Ground Floor House Extension London and Hertfordshire
Expert ground floor extensions designed and built by LCCL Construction. Whether you need a rear extension, side return, wraparound or full-width ground floor scheme, we handle everything from architectural design to construction. Based in Finchley, London N3. LABC Award Winners 2024. Over 200 reviews rated 4.7 out of 5. Prices from £35,000.
LABC Awards
Winners 2024
200+ Reviews
4.7 / 5 Rating
NFB Members
LABC Partners
What Is a Ground Floor Extension?
A ground floor extension adds extra living space at ground level by extending the footprint of your property. It is an umbrella term that covers rear extensions, side return extensions, wraparound extensions and single-storey front extensions. Ground floor extensions are the most common type of house extension in London and Hertfordshire because they are the most practical and cost-effective way to add significant living space without moving.
Ground floor extensions are typically used to create larger kitchens, open-plan kitchen-diners, additional living rooms, home offices, utility rooms, downstairs bathrooms or ground floor bedrooms. The right type of ground floor extension for your property depends on the layout of your house, the available space around it and your priorities for how you want to use the new area.
LCCL Construction is an award-winning design and build company based in Finchley, London N3. We design and build ground floor extensions across London and Hertfordshire, from modest 3-metre rear extensions to full-width wraparound schemes. With over 20 years of experience, 200+ reviews rated 4.7/5, LABC Awards Regional Winners 2024 and NFB membership, we handle every stage from initial design to final building control sign-off.
Types of Ground Floor Extension
There are several types of ground floor extension, each suited to different property types and requirements:
Rear extension: Extends from the back of the house. The most common type. Works on terraced, semi-detached and detached properties. Typically 3 to 6 metres deep.
Side return extension: Infills the narrow alley (side return) along the side of the house. Very popular on Victorian and Edwardian terraced houses in London. Creates a wider kitchen or living space.
Wraparound extension: Combines a rear extension with a side return extension to create an L-shaped addition that maximises the ground floor footprint.
Side extension: Extends from the side of a semi-detached or detached house. Can add a significant amount of floor space on properties with wide plots.
Front extension: Extends the front of the property. Less common due to planning restrictions but can work on detached properties set back from the road.
LCCL Construction designs and builds all types of ground floor extension. Our architect will assess your property and recommend the best option to maximise your space and budget.
How Much Does a Ground Floor Extension Cost?
Ground floor extension costs in London range from £35,000 to £100,000 and higher depending on the type and size:
Side return extension: £35,000 to £55,000.
Rear extension (3 to 4 metres): £35,000 to £55,000.
Rear extension (5 to 6 metres): £55,000 to £80,000.
Wraparound extension: £60,000 to £100,000.
Note: Costs are dependable on final drawings, structural drawings, alterations and are subject to change.
All prices include full design and build — architectural design, structural calculations, building regulations, construction, electrics, plumbing, plastering and decoration. Kitchen units, specialist flooring and landscaping are typically additional.
Get an instant quote at lcclconstruction.co.uk or call 020 8037 7332.
Planning Permission and Building Regulations
Most single-storey ground floor extensions fall under permitted development rights. The key limits are 3 metres for terraced and semi-detached houses, 4 metres for detached, or up to 6 to 8 metres under the larger home extension scheme. Side extensions must not exceed half the width of the original house.
Planning permission is required for properties in conservation areas, listed buildings, and extensions that exceed permitted development limits. Building regulations approval is always required.
LCCL Construction manages all planning applications, lawful development certificates and building regulations submissions as part of our design and build service.
What Is Included?
Our design and build service covers everything: free consultation, measured building survey, architectural design, planning and building regulations, structural calculations, party wall agreements, all construction work, electrics, plumbing, plastering, decoration, building control sign-off and optional 10-year LABC warranty. One company, one point of contact, from start to finish.
How Long Does a Ground Floor Extension Take?
A ground floor extension typically takes 12 to 28 weeks to build. The full timeline from consultation to completion is usually 5 to 7 months:
Timelines may be longer for larger or more complex projects involving significant structural alterations.
Areas We Cover
We design and build ground floor extensions across London and Hertfordshire including Barnet, Finchley, Hendon, Muswell Hill, Highgate, Hampstead, Southgate, Enfield, Edgware, Borehamwood, St Albans, Potters Bar, Bushey, Watford, Ealing, Clapham, Putney, Wandsworth, Hackney, Islington, Camden and surrounding areas. Call 020 8037 7332 to get started.
What Our Customers Say
"In just over 6 months LCCL managed to transform my 1900s mid-terrace house into a clean and modern living space with a full rear extension, loft conversion and complete renovation. Super professional and on the ball at all times." — Matt EL, Houzz, 5/5
"We have used LCCL in the past for our rear house extension and have come back for our loft conversion too. Great job on both the design and construction." — Mia M, Google Reviews, 5/5
Frequently Asked Questions
How much does a ground floor extension cost in London?
Ground floor extension costs in London range from £35,000 to £100,000 depending on the type. Side return extensions start from £35,000, rear extensions from £35,000, and wraparound extensions from £60,000. All prices include full design and build.
What type of ground floor extension is best for a terraced house?
For terraced houses, a rear extension or side return extension are the most popular options. If your property has a side return passage, a wraparound extension combining both gives you the maximum ground floor space. LCCL Construction will assess your property and recommend the best option.
Do I need planning permission for a ground floor extension?
Most single-storey ground floor extensions fall under permitted development rights and do not need planning permission. The limits are 3 metres for terraced and semi-detached houses, 4 metres for detached, or up to 6 to 8 metres under the larger home extension scheme. Building regulations approval is always required.
How long does a ground floor extension take to build?
A ground floor extension typically takes 10 to 18 weeks to build depending on the type and size. The full project timeline including design and approvals is usually 4 to 7 months from initial consultation to completion.
Can I live in my house during a ground floor extension?
Yes. Most ground floor extensions are built from the outside and the opening into your existing house is one of the last stages. There will be some disruption but you do not usually need to move out.
How do I get started?
Call us on 020 8037 7332, book a free consultation at lcclconstruction.co.uk, or get an instant quote online. We provide free no-obligation consultations for all ground floor extension projects across London and Hertfordshire.