House Extension Barnet | Professional House Extensions in Barnet

Fixiz Ltd delivers professional house extension services across the London Borough of Barnet. Whether you need a single-storey rear extension, a double-storey side extension, or a wrap-around extension, our experienced team will design and build the perfect addition to your home in High Barnet, Finchley, Hendon, Edgware, Mill Hill, or any surrounding area.

Why Choose a House Extension in Barnet?

Barnet is one of London’s largest boroughs with a wide variety of residential properties from Victorian terraces to spacious 1930s semis. With moving costs and stamp duty making relocation expensive, a house extension in Barnet is a cost-effective way to create the extra space your family needs. A well-designed extension can add significant value to your property while transforming your daily living experience. According to GOV.UK planning guidance, many extensions can be completed under permitted development rights.

Types of House Extensions We Build in Barnet

Single-Storey Rear Extensions

The most popular type of house extension in Barnet. A rear extension can create a spacious open-plan kitchen-diner, a larger living area, or a dedicated family room. Many single-storey rear extensions up to 6 metres for semi-detached or 8 metres for detached properties can be built under permitted development.

Double-Storey Extensions

Double-storey extensions provide additional space on both floors, typically adding a kitchen-diner below and an extra bedroom or bathroom above. This maximises the value added to your property and is ideal for growing families in areas like Finchley and Hendon.

Side Return Extensions

Side return extensions make use of the narrow alley that runs alongside many terraced and semi-detached properties. By incorporating this unused space, you can significantly widen your kitchen or living area without losing garden space.

Wrap-Around Extensions

A wrap-around extension combines a side and rear extension into one, creating the maximum amount of additional ground floor space. This is an excellent choice for homeowners wanting a large open-plan kitchen, dining, and living area.

House Extension Barnet – Planning Permission

Many house extensions in Barnet can be built under permitted development rights without requiring planning permission. However, the size, height, and position of the extension must comply with specific rules. Properties in conservation areas or those with Article 4 directions may face additional restrictions. Our team will assess your property and advise on all planning requirements from the start.

All extensions must comply with building regulations covering foundations, structural integrity, damp proofing, drainage, insulation, and fire safety. Fixiz Ltd manages the complete building control process on your behalf.

House Extension Costs in Barnet

House extension Barnet costs vary depending on the type, size, and specification:

• Single-storey rear extension: from £35,000
• Side return extension: from £25,000
• Double-storey extension: from £55,000
• Wrap-around extension: from £45,000

We provide fully detailed quotations after a free site survey with no hidden costs or surprises.

Our House Extension Barnet Process

1. Free site survey and consultation
2. Architectural design and drawings
3. Structural engineering calculations
4. Planning and building control applications
5. Party wall notices where required
6. Construction and project management
7. Final inspection and completion certificate

Why Choose Fixiz Ltd?

• Over 10 years of experience building extensions across North London
• Fully insured and CITB certified
• Full project management from design to completion
• Building regulations compliant with full sign-off
• Transparent pricing with no hidden fees
• Free site survey and detailed quotation

Get a Free Quote

Contact Fixiz Ltd today for a free house extension consultation in Barnet. We serve High Barnet, Finchley, Hendon, Edgware, Mill Hill, Whetstone, Totteridge, and all surrounding areas. You can also explore our house extension services for more details on what we offer across London.