14 years of



Covering London and Hertfordshire, United kingdom. Type of house extension we design and build:

  • Single storey rear house extensions

  • Single storey side house extensions

  • Two storey house extensions

  • Wrap around house extensions

  • Side return house extensions

  • House extension builders

  • Based in Barnet and Borehamwood Covering London and Hertfordshire


House Extensions

Design and build of rear house extensions in London and Hertfordshire.

Wrap a Round

House Extensions

Design and build of wrap a round house extensions in London and Hertfordshire.

Side House Extensions

Design and build of side house extensions in London and Hertfordshire.

Side Return

House Extensions

Design and build of side return house extensions in London and Hertfordshire.

East Finchley, London N2 House Extension Project

Architecture design and build of the house extension located in North London. 

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 click here >

House Extension


How much will it cost me, what are the costs associated with the house extensions find out >

Type of House Extensions

What type of house extensions are there? Single Storey, Side Return find out more >

House Extension Value

What will house extension add to my property value, house extension value find out >

House Extensions Service Locations

What areas in London and Hertfordshire do we cover. Find out more click here >

Design and Build Process

House extensions design and build process, what are the stages of design build find out >

We are a certified, accredited and fully insured company delivering construction services across London, Hertfordshire, North London and North West London. The specific areas of our house extension building services would include in Barnet, Borehamwood, Elstree, Hadley Wood, Cockfosters, East Barnet, Bushey, Finchley, St Albans, Potters Bar, Brent, Hampstead, Westminister, Chelsea, Ealing and Enfield. We are fully complaint with government and industry standards.

We build all types of extensions to highest standards single story extensions, double story extensions, triple story extensions, side and rear extensions, kitchen extensions, front extensions, loft extensions, loft conversions, wraparound house extensions full refurbishments and much more.

Lccl Construction is a responsible house extensions builder delivering responsible construction services that our customers can rely on and to rest assure the peace of mind we warranty our work for 10 years. 

Looking to get started?

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House extension builders locations for London, UK and Hertfordshire, UK that we cover for house extensions. If the area is not listed on the below locations, give us a call to check whether we cover your location, we cover all areas in London and Hertfordshire.

The loft conversions locations for London, United Kingdom:

house extension builders lewisham

house extension builders eltham

house extension builders clapham

house extension builders richmond

house extension builders twickneham

house extension builders wandsworth

house extension builders brent

house extension builders southgate

house extension builders totteridge 

house extension builders crouch end

house extension builders chalk farm

house extension builders dulwich

house extension builders rickmansworth

house extension builders camberwell

house extension builders kentish town

house extension builders stratford

house extension builders fulham

house extension builders battersea

house extension builders pimlico

house extension builders westminster

house extension builders high barnet 

house extension builders stanmore

The loft conversions locations for Hertfordshire, United Kingdom:

house extension builders hertfrodshire 

house extension builders borehamwood

house extension builders potters bar

house extension builders st albans

house extension builders radlett

house extension builders watford

house extension builders northaw

house extension builders cuffley

house extension builders goffs oak

house extension builders brookmans park

house extension builders cheshunt

Borehamwood, Hertfordshire Office Location:

Unit 720 Catalyst House, Centennial Park, Centennial Avenue, Borehamwood, WD6 3SY

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:

North London Loft Conversions Ltd. Trading as "Lccl Construction" Registration: 11713461

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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.

Accreditation, partnerships and planning:

Planning Portal
Lodon and Hertforshire Construction Awards

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