Should I Add A Side Extension To My Property?

view from outside property with large beautiful side extension vaulted ceiling

A side extension can be a great way of creating extra rooms and larger open-plan floor space in your property. Side extensions are often a more practical option than a typical rear extension and can transform your home inside and out! Here we have created a quick step-by-step guide for things to consider on your journey to creating a side extension.

What is a side extension?

In its simplest definition – a side extension is an extension of an existing building from the left or right when facing the property. Side extensions are one of the most popular types of extensions, usually due to the fact they make excellent use of otherwise redundant space on your plot.

How to add a side extension?

When deciding that a side extension is how you want to transform your home, the planning and design stages are paramount to ensuring the build and final finish are flawless. It’s really useful to list (at the very beginning) all of the things you want to gain and that you require from your extension. This can be things like rooms to be added, areas to add additional space to an existing room, entrances, garden access, etc. You will also need to consider your budget, the feasibility of the extension and the likelihood of obtaining planning permission, and how the layout will work alongside your existing space.

Can I build my side extension under my existing permitted development?

Yes! It’s completely possible to build your side extension under your existing permitted development, however, the extension will need to adhere to certain size requirements for this to be the case for any eligible property. The extension usually has to be no more than half the depth of the original house, running up to the full width (front to back) of the house. If your property is a listed building or in a conservation area, it’s unlikely you will obtain planning permission and development rights. Check with your local planning team and council if you are unsure of your existing planning permission.

There are also additional rules with regard to proximity to the nearest boundary and even extensions that go beyond the rear house wall, therefore, we always recommend receiving advice before you part with any of your money.

How to apply for planning permission for a side extension

For anything larger than a small single-storey side extension, you will likely have to apply for planning permission.

Generally, it is advised that a professional – such as an architect or experienced draftsman – create and draw the project and undertake the application as your agent.

However, if you have some experience already, it is possible to draw your own plans and submit simple applications. If you are considering this take note of the following:

  • Drawings are required to be in a specific format, with boundary lines in red, a scale of 1:50 or 1:100 and clearly labelled showing existing and proposed works.
  • The application can be submitted via the planning portal.
  • Once you submit the application, make sure to check your emails as an officer will likely give you further information and wish to make a visit to the property/plot.

Do I need building regulations approval for my side extension?

Yes, you will require building regulations approval for creating a side extension, we highly recommend that this is carried out by a professional.

In our experience it is always best to:

  • Appoint an architect to draft your building regulations drawings.
  • Have a structural engineer conduct the structural design and calculations for your side extension.
  • Invite a building control officer to check all of this information.

Once these steps are completed, you should be ready to start building your side extension.

inside of property undergoing a side extension project

How do I find a builder for my side extension?

Finding a builder for your side extension is more of a case of confirming capable and reliable nominees. Builders can be found online, word of mouth recommendations, and even by seeing their logos around other building sites.

Whomever you choose to work with, make sure you do the following before hiring them:

  • Show your full plan documentation including a work schedule- this will remove any doubt regarding details and areas where miscommunication is possible.
  • Receive a quotation first and check the terms and conditions and work to be done thoroughly.
  • Make sure a completion date is agreed upon.

At Flawless Design and Build we can undertake all of your side extension requirements from planning to execution, please get in touch if you have any questions or would like a free quote. To speak to us visit the contact us page here

How much does a side extension cost?

Side extensions will be similar in cost to other such extension work. Generally work to include is:

  • A square meter cost from £1,800 to £2,500 per meter squared.
  • A lump construction cost of approx. £38,000 covers most conventional side extensions at 1 storey.
  • A lump sum of roughly £65,000 for the construction of a double-storey extension.
  • Professional fees of roughly 15% should cover you throughout the entire process.

**Prices fluctuate based on the standard of work and quality of materials used.

How long does it take to build a side extension?

A side extension typically takes about 8 to 10 months from the initial idea to completion. The steps are roughly as follows:

  • Architect to draw up design ready for planning submission: 1 month.
  • Planning decision time: 6 weeks.
  • Building regulations approval: 1 month.
  • Construction: 5 months

Please note this is a typical simple side extension. Any complexities during planning or construction can increase this time. We suggest always accounting for 1-2 months of extra time just in case of delays.

Any construction work needs to start with a good plan…

Now that you have the most important steps in position to create a side extension, you’re ready to go out and start your project. If you would like more information on side-extensions, need a free quotation, or simply would like some advice on your existing project, please contact our expert team today to see how we can help you achieve a Flawless Design and Build.