Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Call 020 8037 7332 or get an instant estimate online.

A 3 × 10 m single-storey rear extension on a modern semi in Millbrook Park: a large kitchen and dining space with bifold doors and skylights, and a separate utility room so the kitchen stays quieter and gains cupboard space. Scheduled for 12 weeks, finished in 10.
Project facts
- House2000s semi-detached
- Added+500 sq ft (3 × 10 m)
- On site10 weeks
- Completed2023
- PlanningPermitted development
- Contract value£100,000 – £150,000 inc. VAT
Built under permitted development. No planning application was needed: the design was kept inside the permitted development limits. How permitted development loft and extension projects work
Project type: Kitchen extension · Area: Mill Hill NW7
What we did
- 3 × 10 m single-storey rear extension
- Large modern kitchen and dining space
- Separate utility room
- Bifold doors and skylights
- Underfloor heating, fully tiled floor
- Landscaping
Specification
Wren kitchen · Underfloor heating · Bifold doors · Skylights · Fully tiled floor · Landscaping
Design and build inclusive: architecture, structural engineering, planning, party wall, construction, project management and LABC sign-off under one contract.
Anderson's note
On a house this new the ground floor is already open, so the job is really about the roof and the light: we put the skylights over the island before the kitchen layout was fixed, not after.
Anderson, founder — LCCL Construction, Finchley N3
The client's view
“We did a 3 × 10 m single storey rear extension with LCCL recently. It was scheduled to take 12 weeks to complete but with Alex's experience and agile project management we finished in 10. Alex and LCCL are extremely knowledgeable and will work with you explaining what can, and cannot, be done and why. With Alex you know no corners will be cut: your house will be sturdy, warm, waterproof, and will look nice. Without doubt I would choose LCCL again for any future building project.”
Verified client · Google Reviews
As LABC Building Excellence Award Winners 2024 for Best Residential Extension in London, and 2026 London Regional Winners for Best Conversion or Alteration, every project runs under one contract with a 12-month workmanship guarantee and a 10-year LABC structural warranty.
One team, one contract, one point of contact — from first sketch to handover.

“We used Lccl construction first time for our kitchen extension 2019 with a view to build a loft conversion afterwards. We just have had our loft conversion completed including bedroom, bathroom, storage loft it has Juliet balcony with velux windows to the…”
Tracie · Trustpilot
“We engaged with LCCL Construction to get our loft conversion and house extension project going. The whole process was explained to us in a straight forward way including how the design stages work, timescales, what to expect during the build and the costs…”
Daniel Freedman · Trustpilot
“I highly recommend LCCL Construction. They completed our loft conversion to a very high standard, and the quality of workmanship throughout was excellent. The team was professional, reliable, and completed everything within a very reasonable timeframe.…”
Alina A · Google Reviews






