House Extension Services in Cockfosters

Professional House Extension Solutions for Cockfosters Residents

Free Site Visit

Fast Turnaround

Local Cockfosters Expertise

High Planning Approval Rate

Professional House Extensions in Cockfosters

Planning a house extension in Cockfosters? Our expert architectural team specializes in creating beautiful, functional extensions that enhance your home's value and living space. Located within the Enfield catchment area, Cockfosters offers excellent opportunities for residential development, and our local expertise ensures your project benefits from professional design solutions tailored to the area's unique characteristics.

House extension project near Cockfosters

A recent extension project in the Enfield area

Local Expertise

Having worked extensively in Cockfosters and the surrounding Enfield area, our architects possess deep understanding of local planning requirements, building regulations, and architectural styles. This local knowledge enables us to provide accurate advice, realistic timelines, and cost-effective solutions tailored specifically for Cockfosters projects. We stay current with evolving planning policies and building regulations, ensuring your project meets all current requirements.

Planning & Regulations

Understanding Cockfosters's planning policies and building regulations is crucial for successful project delivery. Our team has extensive experience working with Enfield Council and building control departments, ensuring your project meets all regulatory requirements. We stay current with changes to planning policy and building regulations affecting Cockfosters, including updates to permitted development rights, conservation area guidelines, and sustainability requirements.

Property Types We Work With in Cockfosters

Cockfosters has a diverse housing stock and we have experience extending all property types in the area. Our architects adapt designs to suit the character and structure of each home, whether that means matching original brickwork on a period property or creating a contemporary contrast on a more modern home.

Victorian terraces

Edwardian semis

post-war council houses

1930s semis

modern townhouses

period conversions

Free Quote for Cockfosters

Tell us about your project and get expert advice within 24 hours.

Get a Free Quote Call 020 3051 9430

Mon–Fri: 9am–5pm

Free site visit & consultation

No obligation quote

Covering EN4 & surrounding postcodes

House Extension Costs in Cockfosters (2026)

Guide prices for house extensions in the Enfield area. Every project is different — we provide a detailed, itemised quote after a free site visit.

Extension Type	Typical Cost	Build Time	Planning
Single Storey Rear Extension	£35k – £70k	3–4 months	Usually PD
Double Storey Extension	£55k – £120k	5–7 months	Full application
Side Return Extension	£25k – £50k	2–3 months	Usually PD
Wrap-Around Extension	£60k – £130k	4–6 months	Full application
Loft Conversion (Dormer)	£40k – £65k	6–8 weeks	Usually PD
Kitchen Extension	£30k – £60k	3–4 months	Usually PD
Basement Conversion	£80k – £200k	4–8 months	Full application
Garage Conversion	£15k – £30k	4–6 weeks	Usually PD

Prices are guide figures for 2026 based on projects in the Greater London area. PD = Permitted Development (no formal planning application needed in most cases). Actual costs depend on specification, site conditions, and scope.

Our Extension Services in Cockfosters

Single Storey Extensions

Professional single storey extension design and planning for ground floor expansions

Typical: 6-12 weeks

Double Storey Extensions

Two-storey home extension design maximizing space and value

Typical: 8-16 weeks

Rear Extensions

Garden-facing extensions creating seamless indoor-outdoor living

Typical: 6-10 weeks

Side Extensions

Narrow extensions utilizing side garden space efficiently

Typical: 6-12 weeks

Kitchen Extensions

Specialized kitchen and dining space extensions for modern living

Typical: 8-14 weeks

Loft Conversions

Converting attic space into valuable living areas

Typical: 6-10 weeks

Basement Extensions

Underground extensions creating additional living space

Typical: 12-20 weeks

Planning Permission Services

Expert guidance through planning applications and permitted development

Typical: 8-16 weeks

Wrap Around Extensions

Comprehensive extensions combining rear and side elements for maximum space

Typical: 10-18 weeks

House Refurbishments

Comprehensive whole-house renovation and modernization services

Typical: 12-24 weeks

Structural Alterations

Expert structural engineering services including underpinning and load-bearing work

Typical: 8-16 weeks

Garage Conversions

Converting garages into functional living spaces for bedrooms, offices, and studios

Typical: 4-8 weeks

How Your Cockfosters Extension Project Works

From the first phone call to moving into your new space — here is what to expect at every stage.

Step 1

Free Consultation

We visit your Cockfosters property, discuss your vision, assess feasibility, and give you honest guidance on costs and planning routes.

Step 2

Design & Drawings

Our architects create detailed plans, 3D visuals, and construction drawings tailored to your Cockfosters home and how you want to live in it.

Step 3

Planning & Approvals

We prepare and submit your planning application, liaise with the local authority covering Cockfosters, and handle building regulations documentation.

