How Much Does a Garage Conversion Cost?

Converting a garage into a functional living space is a popular way to add extra room to your home without the expense of a full extension. Whether you’re transforming a single garage or a double garage into a new room, such as an ensuite bedroom or utility room, understanding the garage conversion cost is essential for planning a successful garage conversion.

This article examines the factors that influence costs, typical price ranges, and key considerations for your garage conversion project.

What is a Garage Conversion?

A garage conversion involves transforming an existing garage into a liveable space, such as a bedroom, home office, or utility room. By repurposing the existing structure, homeowners can create extra living space without building from scratch, often making it a cost-effective way to add space to the main house.

Benefits of Converting a Garage

Converting a garage offers multiple benefits, including increased property value and the creation of a habitable room tailored to your needs. It’s an excellent option for those needing extra space without moving. The process typically leverages the original structure, reducing construction costs compared to building a new extension.

Factors Affecting Garage Conversion Costs

Several variables influence the cost of a garage conversion, from the size of the garage to the complexity of the project. Below, we break down the key factors.

Size of the Garage

The size of the garage significantly impacts the cost. A single garage conversion typically costs less than a double garage due to the smaller footprint. For reference, a single garage is usually around 15–20 square meters, while a double garage can be 30–40 square meters.

Type of Conversion

The intended use of the new space affects costs. A basic conversion, such as a storage space or utility room, is less expensive than creating an ensuite bedroom or a fully equipped home office, which may require additional plumbing, electrics, or insulation.

Structural Changes

Modifying the existing structure, such as replacing the garage door with new windows or adding new doors, can increase costs. Structural changes, like reinforcing the garage roof or adjusting ceiling height, may require a structural engineer, adding to expenses.

Factors Affecting Garage Conversion Costs

Several variables influence the cost of a garage conversion, from the size of the garage to the complexity of the project. Below, we break down the key factors.

Size of the Garage

The size of the garage significantly impacts the cost. A single garage conversion typically costs less than a double garage due to the smaller footprint. For reference, a single garage is usually around 15–20 square meters, while a double garage can be 30–40 square meters.

Type of Conversion

The intended use of the new space affects costs. A basic conversion, such as a storage space or utility room, is less expensive than creating an ensuite bedroom or a fully equipped home office, which may require additional plumbing, electrics, or insulation.

Structural Changes

Modifying the existing structure, such as replacing the garage door with new windows or adding new doors, can increase costs. Structural changes, like reinforcing the garage roof or adjusting ceiling height, may require a structural engineer, adding to expenses.

Average Garage Conversion Costs

On average, a garage conversion in the UK costs between £10,000 and £30,000, depending on the complexity and location. Below, we outline typical costs for different types of conversions.

Single Garage Conversion Costs

A single garage conversion typically ranges from £10,000 to £20,000. This includes basic upgrades like insulation, new flooring, and installing electrics. Adding features like underfloor heating or new windows will push costs toward the higher end.

Double Garage Conversion Costs

Converting a double garage is pricier, with costs ranging from £20,000 to £30,000 or more. The larger space requires more materials and labour, especially if you’re creating multiple rooms or adding complex features like an ensuite.

Key Elements of a Garage Conversion

Several components contribute to the overall cost of a garage conversion project. Understanding these can help you budget effectively.

Garage Door Replacement

Replacing the garage door with a wall, window, or new doors is a common step. This typically costs £1,000–£3,000, depending on the materials and whether you choose to add windows for natural light.

Insulation and Damp Proofing

To create a habitable room, the converted garage must meet building regulations for insulation and damp proofing. Installing a damp proof membrane and roof insulation can cost £1,500–£4,000, depending on the garage size and insulation type, such as insulated plasterboard.

Flooring and Foundations

Garage floors often need upgrading to meet building regulations for habitable spaces. Adding new flooring, such as floor slabs or underfloor heating, costs £1,000–£3,000. If the existing floor is uneven or below external ground level, additional work may be needed.

