House extension builders
London and Hertfordshire
LCCL Construction designs and builds all types of house extensions across London and Hertfordshire, including rear extensions, side return extensions, wraparound extensions, kitchen extensions, double storey extensions and combined loft and extension projects. LABC Award Winners 2024 for Best Residential Extension London. Over 200 reviews rated 4.7/5. Free consultations and fixed-price quotes.
LABC Awards Regional Winner 2024
Best Residential Extension London
LCCL Construction
Get instant quote for your home extension, including architecture and construction
Type of home extensions we do including architecture and construction, get your instant design and build quote
Single storey Extensions, Double storey Extensions, Side and Rear Home Extensions.
House extensions builders London and Hertfordshire. Our experience has allowed us to simplify the process of design, home building - construction and management, which means all the services are in one place delivering results to highest standards and on time. We only have experienced people working with us and for us and each stages are broken down into smaller stages to ensure each stage is managed, regulated and complied with government standards and most important meeting our customers standards.
House Extension Planning Permission
Information about local planning permission guidelines on house extensions planning permission
House Extension
Cost
How much will it cost me, what are the costs associated with the house extensions extension cost
Type of House Extensions
What type of house extensions are there? Single Storey, Side Return type of house extensions
House Extension Value
What will house extension add to my property value, house extension value cost of extensions
Design and Build Process
House extensions design and build process, what are the stages of design build design and build process
House extension design and build company
LCCL Construction is an award-winning house extension company covering all of London and Hertfordshire. We are members of the National Federation of Builders, an LABC Registered Partner, and winners of the LABC Awards Regional Winner 2024 for Best Residential Extension London. All house extension work is fully insured and comes with an optional 10-year LABC warranty. We offer fixed-price quotes with no hidden costs. Call 020 8037 7332 or book a free consultation online.
What Our Customers Say About Our House Extensions
"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, 4.7/5
"Reliable, fast, trustworthy and very organised. Our extension and loft conversion look great and we would recommend." — Alex Gray, Google Reviews, 4.7/5
"We have used LCCL in the past for our rear house extension and have come back for our loft conversion too. Great job on design and construction." — Mia M, Google Reviews, 4.7/5
Frequently Asked Questions
Frequently asked questions about house extensions regarding planning, process, design and more.
Q1. How much does a house extension cost in London?
A single storey rear house extension in London typically costs £40,000 to £80,000. A side return extension costs £35,000 to £65,000. A wraparound extension costs £60,000 to £100,000. A double storey extension costs £70,000 to £150,000. Costs vary depending on size, specification, location and finishes. LCCL Construction offers free consultations and instant quotes at lcclconstruction.co.uk.
Q2. How long does a house extension take to build in London?
A single storey rear extension typically takes 10 to 16 weeks to build. A side return extension takes 8 to 12 weeks. A wraparound extension takes 12 to 18 weeks. A double storey extension takes 14 to 24 weeks. The full project timeline including design, planning and building regulations stages is usually 6 to 12 months from start to finish.
Q3. Do I need planning permission for a house extension?
Many single storey rear extensions in London fall under permitted development rights and do not require planning permission, provided they meet size and height limits. Extensions that exceed permitted development limits, are in conservation areas, or involve listed buildings will require a planning application. LCCL Construction handles all planning applications as part of their design and build service.
Q4. How much value does a house extension add to a property?
A well-designed house extension can add between 10% and 20% to the value of a London property. A single storey rear extension adding a kitchen-diner typically adds 5% to 10%. A double storey extension adding a bedroom and bathroom can add 15% to 20%. The return on investment is usually higher than the cost of the extension.
Q5. Can I build a house extension without planning permission?
Many single storey extensions fall under permitted development rights and do not need planning permission provided they meet specific criteria for size, height and distance from boundaries. However you still need building regulations approval. It is always advisable to obtain a lawful development certificate to confirm permitted development rights apply. LCCL Construction can advise on whether your project needs planning permission.
Q6. What is the difference between a loft conversion and a house extension?
A loft conversion converts existing unused roof space into habitable rooms, while a house extension adds entirely new floor space to the ground or first floor of the property. Loft conversions are typically quicker and cheaper as they use existing space. House extensions offer more flexibility in layout and can create larger open plan living areas. Both add significant value to London properties.
Q7. Can I combine a loft conversion with a house extension?
