How to Perform a Successful House Extension?

If you perform a successful house extension in your home, you can transform your humble home into a big, valuable home. When high house prices and costs of moving are taken into consideration, improving your house instead of moving into a new one would be a good idea. In that way, you can maximise the potential of your home.

If you live in a London area, Studio 20 Architects is ready to help you in your house extension projects. You can contact us easily.

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Creating A Good Brief For House Extensions

If you want to perform any type of house extensions in your home, first, you should decide what you want to change in your property. You should avoid focusing too much on little details. Instead of that, you should decide if you want a bigger kitchen, bedroom or an extended ground floor to the right, next to the kitchen etc.

If you specify what you want for your home clearly, an architect can provide you with his/her professional advice. The type of extension you consider as the best option for your home may not be the best option for you. In a good house extension brief should include;



● Maximum budget when contingencies taken into account

● Allocated budget

Problems of existing house, such as

● Very small kitchen

● The garage is largely under utilised

● An en suite need of the main bedroom

● Needing an extra bedroom

● Needing a separate annexe

Family needs, such as

● Grandparents who live with family,

● Wife, husband two children under 10

● Regular visitors of all ages such as family members and friends

Essential requirements

● Need of a separate annexe

● More open space for recreation

Future proofing

● More efficacious boiler

● Needing more independent area for kids as they get older

Other important considerations

● Living in a conservation area

● Wish to live in contemporary light spaces

● Disliking beams

● Managing neighbours who shares a party wall with you

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Before deciding to extend your home, you should consider all poorly used space in your property. For instance, integrating old, poorly used cupboards, extensive landing spaces, dividing a big bedroom into two different rooms. You can also consider converting existing areas in your property such as a loft conversion, basement conversion, or garage conversion.

Taking this approach is generally cheaper than extending your property. Moreover, you won’t sacrifice your garden space. Consider house extension only if you take all options into account with your architect.


A great extension is the one that looks like an original part of your home. Performing this kind of extension is a difficult project because you need materials matching with the original materials of your home.

You can also choose to extend your home in a different style on purpose. For instance, you can use period styles and contemporary designs together If the extension is performed by a professional architecture firm like Studio 20 Architects, your extension would have a classy, chic design.

Building Extension


● Ineffective fragments of outside space, disconnected and cut off from the main garden

● Passive solar gain that brings favourable heat in the winter but disturbance in the summer Plants can be deprived of required sunlight because of poor designs.

● Deprivation of daylight and the feeling of space because of a poor conception of how light flows through your home and house extensions

● Deprivation of daylight and the feeling of space because of a poor conception of how light flows through your home and house extensions

● Undesirable light which affects usability of technology such as TV's and computer screens

● Designs that bravely reunite an entirely different style with great potential, but which creates a disjointed property.

● Some extensions could reduce the size of gardens which are already small

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Size, style and specifications are main factors that affect the cost of house extension. Many clients wish their architects to tell them how much they can get with their budget. However, it is very difficult to do that, especially if the plans of your house extensions are not clear yet.

If you are at this stage, you will need to settle for ballpark figures. The more specific your project gets, the more accurate estimations you can have.

In general, you can expect spending at least £1,850 per m2 upwards for a single-storey house extension project if standard bricks and blocks would be used.

It would be a surprising fact for you, but multi-storey extensions are generally cheaper per m2 than single-storey extensions. The main reason is that multi-storey extensions offer the same amount of internal space more or less. However, they reduce your outlay on the most expensive pieces of building projects i.e. foundations & roof structure.

If you want to include higher specifications such as glazed walls, prices for per m2 will naturally rise.