A Guide to Building a Home Extension
Do you want to build a home extension but don’t know how to start? This guide is for you. The cost of building a home extension depends on the size of the extension and your specific needs. Additionally, there are several aspects involved in constructing home extensions that you should be aware of.
How Much Does Building an Extension Cost?
The financial requirements for building a home extension largely depend on various factors, such as your location, the size of the extension, the number of storeys, and your design preferences.
For a typical home extension, you should budget approximately £1,000 to £2,000 per square metre. If you’re considering a single-storey extension, the costs will generally be as follows:
- Basic quality: £1,000 to £1,680
- Good quality: £1,680 to £1,920
- Excellent quality: £1,920 to £2,160
While a two-storey extension may not be significantly more expensive, it will require more extensive work.
How to Build a Cost-Effective Home Extension
To create a cost-effective home extension, ensure that the design and shape are simple, as these are often cheaper than more complex designs. Additionally, choose an affordable construction method and building materials.
How to Build a Home Extension Without Planning Permission
You can build a home extension without planning permission if it falls under Permitted Development (PD), meaning you won’t need to undergo the application process. However, if your home is in a National Park or a Conservation Area, the scope of work under Permitted Development may be limited. Under PD rights, specific works can be done without planning permission if you meet certain criteria, such as:
- You can extend your detached home by up to 8m at the rear for a single-storey extension.
- A single-storey extension must not exceed 4m in height at the ridge and eaves, and the ridge height cannot be greater than that of the existing home.
- Two-storey extensions must be at least 7m from the rear boundary.
- Side extensions can only be a single storey, with a maximum height of 4m and a width of no more than half of the original extension.
- All new extensions must be built using similar materials and methods as the existing structure.
Do You Need a Lawful Development Certificate to Extend Your Home?
Even if your project can be carried out under PD rights, you must apply for a Lawful Development Certificate (LDC) from your local authority to confirm the extension’s legality and compliance with PD requirements. This is particularly necessary if you plan to sell the home later. An LDC typically costs £103, which is half the price of a planning permission application fee.
What to Consider Before Building a Home Extension
There are several factors to consider before embarking on a home extension:
The Design
If you have a great design idea but don’t know how to sketch it, consider hiring a building and design company or collaborating with an architect. If you’re experienced with CAD, you can create your designs, but for complex ideas, it’s best to consult a professional.
Site Access
Ensure that deliveries can be made easily to your home during the construction. Plan for how trucks and lorries will access the property and deliver large items. You will also need to decide where workers will park and store their tools.
What Building Regulations Do You Need to Follow?
Regardless of whether your extension requires planning permission, you must comply with all Building Regulations. You can either submit a Full Plan Submission or a Building Notice to adhere to these regulations.
Full Plan Submission
Submit a full plan to your local authority building control or a licensed inspector before starting your extension. A local building inspector will visit at various stages to monitor the progress.
Building Notice
This notice informs the local building authority of your intention to comply with regulations while constructing your extension and provides a 48-hour warning before work begins. Inspectors will review the work at different stages and inform you of any issues.
About Muse
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At Muse Architects, we offer a wide range of local architectural services to clients in Manchester and beyond. From building control in Manchester to office design project management, our team of experienced architects has the skills and expertise to handle any project. Whether you’re looking for commercial building architects or residential architects near you, we’re here to help.
As local architects, we understand the unique challenges and opportunities of designing buildings in Manchester. We specialise in Manchester residential architect services and work closely with clients to create beautiful, functional spaces. Our 3D property visualisation services, including 3D visualisation for city planning and interior design, are designed to help you bring your vision to life. Contact us today to learn more about how Muse Architects can help you achieve your architectural goals.