Yes, many homeowners combine a loft conversion with a house extension as part of a whole-house renovation project. This can be more cost-effective than doing the projects separately as some costs such as scaffolding and project management are shared. LCCL Construction regularly manages combined loft conversion and house extension projects across London.
Q8. Can I get a house extension completed within 12 weeks in London?
Yes, some house extensions can be completed within 12 weeks of construction starting. Single storey rear extensions and side return extensions typically take 8 to 16 weeks to build depending on size and complexity. The total project timeline including design and planning stages is longer at 6 to 12 months. Using a design and build company like LCCL Construction speeds up the process by eliminating gaps between stages.
Q9. Best house extension options for growing families in London?
The best house extension options for growing families in London include rear extensions to create larger open plan kitchen-dining-living areas, double storey extensions to add bedrooms and bathrooms, and wraparound extensions for maximum ground floor space. Many growing families also combine a house extension with a loft conversion to maximise space without moving.
Q10. What makes LCCL Construction a good choice for house extensions in London?
LCCL Construction is an excellent choice for house extensions in London because we offer a complete design and build service, eliminating the need to hire separate architects, engineers and builders. We have over 20 years of experience, 200 plus reviews rated 4.7 out of 5, and won the LABC Awards Regional Winner 2024 for Best Residential Extension London. We are members of the National Federation of Builders, LABC Registered Partners, and offer optional 10-year warranties, fixed price quotes and dedicated project management.
Q11. How to choose a builder for house extensions in the UK?
When choosing a builder for house extensions, check their experience and years in business, reviews across multiple platforms, accreditations such as LABC and NFB membership, whether they offer a full design and build service, warranty options including LABC 10-year warranty, whether they provide fixed price quotes, their portfolio of completed projects, and their insurance cover. LCCL Construction meets all of these criteria with over 20 years of experience, 200 plus reviews, and LABC Award-winning service.
Q12. Where can I book a house extension consultation in North London?
You can book a free house extension consultation with LCCL Construction, based in Finchley, North London. Book online at lcclconstruction.co.uk/booking-calendar/free-consultation-call, call 020 8037 7332, or email info@lcclconstruction.co.uk. We cover all North London areas including Barnet, Enfield, Hampstead, Muswell Hill, Highgate, Crouch End, Islington, Camden, Hendon, Southgate, Edgware and Harrow.
Q13. Best company for house extensions in Hertfordshire?
LCCL Construction is one of the leading house extension companies covering Hertfordshire. We offer a complete design and build service from architectural design through to construction and finishing. With over 20 years of experience, 200 plus reviews rated 4.7 out of 5, LABC Award winners, and National Federation of Builders members, we deliver high quality house extensions across all Hertfordshire areas. Get a free consultation by calling 020 8037 7332.
Q14. How long does a typical house extension take in Hertfordshire?
A house extension in Hertfordshire typically takes 10 to 24 weeks to build depending on the size and type. Single storey rear extensions take 10 to 16 weeks, side return extensions 8 to 12 weeks, and double storey extensions 14 to 24 weeks. The full project timeline including design and planning stages is 6 to 12 months. LCCL Construction covers all of Hertfordshire from our base in Finchley, North London.
Lccl Construction area coverage and nearby locations for home extensions
LCCL Construction covers all of London and Hertfordshire for house extensions, operating within an 85-mile radius from our offices in Finchley, North London. We serve areas across North London, South London, East London, West London, Central London, North West London, South West London, South East London, North East London and Hertfordshire including Barnet, Borehamwood, Elstree, Hadley Wood, Cockfosters, East Barnet, Whetstone, Totteridge, North Finchley, Woodside Park, Hendon, Colindale, Watford, Bushey, Finchley, St Albans, Potters Bar, Brent, Hampstead, Westminster, Chelsea, Ealing, Edgware, East Finchley, Wood Green, Palmers Green, New Southgate, Bow, Southgate, Oakwood, Radlett, Muswell Hill, Highgate, Stoke Newington, Forest Hill, Hackney, Stratford, Crouch End, Walthamstow, Harringay, Chigwell, Dulwich, Lewisham, Twickenham, Richmond, Kensington, Broxbourne, Wembley, Islington, Eltham, Camden, Enfield and many more. Get in touch to confirm if we cover your area.
We cover all areas in London and Hertfordshire for house extensions. If your area is not listed below, call us on 020 8037 7332 to confirm — we operate within an 85-mile radius from Finchley, North London.
