How much does an extension cost?

Home Extension Cost Guide

Planning a home extension can be a complex task and may seem a little overwhelming at times. However, with the right help and guidance, the process can be made simple, enjoyable and stress-free.

Our guide will help you understand:

• The cost of an extension
• Additional costs to consider when planning
• The factors that can affect the cost of building an extension
• The different levels of extension projects and their typical costs per square metre

The figures below are intended to provide a ballpark guide to help you understand the potential costs involved in your project.

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Low-Cost Extensions

Low-cost extensions can typically range from £1,200–£1,600 per m².

Although low-cost extensions can be a suitable option for some homeowners, we typically do not undertake projects within this price range, as they do not align with our values and company culture.

We demand excellence in everything we do.

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Mid-Range Extensions

A mid-range extension can cost anywhere from £1,600–£2,200 per m².

Typically, a mid-range extension would be something such as a simple rear kitchen extension or side extension. When pricing a mid-range extension, TJD would usually work towards the mid-to-high end of this price range.

We operate towards this part of the price range because it allows us to deliver projects in a way that best accommodates our clients’ bespoke requirements. It also enables us to use high-quality labour and materials, ensuring that every project is delivered to the highest possible standard — something we take extremely seriously.

We also project manage our builds, ensuring that trades and materials are on site when required. This helps keep projects running smoothly and allows us to provide our clients with an accurate weekly update on progress.

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Premium-Range Extensions

Premium-range extensions can cost anywhere from £2,200–£4,000+ per m².

At this level, the design would typically be more bespoke, with higher-end materials specified throughout the project.

An example could be using natural stone instead of standard blockwork or brickwork, alongside other bespoke finishes and features.

TJD Joinery & Building Solutions excel at this type of project.

Our eye for detail and meticulous planning ensure that no stone is left unturned in our drive to achieve the best possible outcome. We relish the unique technical challenges that these projects can bring and work hard to find the best solutions for every individual project.

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Additional Costs When Planning an Extension

We have listed some of the main costs involved in planning and building an extension. There can be additional costs depending on the individual project, but these are some of the main areas to consider.

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Architectural Fees

An architect or architectural designer will work with you and your builder to bring your ideas to life. They will produce the initial designs and can also specify the materials and finishes to be used.

Good drawings are paramount to a successful building project. Detailed and accurate drawings can help identify and solve potential problems before they arise, helping to keep the project on time and within budget.

We have worked with many great architects and architectural designers over the years, so please feel free to ask us for recommendations.

The cost of architectural services will vary depending on the level of detail required and the architect or designer you choose for your project.

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Planning Permission

Planning permission may be required for your extension, although some projects may fall under permitted development rights and therefore may not require a full planning application.

Where planning permission is required, you will need to submit a planning application and pay the relevant application fees. Your architect or local planning authority will be able to advise you on the requirements and associated costs for your project.

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Building Control Fees

Building control fees are typically around £200–£600, depending on the size and complexity of your project and the building control provider you use.

When planning your extension, you can choose to use either a private building control company or your local authority’s building control service.

Although private building control can be slightly more expensive, we prefer to use private building control where appropriate, as we find them to be faster, more efficient and easier to deal with. This can be an important factor when working to tight timescales.

This is not to say that local authority building control services are unsuitable — it is simply our personal preference based on our experience.

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Factors That Can Affect the Cost of an Extension

There are many factors that can influence the final cost of an extension. Some of the main considerations include:

• Architectural specifications
• Trees and tree-related constraints
• Fixtures and fittings
• The size, shape and height of the proposed extension
• Site constraints and access
• Windows and doors, including bi-fold doors
• Rooflights
• Additional systems, such as underfloor heating
• Changes to the scope of works
• Demolition of existing structures, such as garages or conservatories
• Additional structural steelwork and knock-throughs
• Changes to the groundworks, such as deeper foundations being required
• Ground conditions
• Bespoke finishes and materials

Every extension is different, which is why it is important to consider all of these factors when establishing a realistic budget for your project.

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We’re Here to Help

We hope this guide has been helpful to anyone considering a home extension.

If you have any questions or would like to discuss your project or request a quotation, please feel free to contact TJD Joinery & Building Solutions Ltd via our website.

We would be happy to discuss your requirements and help you understand the options available for your project.

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TJD JOINERY & BUILDING SOLUTIONS LTD

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