A guide to single-storey extensions
Single-storey extensions can transform your living space and add value to your property and lifestyle. If you are thinking of building a single-storey extension read our guide to find out how to get started.
Do I need an architect for an extension?
While there is no legal requirement for an architect to be involved with the building of an extension, it should be something you give serious consideration to before moving ahead with the project.
The importance of an architect cannot be understated when it comes to planning and ensuring the extension is built to a high standard. Not only can they advise on the layout for your intended use of the space, but also put together detailed architectural plans, prepare all the necessary documents and ensure it complies with current planning policies and Building Regulations.
A good architect will also be able to help you find a reliable contractor for the build and project manage the construction phase. This ensures it is built to a high standard and that budgets are not unnecessarily exceeded, all the while meeting delivery deadlines.
Find a local architect in Cambridge
Tereyn Architects can help you plan your single-storey extension from start to finish. Whether you are extending the kitchen, living room, bedroom or any other area of your home, we’ll guide you through every step of the process to transform the space into something special. Call us today on 07984 760920 or send us a message here and let us know all about your project.
Budget and costs
Extension costs can quickly spiral out of control if the budget is not well planned in advance. While you will start with a wish list, it’s likely you’ll have to narrow this down to fit in with your budget. Start by understanding what your costs per square metre of build is (typically this is around £1,250-£2,250 per m² depending on your location, project size, and build specification). With this you should add on your architects fees and other consultancy fees (such as engineers, building surveys, tree surveys etc). When planning your extension try to strike a balance between investing in good quality building materials and interior finishes without going overboard and that will ensure your spending remains manageable. Lastly, have a spreadsheet that assigns costs to each area. Do this by searching products online and getting quotations, then put theses costs beside each item on the list.
Do I need Planning Permission or Permitted Development?
Dealing with planning permission may seem like a big barrier to cross, but many single-storey extensions fall into the Permitted Development category and do not require you to make an application.
However, it is something that should always be checked before work begins and your architect should have a good idea of whether or not it will be needed.
Permitted Development grants automatic building rights to certain types of alterations and works without the need to apply for planning permission. House owners enjoy the biggest advantages, as it is usually flats and maisonettes that require planning permission for any significant changes or improvements being made, while rear extensions tend to be the most common type.
There are a number of guidelines that a single-storey extension has to adhere to in order to avoid planning permission. This includes things like:
A single-storey extension should not extend beyond 6m (semi or terraced) or 8m (detached) of the original house.
To avoid planning permission a single-storey extension should not be higher than 4m.
All side extensions must be single-storey with a height of no more than 4m. And, they must not be wider than half the width of the existing property.
However, although you will not need Planning Permission if your extension falls within the criteria above, it is still advisable in most cases that you submit a Prior Approval Notice. The architect will be able to provide more detailed guidance on these points and any other restrictions based on your specific plans.
What are Building Regulations?
No matter what kind of extension you are planning you will have to meet current Building Regulations. These are designed to ensure that the building is safe for people living or working in or close by to the structure. This covers every aspect of the build, including things such as fire protection, electrical and gas safety, energy performance, accessibility and more.
In order to comply with Building Regulations your architect must submit an application for work to your local authority or via a private approved inspector. The site will be visited by an inspector at various stages to ensure the regulations are being met. Self-certification may also be possible by some of the tradespeople or contractors working on the site, so the inspector will not have to check these elements of the project.
Get in touch with Tereyn Architects to book a free consultation about your single-storey extension. We can discuss your requirements in more detail, cover some of the statutory processes that will be needed and help you plan the next steps. Call us today on 07984 760920 or send us a message here and let us know all about your project.
