Loft conversion company London
London and Hertfordshire
LCCL Construction designs and builds all types of loft conversions across London and Hertfordshire, including dormer, hip-to-gable, mansard, L-shaped and velux loft conversions. Prices start from £18,000 for design and build. LABC Award Winners 2024 for Best Residential Extension London. Over 200 reviews rated 4.7/5. Free consultations and fixed-price quotes from our base in Finchley, North London.
LABC Awards Regional Winner 2024
Best Residential Extension London
LCCL Construction
Get instant quote for your loft conversion, including architecture and construction
Type of loft conversions we do including architecture and construction, get your instant design and build quote
Lccl Construction — Loft Conversion Company London and Hertfordshire
LCCL Construction is an award-winning loft conversion company based in Finchley, London N3, delivering full design and build loft conversions across London and Hertfordshire. With over 20 years of experience in residential construction and more than 200 verified reviews rated 4.7 out of 5, we are one of the most trusted loft conversion companies in North London.
We are LABC Awards Regional Winners 2024 for Best Residential Extension in London, members of the National Federation of Builders, LABC Registered Partners and Best of Houzz Services winners. These accreditations mean every project we deliver meets the highest standards of quality, safety and building regulations compliance.
Our design and build service covers every stage of your loft conversion under one roof. This includes the initial consultation and measured building survey, architectural design and drawings, planning permission applications where required, building regulations submissions, structural engineer calculations, party wall agreements, all construction work, electrics, plumbing, plastering, decoration and final building control sign-off. We offer optional 10-year LABC warranties on all loft conversion projects for complete peace of mind.
We design and build all types of loft conversions including dormer loft conversions, hip to gable loft conversions, L-shaped loft conversions, mansard loft conversions and velux loft conversions. Whether you need an extra bedroom, a home office, a playroom or a master suite with en-suite bathroom, our experienced team will design and build a loft conversion that maximises your space, adds value to your property and transforms how you live.
Our loft conversion services cover all London boroughs and Hertfordshire, with particular expertise in Barnet, Finchley, Hendon, Muswell Hill, Highgate, Hampstead, Southgate, Enfield, Edgware, Borehamwood, St Albans, Potters Bar, Bushey, Watford and surrounding areas. Book a free consultation or get an instant quote at lcclconstruction.co.uk.
What Our Customers Say About Our Loft Conversions
"LCCL Construction was the right company to help with my loft conversion. I heard of other people’s challenging experiences with building works so I was very careful which company I chose. LCCL Construction was professional, trustworthy and worked to the highest standard." — KashImaging, Trustpilot, 4.7/5
"We have used LCCL in the past for our rear house extension and have come back to instruct LCCL for our loft conversion too to our house in North London. LCCL has done a great job on design and construction." — Mia M, Google Reviews, 4.7/5
"Super professional and on the ball at all times. All his teams, from bricklayers, carpentry to electrics, roofing, tiling, painting, flooring and plumbing are excellent and hard working. They are conscientious and want the job to be well done." — Ludovic, Reviews.io, 4.7/5
Frequently Asked Questions
Q1. How much does a loft conversion cost in London?
A loft conversion in London typically costs between £18,000 and £75,000 depending on the type. Velux conversions start from £18,000, dormer conversions from £30,000, hip to gable from £35,000, L-shaped from £40,000, and mansard conversions from £45,000. Costs include architectural design, structural calculations, building regulations and construction. LCCL Construction offers free consultations and instant quotes at lcclconstruction.co.uk.
Q2. Do I need planning permission for a loft conversion in London?
Most loft conversions in London fall under permitted development rights and do not require planning permission. Exceptions include mansard conversions, properties in conservation areas, listed buildings, flats, and loft conversions that exceed 40 cubic metres on terraced houses or 50 cubic metres on detached and semi-detached houses. Building regulations approval is always required regardless of planning permission. LCCL Construction handles all planning applications as part of their design and build service.
Q3. How long does a loft conversion take to build?
A typical loft conversion takes 8 to 12 weeks to build depending on the type and complexity. The full design and build process including architectural drawings, planning applications and building regulations approval usually takes an additional 6 to 10 weeks before construction starts. The total timeline from initial consultation to completion is typically 4 to 6 months.
Q4. How much value does a loft conversion add to a London property?
A well-designed loft conversion can add between 15% and 25% to the value of a London property. For an average London home valued at £500,000, that could mean an increase of £75,000 to £125,000. Adding an extra bedroom with an en-suite bathroom typically delivers the highest return on investment. The cost of a loft conversion is almost always less than the value it adds.