Step 4

Construction

Our vetted builders bring the design to life. We oversee the build, conduct regular site visits, and manage quality at every stage.

Step 5

Completion & Sign-Off

Final inspections, building control sign-off, snagging checks, and handover — your new Cockfosters space is ready to enjoy.

House Extension Services

For residential projects in Cockfosters, we offer comprehensive extension services including house extensions, loft conversions, garage conversions, and wrap-around extensions. Our designs maximize space and value while respecting the local built environment. We use the latest CAD software and 3D visualization techniques to help you visualize your project before construction begins.

Planning Permission

Our Cockfosters planning permission services include pre-application advice, full planning applications, and advice on permitted development rights. We work closely with Enfield Council to ensure your application meets all requirements and has the best chance of approval. Our goal is to secure planning permission efficiently while ensuring your project meets all regulatory requirements.

Completed house extension in Cockfosters area

Extension completed in the Enfield area

Building Control

For Cockfosters projects, we provide ongoing support throughout the construction process, including site inspections, compliance monitoring, and liaison with building control officers. Our drawings are produced to building control standards, ensuring clear communication of construction details and compliance requirements. Our goal is to ensure your project meets all building regulations while maintaining design quality.

Why Choose Us in Cockfosters

Our Cockfosters clients benefit from our extensive local knowledge, established relationships with planning authorities and contractors, and commitment to delivering exceptional results. We take pride in our ability to transform client visions into reality while respecting local character and meeting regulatory requirements. We offer competitive rates, transparent pricing, and flexible service packages tailored to your specific needs.

Helpful Guides for Your Cockfosters Extension

Loft Conversions in London: The Complete 2026 Guide to Costs, Planning & Design

Everything you need to know about loft conversions in London in 2026. Dormer, hip-to-gable, mansard and L-shaped options explained with costs, timelines and planning permission guidance.

Kitchen Extensions in London: Ideas, Costs & Planning Permission Guide 2026

Plan your dream kitchen extension in London. Explore side-return, rear and wrap-around options with 2026 costs, planning tips and design inspiration for every budget.

House Extension Costs London 2026: Area-by-Area Price Guide

Updated 2026 price guide for house extensions across London. Costs for single storey, double storey, loft conversions and more — broken down by area and project type.

Frequently Asked Questions About House Extensions in Cockfosters

How much does a house extension cost in Cockfosters?+

House extension costs in Cockfosters vary by type and size. Single storey rear extensions typically range from £35k – £70k, double storey extensions from £55k – £120k, and loft conversions from £40k – £65k. These are guide prices for 2026 — we provide an accurate, itemised quote after a free site visit to your Cockfosters property.

Do I need planning permission for a house extension in Cockfosters?+

Many extensions in Cockfosters can be built under permitted development rights without a formal planning application. This typically covers single storey rear extensions up to certain size limits. However, if your property is in a conservation area, is a listed building, or if the extension exceeds permitted development limits, a full planning application is needed. During our free consultation we assess your Cockfosters property and advise on the best route — and handle the entire application if needed.

What types of house extensions can you build in Cockfosters?+

We design and build all types of extensions in Cockfosters: single storey rear extensions, double storey extensions, side return extensions, wrap-around extensions, loft conversions (dormer, hip-to-gable, mansard), garage conversions, basement conversions, and kitchen extensions. Cockfosters has a mix of Victorian terraces, Edwardian semis, post-war council houses — we tailor every design to the specific property type.

How long does a house extension take in Cockfosters?+

Timelines vary by project: a single storey extension typically takes 3–4 months on site, a double storey 5–7 months, and a loft conversion 6–8 weeks. Before construction, the design and planning stage usually takes 8–12 weeks. We map out a detailed programme during your free consultation so you know exactly what to expect.

Do you handle planning applications with Cockfosters council?+

Yes — we have extensive experience submitting planning applications to the local authority covering Cockfosters. We prepare all drawings, design & access statements, and supporting documents, then manage communication with planning officers through to decision. Our knowledge of local policies helps avoid unnecessary delays or objections.

What areas near Cockfosters do you cover?+

We cover Cockfosters and all surrounding areas within a 20-mile radius. This means we can handle projects across the wider Enfield area, with the same level of local knowledge and expertise you'd get from a firm based in Cockfosters itself.

Ready to Start Your Cockfosters Extension?

Ready to start your house extension project in Cockfosters? Contact our expert team today for a free consultation and detailed project assessment. We offer competitive rates, professional service, and local expertise that ensures your project's success. Our Cockfosters extension services are designed to meet your specific needs, whether you're planning a rear extension, loft conversion, or complete home transformation.

Get a Free Quote Call 020 3051 9430