
Professional House Extension Solutions for Custom House Residents
Planning a house extension in Custom House? 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, Custom House 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.

A recent extension project in the Newham area
Having worked extensively in Custom House 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 Custom House projects. We stay current with evolving planning policies and building regulations, ensuring your project meets all current requirements.
Navigating planning requirements in Custom House requires local expertise and up-to-date knowledge of Enfield Council's policies. Our architects understand the specific requirements for extensions in the area and can guide you through the planning application process, ensuring your proposal has the best chance of approval. We provide advice on design considerations, sustainability requirements, and community consultation processes.
Custom House 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.
Tell us about your project and get expert advice within 24 hours.
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Covering E16 & surrounding postcodes
Guide prices for house extensions in the Newham area. Every project is different — we provide a detailed, itemised quote after a free site visit.
| Extension Type | Typical Cost |
|---|---|
| Single Storey Rear Extension | £35k – £70k |
| Double Storey Extension | £55k – £120k |
| Side Return Extension | £25k – £50k |
| Wrap-Around Extension | £60k – £130k |
| Loft Conversion (Dormer) | £40k – £65k |
| Kitchen Extension | £30k – £60k |
| Basement Conversion | £80k – £200k |
| Garage Conversion | £15k – £30k |
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.

Professional single storey extension design and planning for ground floor expansions
Typical: 6-12 weeks
Two-storey home extension design maximizing space and value
Typical: 8-16 weeks
Garden-facing extensions creating seamless indoor-outdoor living
Typical: 6-10 weeks
Narrow extensions utilizing side garden space efficiently
Typical: 6-12 weeks
Specialized kitchen and dining space extensions for modern living
Typical: 8-14 weeks
Converting attic space into valuable living areas
Typical: 6-10 weeks
Underground extensions creating additional living space
Typical: 12-20 weeks
Expert guidance through planning applications and permitted development
Typical: 8-16 weeks
Comprehensive extensions combining rear and side elements for maximum space
Typical: 10-18 weeks
Comprehensive whole-house renovation and modernization services
Typical: 12-24 weeks
Expert structural engineering services including underpinning and load-bearing work
Typical: 8-16 weeks
Converting garages into functional living spaces for bedrooms, offices, and studios
Typical: 4-8 weeksFrom the first phone call to moving into your new space — here is what to expect at every stage.
We visit your Custom House property, discuss your vision, assess feasibility, and give you honest guidance on costs and planning routes.
Our architects create detailed plans, 3D visuals, and construction drawings tailored to your Custom House home and how you want to live in it.
We prepare and submit your planning application, liaise with the local authority covering Custom House, and handle building regulations documentation.
Our vetted builders bring the design to life. We oversee the build, conduct regular site visits, and manage quality at every stage.
Final inspections, building control sign-off, snagging checks, and handover — your new Custom House space is ready to enjoy.
Specializing in residential extensions across Custom House, we provide tailored design solutions for every type of project. Our services include architectural design, planning applications, building regulations compliance, and construction drawings. We work closely with homeowners to create extensions that enhance their living space while maintaining the character and value of their property.
Planning permission applications in Custom House require careful preparation and local knowledge. Our team has successfully submitted numerous planning applications across the Enfield area, achieving high approval rates through thorough preparation and understanding of local planning policies. We handle all aspects of the planning process, from initial feasibility studies to final approval.

Extension completed in the Newham area
Our Custom House building control services include detailed construction drawings, structural calculations, fire safety assessments, and accessibility compliance reviews. We understand the specific building control requirements for extensions in the Enfield area and can advise on structural solutions, thermal performance standards, and sustainability requirements.
Our Custom House 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.

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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.

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.
Transform your Custom House home with our professional extension services. Contact us today for a free consultation and discover how we can help you create the perfect extension for your property. Our experienced team combines local knowledge with innovative design to deliver exceptional results that enhance your home's value and living space.
Discover our comprehensive range of house extension solutions in London and surrounding areas
Professional single storey extension design and planning for ground floor expansions
Two-storey home extension design maximizing space and value
Garden-facing extensions creating seamless indoor-outdoor living
Narrow extensions utilizing side garden space efficiently
Specialized kitchen and dining space extensions for modern living
Converting attic space into valuable living areas
Call now to speak with our expert team. Get instant responses and professional guidance for your extension project.