How to design your kitchen extension by KPCl Architecture

December 3, 2018 | Author: | Posted in Kitchen
Kitchens are the heart of a household as it is the place where families; cook, eat, socialize, work and relax. Transforming a kitchen to an open plan space by having a rear extension on the ground floor can turn a kitchen space into a modern inviting area for entertaining. There are different routes depending on your property, from combining adjoining rooms or adding a conservatory to a building a completely new room or rear extension.

Small extensions might not need planning permissions as long as they are under the guidelines of the permitted development. Larger extensions, or addition to a flat, always need permission. As well as listed buildings always require consent, whether or not the work is permitted development.

Combining adjoining rooms

Converting two rooms into an open plan allows the family and guest to perform numerous functions together in the same space. This is great if you want to combine a kitchen-living room or kitchen-dining room to be able to entertain or even keep an eye on the children while cooking in the kitchen. Most kitchens are in the rear so with an open plan there is potential for more natural light into the space by adding a bi-folding door to the garden. There would be uninterrupted line of sight where you can still see everything while other people are performing other actives such as watching TV or kids playing. Open plan gives you a larger feel to the space as well as the kitchen becomes a focal point of the house as you walk in the property. A structural engineer will need to ensure that the wall that is being removed isn’t a load bearing wall. In the case the wall is a load bearing wall your structural engineer will need to do addition calculation for the type of RSJ (rolled steel joist) that will be acting as a supporting beam, this will be additional cost and might involve more disruption to the construction of your open plan kitchen.


A conservatory is an additional room to the house that is in the rear of the property on the ground floor looking out at the garden. The floor area for a conservatory doesn’t exceed 30m­­­­­­2 floor area and is thermally separated from the building it is attached to, also has an independent heating system from the main building. By adding a conservatory this could add value to your property to potential buyers especially if you have a south facing garden, a potential buyer wouldn’t mind paying more for the house if there is already a conservatory instead of undertaking the project themselves. A conservatory can be used as a new room to the house or an extension of an existing room, were it brings a lot natural light as the conservatory would be completely glazed.

Rear extension

If you have enough room in your garden extending out is a good option but it does cost a lot more than the other option for extending your kitchen. However having a kitchen rear extension means you can create your own dream kitchen and how you want the layout to be. Depending on the layout of your property there are different types of rear extensions:

Single Storey Extension

Single storey extensions are a simple extension built onto a part of the house where by one side (or more) of the extension is attached to the property on the ground floor at the back of the property in the garden area. This is a great way of adding more space to your existing kitchen, by having more room there could be a dining space, extra workspace or for a bigger area for appliances. The design of the roof should work with the overall look of your property, and if it will affect your neighbours sunlight.

Double Storey Extension

A two storeys or multi-storey extension is similar to a single story extension that is built to a part of the existing building. The possibly for neighbours to appeal against your extension is greater as it might be overlooking or blocking some of their natural light. We would strongly advice that you get a letter from the planning department before you start you construction and talk to your neighbour in case they do have some issues about it so they don’t feel left out. However, two storey extensions to your home give you that extra space on the ground floor and on the first floor as it could be additional bedroom or perhaps an en suite for the master bedroom. This extension will also increase your value to your property, if you decide to sell in the future.

Side Return Extension

Side return extensions are common choice for a Victorian or Edwardian era house. These houses usually have a gap at the side of the house, which is not often used and are called dead space. By adding a side return you are not taking anything from your garden space but are adding to the kitchen space that you already have, by adding skylights this will bring more light into the area and be utilising the dead space. This is the smallest type of rear extension which mean smaller job and cheaper than the other extensions.

Wrap-Around Extension

Wrap-around extension is the biggest out of the kitchen extension ideas, as it requires more work but they do add a larger space the property on the ground floor. A wrap-around extension is a side return and rear extension together in an L shaped space, there are two option for a roof it could be sloped or flat. This does give you the opportunity to completely open up the kitchen and have as much natural light coming from the top as well as having the full length view of your garden with bi-folding doors. You could even potentially add a utility room or a downstairs WC or a walk –in storage and use all the space available.


Planning permission

It is always best to contact your local planning officer first as they can suggest to you what will be appropriate. Planning regulations can vary from region to region but there is a set of planning developing guidelines (you can see on a previous blog; Essential guide for rear extension). Special consideration is needed for a property that is located in a Conservation area or a National Park as you’ll need to work closely with your council planning permissions to know exactly what modification you can do.


Planning the layout of your kitchen, you will need to keep in the back of your mind the basic necessities of each kitchen requirements (fridge freezer, sink, cooker) and then add all the other features that will go around them. How much storage is available to work with, and if you want certain worktops being used for different functions. Depending on how much area you have to work with, there are different styles of kitchen layouts that could be done.

Galley kitchen are the cabinets all in one line on one wall. This is done in small narrow kitchens.

Double Galley kitchen are where the cabinets are on two walls opposite each other. Narrow kitchen use this style to get enough storage and basics into the kitchen.

L-Shape kitchen layout is a popular layout in small and large kitchens as it offers good storage and provides a good effective working triangle.

U-Shape kitchen layout usually fitted for a medium kitchen and it can have the three main necessities (fridge freezer, sink, and cooker) all on their own side in the kitchen, giving this an excellent triangle working area.

Kitchen island is a great way to of breaking between the space and can be used a breakfast bar as well as additional storage, more worktops and another area for a sink or a cooker to be separate from the wall.


All the above extension are a different prices but as a general cost should estimate from £1,260 and £2,000m2for an extension that is plastered finish giving a cost of £25-50,000 for the foot print of around 25m2. The total cost of the project might vary depending on the specifications of the kitchen itself, pluming, electrics, materials and appliances.

This is why it is always good to sit down and consult with your designer about every detail you want in your extension especially starting off with your budget as they will be with you all the way through the development of your new extension

KPCL Architecture has been successfully delivering construction, property and architectural work throughout London and Greater London. Although having competitive prices we ensure that we supply the highest standards of work possible.

Our highly trained staffs ensure that the work is delivered on time to your satisfaction. We deal with an array of residential and commercial construction and architectural projects from major projects to minor, such as house renovation or other projects.

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About Author
KPCL Architecture has been established since 2007. Based in London, we cover all areas in London and Greater London having three offices around the city. KPCL has been successfully delivering Architectural projects throughout London and south of England. KPCL trades in a variety of things such as: Construction Design, Planning, Design Construction & Project management etc.


KPCL Group has been successfully delivering construction, property and architectural work throughout London and Greater London . Although having competitive prices we insure that we supply the highest standards of work possible. Our highly trained staffs ensure that the work is delivered on time to your satisfaction. We deal with an array of residential and commercial construction and architectural projects from major projects to minor, such as house renovation or other projects.

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