Electrics and Plumbing

Installing electrics for lighting and power points typically costs £1,000–£2,500. If you’re adding plumbing for a bathroom or utility room, expect to pay an additional £2,000–£5,000.

Windows and Doors

Adding new windows or doors to bring in natural light and create an access point to the main house can cost £1,500–£4,000, depending on the size and quality of the materials.

Planning Permission and Building Regulations

Navigating planning permission and building regulations is crucial for a successful garage conversion.

Do You Need Planning Permission?

In many cases, a garage conversion falls under permitted development rights, meaning you may not need planning permission if the work is internal and doesn’t alter the external appearance significantly. However, if your home is a listed building or in a conservation area, you’ll likely need to consult your local planning authority. Planning applications typically cost £200–£500.

Building Regulations Approval

All garage conversions must comply with building regulations, covering aspects like fire safety, insulation, and structural integrity. You’ll need to submit a building notice to your local authority’s building control team, which costs around £200–£600. Hiring a structural engineer to ensure compliance may add £500–£2,000.

DIY Garage Conversion vs. Professional Services

For those with DIY skills, a DIY garage conversion can save money, but it’s not without risks.

DIY Garage Conversion Costs

A DIY garage conversion might cost £5,000–£10,000, covering materials like timber battens, insulated plasterboard, and new flooring. However, you’ll still need professional input for tasks like installing electrics or ensuring building regulations approval.

Hiring Professionals

Hiring a design professional or contractor ensures a high-quality finish and compliance with regulations. Professional services typically account for 60–70% of the total garage conversion cost, with labour charges ranging from £100–£200 per day.

Additional Considerations for a Successful Conversion

To ensure your garage conversion project runs smoothly, consider the following factors.

Fire Safety and Escape Routes

Building regulations require adequate fire safety measures, including escape routes. This may involve adding new windows or doors, costing £1,000–£3,000, to ensure safe evacuation in emergencies.

Ceiling Height and Structural Integrity

Most garages have sufficient ceiling height for a habitable room, but some may require raising the garage roof, which can cost £2,000–£5,000. A structural engineer can assess whether the existing structure needs reinforcement.

Connecting to the Main House

Creating an access point to the main house, such as through a wall separating the garage, enhances usability. This can cost £1,000–£2,500, depending on whether you’re adding a door or knocking through a wall.

Detached Garage Conversions

Converting a detached garage is often more expensive due to additional work, such as connecting utilities to the main house. Expect costs to be 10–20% higher than for an attached garage.

Common Uses for a Converted Garage

The versatility of a garage conversion makes it suitable for various purposes, each with different cost implications.

Ensuite Bedroom

An ensuite bedroom requires plumbing, insulation, and high-quality finishes, costing £15,000–£25,000. This is ideal for growing families or creating guest accommodation.

Home Office or Studio

A home office or studio is a simpler conversion, costing £10,000–£15,000. It typically involves insulation, electrics, and new flooring, with minimal structural changes.

Utility Room or Storage Space

A utility room or storage space is one of the most affordable options, costing £8,000–£12,000. These partial conversions require less finishing work, focusing on functionality.

Tips for Reducing Garage Conversion Costs

To keep costs down, consider the following strategies:

• Stick to Permitted Development: Avoid external changes that require planning permission to save on fees.

• Use Existing Features: Retain the original structure where possible to minimise structural work.

• DIY Where Safe: Handle simple tasks like painting or bare stud walls if you have the skills.

• Compare Quotes: Get multiple quotes from contractors to ensure competitive pricing.

Conclusion

A garage conversion is a cost-effective way to add extra living space to your existing home. Costs typically range from £10,000 to £30,000, depending on factors like the size of the garage, the type of conversion, and whether you need planning permission or building regulations approval.

By understanding the key elements—such as insulation, flooring, and structural changes—you can plan a successful garage conversion that meets your needs and budget. Always consult your local council or a design professional to ensure compliance and a high-quality finish for your new space.

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