We serve private sectors loft conversions, home extensions, renovations and new builds

Lccl delivers building projects in private sectors. We are a multi skilled construction company delivering design, build and management services to diverse range of clients. 

Sectors we cover are residential.

Lccl construction design and build in London and Hertfordshire, United Kingdom is a specialist loft conversion company, house extension builders, architectural designers and planning company. With our end to end services we successfully start and finish every one of our projects. With our design and build construction company services we can complete all the stages of your build from consultation to construction including plumbing and electrical installations under one roof. Our combined services includes planning, architectural design and construction. 

By providing services from start to finish we will deal with architecture, planning applications, planning negotiations, building control drawings, building control application, party wall survey and agreements, structural and construction drawings, production of the construction schedule, interior design, construction phase, dealing with building control during construction, electrical and plumbing installations, completion of the construction, certificate and Local Authority Building Control sign off. 

We cover all areas in London, Hertfordshire, United Kingdom. Our offices are located in 3rd Floor, Hathway House, Popes Drive, Finchley, London N3 1QF. The radius is 85 miles from our office location. Our phone number is: 020 8037 7332

What is a design and build company?

The design and build concept means that multiple specialist skills are combined into one, from one company that will deal with all the architecture, consultation, planning and thereafter the entirety of the  construction, saving both time and capital.

We will help you plan, design and build your house extension or loft conversion every step of the way. 


Find out more about successfully completed Lccl Construction design and build projects portfolio click here

Lccl Construction is registered company and trading under Loft Conversion Company London Limited, Company House number: 11713461 

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

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    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

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    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

Get started or get to know us better, we are sure we will be able to help you..

check out our knowledge base 

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, more about the type of loft conversions and house extensions.

Get free advice

Whatever stage you are at in your project book in with us for a free consultation call online. It is quick and simple and 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  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.

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