Q5. What type of loft conversion is best for a semi-detached house?
The best loft conversion for a semi-detached house is typically a hip to gable conversion combined with a rear dormer. This maximises space by extending the sloped hip roof into a vertical gable wall while adding headroom at the rear. This combination typically costs £40,000 to £60,000 and can create a spacious master bedroom with en-suite. LCCL Construction specialises in hip to gable loft conversions across London and Hertfordshire.
Q6. What is included in a loft conversion?
A full design and build loft conversion from LCCL Construction includes initial consultation, measured building survey, architectural design drawings, planning permission application if required, building regulations drawings, structural calculations, party wall agreements if needed, all construction work, electrics, plumbing, plastering, decoration and final building control sign-off. An optional 10-year LABC warranty is also available.
Q7. Do I need building regulations approval for a loft conversion?
Yes, building regulations approval is always required for a loft conversion regardless of whether planning permission is needed. Building regulations cover structural integrity, fire safety, insulation, ventilation, staircase design and sound proofing. LCCL Construction handles all building regulations applications and LABC inspections as part of their design and build service.
Q8. Will I need to move out during a loft conversion?
No, you do not usually need to move out during a loft conversion. Most of the work is carried out from scaffolding outside and within the loft space itself. There will be some disruption when the staircase is installed, typically lasting 1 to 2 days. LCCL Construction works to minimise disruption to your daily life throughout the project.
Q9. Can I convert my loft into two bedrooms?
Yes, many loft conversions can accommodate two bedrooms, particularly L-shaped, mansard and larger dormer conversions. The feasibility depends on the size of your roof, the type of conversion, and building regulations requirements for fire escape, staircase positioning and minimum room sizes. LCCL Construction offers free consultations to assess what is possible for your property.
Q10. Is a loft conversion worth it in London?
Yes, a loft conversion is one of the best investments you can make in a London property. It typically adds 15 to 25 percent to your property value while costing significantly less than the value it adds. A loft conversion also avoids the cost and stress of moving to a larger home. With London property prices averaging over £500,000, a loft conversion costing £30,000 to £75,000 could add £75,000 to £125,000 in value.
Q11. How do I choose a loft conversion company in London?
When choosing a loft conversion company in London, check their experience, reviews across multiple platforms, accreditations such as LABC and NFB membership, whether they offer design and build, warranty options, portfolio of completed projects, and whether they provide fixed price quotes. LCCL Construction meets all of these criteria with over 20 years of experience, 200 plus reviews, LABC partnership and award-winning service.
Q12. What warranty options are available for loft conversions in London?
Warranty options for loft conversions in London include LABC 10-year structural warranty, insurance-backed guarantees, building regulations completion certificates, contractor workmanship guarantees and individual product warranties. LCCL Construction is an LABC Registered Partner and offers optional 10-year LABC warranties on all loft conversion projects. We also ensure every project receives a building regulations completion certificate.
Q13. Can I get a loft conversion on a terraced house in London?
Yes, terraced houses in London are ideal for loft conversions. The most popular options for terraced houses are dormer loft conversions, L-shaped loft conversions and mansard loft conversions. Rear dormers on terraced houses usually fall under permitted development and do not need planning permission. LCCL Construction has extensive experience converting lofts on Victorian and Edwardian terraced houses across London.
Q14. What is the cheapest type of loft conversion?
The cheapest type of loft conversion is a Velux or rooflight conversion, starting from £18,000 in London. This involves installing roof windows without altering the roof structure. It works best when the existing loft has at least 2.2 metres of headroom at the highest point. The next most affordable option is a dormer loft conversion starting from £30,000.
Loft Conversions Planning Permission
Information about local planning permission guidelines on loft conversions
Type of Loft Conversions
What type of loft conversions are there? Dormer Lofts, Hip to Gable Lofts
Loft Conversion Cost
How much will it cost me, what are the costs associated with the loft conversions
Loft Conversion Value
What will loft conversion add to my property value, how much value the loft add loft conversion value
Design and Build Process
Loft conversions design and build process, what are the stages of design build
Areas covering and nearby areas we cover in London and Hertfordshire
LCCL Construction covers all of London and Hertfordshire for loft conversions, 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, Friern 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, Maida Vale, Bow, Southgate, Oakwood, Radlett, Muswell Hill, Highgate, Stoke Newington, Forest Hill, Putney, 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 loft conversions. 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.
