House Extension Islington | Professional House Extensions in Islington

Fixiz Ltd delivers professional house extension services across the London Borough of Islington. 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 Highbury, Canonbury, Holloway, Finsbury Park, or any surrounding area.

Why Choose a House Extension in Islington?

Islington is one of London’s most densely populated and sought-after inner boroughs, with a rich mix of Georgian and Victorian terraced properties. With property prices among the highest in London and limited space to move outward, a house extension in Islington is the most cost-effective way to create the extra space your family needs. A well-designed extension in Islington can add significant value to your property while transforming your daily living experience.

Types of House Extension Islington Homeowners Choose

Single-Storey Rear Extensions

The most popular type of house extension in Islington. 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 Highbury, Canonbury, and Barnsbury.

Side Return Extensions

Side return extensions make use of the narrow alley that runs alongside many terraced properties in Islington. 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.

Planning Permission for House Extension in Islington

Many extensions in Islington can be built under permitted development rights without requiring planning permission. However, Islington has numerous conservation areas — including Canonbury, Barnsbury, and parts of Highbury — where stricter planning controls apply. 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 Islington

Extension costs in Islington vary depending on the type, size, and specification:

• Single-storey rear extension: from £38,000
• Side return extension: from £28,000
• Double-storey extension: from £58,000
• Wrap-around extension: from £48,000

We provide fully detailed quotations after a free site survey with no hidden costs or surprises. For more details, see our pricing guide.

Our Extension 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 and East 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 Islington. We serve Highbury, Canonbury, Holloway, Finsbury Park, Barnsbury, Angel, Upper Street, and all surrounding areas. We also offer garage conversions and loft conversions across London.