1, 150 to £1, 850 per m²; new basement conversions cost between £3, 000 and £5, 000 per m².
Extra foundation costs will be incurred by difficult ground conditions, such as clay, peat, nearby trees or slopes. Ask a structural engineer (find one at istructe.org) and your local authority building control for an idea of likely foundation type.
Top tip: ‘Small extensions under 15 to 20m² achieve no economies of scale, so costs are higher per square metre, ’ says experienced renovator Michael Holmes.
Beautifully Designed Kitchen Extensions In London
The fee for construction drawings that are sufficient to build from (and for building regulations approval) will typically cost the same as planning drawings at around £2, 700.
Structural engineer’s fees will range from £800 and are necessary to design the foundations, roof, any large span openings and structural alterations to the existing house.
You can use our extension cost calculator to estimate how much adding a kitchen will cost you in your area when drawing up your budget, but bear in mind there are ways to cut the cost of an extension.You will also want to investigate ways to cut the cost of the kitchen itself.
Morningside Kitchen Extension
‘Gather multiple quotes for the work before hiring any tradespeople, so you can be sure you’re getting the best deal, ’ recommends Gregory Smith, property and construction expert at PriceYourJob. ‘Keep the extension within permitted development to avoid added planning costs (see below) and keep the design simple to minimise the need for complex structural work. This will bring down the cost of materials and labour.
‘To lower the cost of fixtures and fittings, choose basic kitchen carcasses and finish with quality doors and worktops. Most kitchens come in flatpack form, so you could fit these yourself to lower costs further.’
Michael Holmes advises, ‘Agreeing an all-in rate, plus reasonable expenses and disbursements, gives greater control of costs for planning and construction design.
Kitchen Extensions East London
'If the architectural designer is retained to help put the project out to tender and appoint the builder under a formal contract, as well as to provide contract administration services, the fee will typically be a further three to seven per cent of the total contract value.'
Using standard building materials will help to keep the total lower as builders will be able to negotiate better deals. Doors and windows in regular sizes rather than bespoke will reduce costs. But that doesn’t mean you can’t be creative when you design an open plan kitchen diner, for example by exposing roof trusses for an impressive ceiling, using an interesting bond pattern for bricks or, as here, setting bricks on end.
As for the cost of the kitchen itself? ‘A modest budget should never be an obstacle in achieving the kitchen of your dreams, ’ says Ruth Lavender, design expert at Benchmarx Kitchens. ‘Advancements in the manufacturing of today’s kitchens have created endless opportunities to recreate high-end looks at cost-effective prices. Simply choosing clever combinations of cabinetry, worktops, lighting and appliances make it possible to create an expensive feel without overstepping on costs.’
Kitchen Extensions: Costs And Benefits
Let’s assume you have set a budget of around £22, 200 for an extension measuring 4m x 3m at £1, 850 per square metre, plus a new kitchen cost of £10, 000. Always add in at least another £3, 220 as a 10 per cent contingency should anything unforeseen occur.
You may be able to take advantage of permitted development rights for extensions and extend without planning permission, which will save you money and time as well.
If you take this route, it’s still worth getting a certificate of lawful development, which costs £103 in England. This is useful when you come to sell as you will be able to show that your kitchen extension did not require planning permission.
Designing An Extension For Your Dream Kitchen
Mulroy Architects addressed the challenge of small, dark ground floor rooms in this double-fronted Victorian home in Crouch End, London, by adding a large rear extension under permitted development, creating a light-filled interior.
Fees for building regulations approval will depend on the size of extension. ‘Single storey would cost around £350; £550 for double storey both with a private building control company, ’ says Emma.
‘You should always ask your builder which building control company they like to work with as having a strong relationship with your inspector can help avoid delays on site and added costs, ’ she advises.
Side And Rear Extensions
A chartered surveyor can arrange party wall agreements for your kitchen extension. ‘Costs depend on how complicated it is and if a party wall surveyor is required could be up to £1, 000 plus VAT, ’ says Emma.
There are ways to save. ‘If your neighbour formally consents to the works, you can avoid having a party wall settlement and save on the fees, ’ says Michael; the government’s planning portal has details.
Kitchen extension design can be anywhere from £17 per m² to £144 per m², bearing in mind that costs can be much higher for a bespoke option. The costs of the design work may be included in what you spend on the kitchen itself, or reflected in your total architect fees.
Tips On Planning And Designing A Kitchen Extension
Whether yours is a period home or a contemporary one, you may well want to include bi-fold or sliding doors in your kitchen extension design. So what should you expect to pay? Expect to pay an average of £3, 825 for aluminium bifold doors and £3, 000 for aluminium sliding doors, according to Checkatrade.
A kitchen lighting scheme from a specialist designer can be well worthwhile. ‘Operate ambient, accent and task lighting on different circuits, for control of zones and the freedom to alter the mood, ’ says Luke Thomas, associate at John Cullen, which charges from £102 per hour’s consultation.
Concrete flooring is on trend and hardwearing kitchen flooring. ‘It can be laid both internally and externally, giving spaces impact, ’ says Jonathan Reid, director of GreyMatter Concrete. Expect to pay from £120 to £144 per m² for a 50m² 10cm thick floor.
Kitchen Diner Extension Plan Help
Kitchen tiles are an excellent way to make a statement. ‘There are so many options, from rustic terracotta to hand-poured encaustic tiles, ’ says Harriet Roberts, co-founder of Bert & May, which offers reclaimed tiles, with prices starting from around £100 per m². However, if you shop at DIY sheds or larger chains, such as Topps Tiles, you can find wall and floor tiles for as little as £10 per m².
You’ll need to consider heating a kitchen in a new extension, and underfloor heating is an option. ‘If you have a relatively new and energy-efficient boiler, check whether it is powerful enough to handle the additional heating demand, ’ advises Michael Holmes. ‘If your boiler is more than 10 years old, consider replacing it, as a more energy-efficient design will help offset the cost.’
If you’re choosing a boiler, bear in
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