Wrap Around Extension Builders in Harrow
We design and build wrap around extensions for homeowners in Harrow who want to significantly increase ground-floor space. By combining side and rear extensions, wrap around layouts create large, practical living areas that transform how the home is used.
Trusted locally for complex wrap around extensions planned and built with full structural control.
Service Overview
A wrap around extension extends both to the side and rear of a property, forming an L-shaped layout. This type of extension delivers the largest increase in ground-floor space and allows for full internal reconfiguration.
Wrap around extensions are suitable for:
Semi-detached houses – the most common and effective option
End-of-terrace properties – where side access is available
Detached homes – allowing for wider, more flexible designs
Common uses for side extensions include:
Large open-plan kitchen, dining, and living areas
Kitchen extensions with island layouts and roof glazing
Family spaces with direct garden access
Utility rooms, storage, and ground-floor WCs
Wrap around extensions are often chosen when a rear or side extension alone would not provide enough space.
Our Wrap Around Extension Process
Site Visit & Feasibility
We assess boundaries, access, drainage, and existing structure to confirm how the side and rear elements can be combined safely and efficiently.
Design coordination & approvals
We review drawings, structural calculations, and planning requirements to ensure the extension is compliant before construction begins.
Construction & inspections
The build is phased to maintain stability of the existing house, with inspections at foundations, drainage, steel installation, and insulation stages.
Completion & sign-off
Final works are completed, building control approval is secured, and the extension is handed over ready for occupation.
Planning Permission & Building Regulations
Wrap around extensions almost always require planning permission, as they combine side and rear development and have a greater visual and spatial impact.
Planning considerations typically include:
Overall footprint and boundary distances
Height and roof design
Impact on neighbouring properties
Loss of light and outlook
All wrap around extensions must meet Building Regulations, including:
Structural integrity and steelwork
Fire safety and escape routes
Drainage and damp protection
Thermal performance and ventilation
We coordinate inspections and approvals throughout the build.
Local & Trusted Builders
Serving Harrow & surrounding areas
Proven experience delivering wrap around extensions in Harrow
Strong understanding of structural sequencing and load paths
Expertise in complex steel installations
Careful boundary and neighbour management
Fully insured and building control compliant
Trusted by Homeowners in Harrow
5★ rated on Google by local customers
"LA Construct did a great loft conversion for my family home. Professional from the start, would highly recommend."
- Adrian D, Harrow
"I couldn’t be happier with the work done by LA construct on my bathroom fit-out. From start to finish, the entire process was smooth, professional, and hassle-free. The team was punctual, tidy, and their attention to detail was second to none."
- Darren S, Pinner
"Overall it was top quality with a positive experience and wouldn’t hesitate a minute to recommend Ari!"
- Chandra M, Pinner
Why Choose Us for Your Warp Around Extension
Trusted Builders in Harrow
Complex extension expertise
We specialise in extensions involving multiple structural alterations.
Phased construction approach
Side and rear elements are built methodically to protect the existing house.
Local knowledge
Experience working within Harrow’s planning and inspection processes.
Clear communication
You deal directly with the build team, with regular progress updates and site access.
Our Projects
We take pride in delivering high-quality building projects across Harrow and surrounding areas.
Recent extension projects in Harrow
How Much Does a Wrap Around Extension Cost ?
Wrap around extensions in Harrow typically range from £2,300 – £3,400 per m², reflecting their size and structural complexity.
Cost is affected by:
Total floor area added
Structural steel requirements
Drainage rerouting and foundations
Roofing design and glazing
Level of internal finishes
All costs are assessed individually following a site visit.
NEED MORE INFORMATION?
Frequently Asked Questions
Answers to some of the most common questions we’re asked about wrap around extensions.
Do you help with planning permission and drawings?
Yes. We can guide you through the planning process and work alongside architects, structural engineers, and building control where required. If planning permission isn’t needed, we’ll still ensure the extension complies fully with building regulations.
Are you fully insured and building regulations compliant?
Yes. We are fully insured, and all work is carried out in line with current building regulations. Required inspections are arranged and completed at the correct stages of the build.
Will I need to move out while the extension is built?
In most cases, no. Many clients stay in their homes while the extension is being built. We plan the work carefully to minimise disruption and keep the site safe, tidy, and organised.
Do you provide a written quote and clear stages?
Yes. After a site visit, we provide a clear, detailed quote outlining what’s included. We explain each stage of the build so you know exactly what to expect — no surprises
Do wrap around extensions need planning permission?
Yes. Wrap around extensions generally require full planning permission due to their scale and impact.
How long does a wrap around extension take?
Most wrap around extensions take 14–20 weeks, depending on size, access, and inspections.
How do I get started?
Simply contact us to arrange a free site visit. We’ll discuss your ideas, assess your property, and give honest advice on the best way forward.
Get a Free Wrap Around Extension Quote
Leave your details and we’ll get back to you to arrange a free site visit.
A successful HMO conversion is built around compliance, safety, and long-term usability.
Our Service Areas
We deliver wrap around extensions across Harrow and surrounding areas in North West London.
Call or WhatsApp for a free quote.
Harrow
Stanmore
Northwood
Edgware
Watford
Wembley
Pinner
Ruislip
Greenford
Northolt
LA Construct Ltd
Trusted builders serving Harrow & surrounding areas.
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