Our services include loft conversions, house extensions, architectural design and custom house builders


architecture and construction solutions, design and build company London, UK

Lccl are a full service architecture and construction company located in Finchley, London N3 United Kingdom. From traditional to contemporary, we are experts at creating unique spaces that match your unique style and needs.

" We hold £5m Public Insurance

£10m Employers and All Risk Total Insurance to give you a peace of Mind! " 

“Professional contractors offering support to residential customers. 35+ years Experience.” 

House extension builders
- rear and side house extension builders
- wrap around and side return house extension
- two storey house extension builders
- optional LABC 10 year warranty
- plumbing and electrical packages
- design and build company in London
- New permitted development rules applied
Loft conversion company
- dormer and hip to gable loft conversion
- mansard lofts and L shaped loft conversion
- velux loft conversion
- optional LABC 10 year warranty
- plumbing and electrical packages
- design and build loft company london
- new permitted development rules applied
Design and build
- design and build company in London, UK
- design and build of loft conversions
- design and build of house extensions
- design and build new houses
- optional LABC 10 year warranty
- local authority building control partner
- party wall and structural drawings
New build homes
- new home build schemes
- design and construction
- architecture design and planning
- LABC 10 year warranty
- no deposit required
- plumbing and electrical packages
- New permitted development rules applied
Home renovation
- Flat and Apartment Renovations
- House Renovations
- Design and Build
- Plumbing and Electricals
Supply and Install Kitchens, Bathrooms, Flooring, Doors or Wardrobes
Total finishing options
Architecture design services
- Architecture, Design and Planning
- Measured building survey
- Schematic drawings
- Consultation and Party Wall Agreements
- Project Management
- Structural Drawings and Calculations
- Planning and Building Control Application
Show More

Get instant quote for your loft conversion, home extension, renovation or new build including architecture and design build

Type of projects we do including architecture and construction, get your instant design and build quote 

  • rear_home_extension.png

    Home extensions

    • Rear home extension

    • Side home extension

    • Side and rear extension

    • Wraparound 

    • Side return 

    • Two storey side

    • Two storey rear

    • Two storey wrap

    • First floor extension

    • Upward extensions

  • Loft_conversion_company.png

    Loft conversions


    • Dormer loft conversion

    • Hip to gable loft conversion

    • L shaped loft conversion

    • Mansard loft conversion

    • Velux loft conversion

  • Renovation 


    • Flat or apartment renovation

    • House renovation

  • Basement conversion 


    • Full house basement

    • Part house basement 

    • Outrigger basement

  • New-build-cost.png

    New build 


    • Detached homes

    • Terraced homes

    • Flats

    Book consultation call for new build projects.

    book consultation call >

New permitted development rights and type of upward extension on homes that are possible in England

You can add additional two storeys to houses in England without needing planning permission.

Book free consultation call to find out what is possible and how we can help.

Learn about the new permitted development rights that allow

upward extensions on existing homes. Your house can't be in protected area, and it has to have been built between July 1948 and 2018.

  • Bungalow upward single storey extension.

  • Terraced house upward single storey extension

  • Detached up to two storey upward extension

  • Semi detached single storey upward extension

What is the design and build process
How does it work?

What is the design and build process

Lccl Construction Company Services

Start your project today

Our services area for loft conversions, house extensions and architecture services, if your area is not listed ask if we cover your area: 

loft conversions london

loft conversions hertfordshire 

loft conversions north london

loft conversions east london

loft conversions south london

loft conversions west london

loft conversions essex

house extensions london

house extensions hertfordshire 

house extensions north london

house extensions east london

house extensions south london

house extensions west london

house extensions essex

architectural design london

architectural design hertfordshire 

architectural design north london

architectural design east london

architectural design south london

architectural design west london

architectural design essex

You can dive right on in and get started or get to know us better

Get a quick quote

Understand potential budget requirements in seconds with this easy instant online quote tool.


What are the stages in architecture, examples of the drawings, about the type of loft conversions and house extension.

Get free advice

It does not matter at what stage you are in book with us a consultation call online it is quick and simple, free of charge.

Loft Conversions

What are the different types of loft conversions, costs associated and return on investment, locations we operate in. 

Get Inspired

Have you seen our portfolio? we would pretty much have any type of project you could wish for, get inspired follow the link.

House Extensions

Types of house extension, what do they cost, where we build house extensions, value of house extensions.

Finchley, London Office Location:

3rd Floor, Hathway House, Popes Dr, Finchley, London N3 1QF



020 8037 7332

Office Hours:

Monday to Saturday 8AM - 6PM

Sunday - Closed

Registered company England:

Loft Conversion Company London Limited. Trading as "Lccl Construction" Registration: 11713461

Accreditation, partnerships and planning:

Planning Portal
Lodon and Hertforshire Construction Awards

Lccl Construction. Specialist loft conversion company, house extension builders, architectural design and planning. Design and build construction company from start to finish including architecture, planning, building control, party walls, structural calculations, project management, construction and finishing.

Connect with us on social media:

  • Facebook social icon lccl construction
  • You tube social icon lccl construction
  • Instagram lccl construction
  • Twitter social icon lccl construction
  • lccl construction houzz
  • linkedIn social
  • Pinterest social icon lccl construction
  • RSS social

Copyright 2006 - 2021 all rights received. Architecture services, house extension builders, loft conversion company and design and build company London & Hertfordshire, United Kingdom. By using our services you agree to our privacy policy and terms and conditions.