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Lccl construction design and build

Lccl Construction 
Loft conversion company 
House extension builders
Design and build

Transform your home into your dream space with Lccl Construction Loft Conversion Company London Limited! Our experienced team specializes in loft conversions, house extensions, and architectural design services to help you create the perfect living space. Let us bring your ideas to life!

Covering London and Hertfordshire, United Kingdom and Surrounding Areas

Located in Finchley, N3 London

Lccl Construction National Federation of Builders
Labc building excellence awards 2024
Planning Portal
Best of Houzz awards 2024 Lccl Construction
Lccl construction on houzz
LABC Registered Partner Lccl Construction

House Renovations design and build, total house renovations and remodel, bathroom and kitchen renovations, electrical and plumbing

interiors renovations

Terraced house new build and design

Semi detatched house new build

Detatched house new build

Residential new house builders

Commercial to Residential

Lccl Construction Design And Build
Rear house extension builders London
Loft conversions design build
Kitchen house extension builders

Specialist Design and Build Construction Company 

Lccl Construction Loft Conversion Company London is your go-to architecture and construction service provider. We specialize in home-improvement projects such as loft conversions, house extensions, new house builders, architectural design, house renovations and offer our services in an 85 mile radius from our offices location in Finchley, London, meaning you're never far away from our team of experienced professionals.

Types of projects we work on:

Architectural design and construction of house extensions. Rear single storey house extensions, side house extensions, wrap around house extensions, side return house extensions, two storey house extensions. We design and build house extensions in London and Hertfordshire.

Architectural design and construction of loft conversions. Dormer loft conversion, hip to gable loft conversions, L-shaped loft conversion, mansard loft conversion or velux loft conversion. We design and build loft conversions in London and Hertfordshire.

Architectural design services for loft conversions, house extensions and new build houses. Complete consultation package London and Hertfordshire, United Kingdom.

Renovation company London, total renovation solutions, including kitchen renovation, bathroom renovation London and Hertfordshire, United Kingdom.

We can serve party wall notices, serve full party wall awards, liaison with 3rd party surveyors. Our party wall agreement services are conducted by surveyor who is MCIOB and FPWS accredited.

Find out more about our construction process and stages, how do we go about running our construction project and what are the core elements associated in the construction process.

We can project manage your project on your behalf, with our construction management services we build loft conversions, home extensions, renovations and new builds.

Our structural engineers produce structural design and structural calculations for your loft conversion, home extension, renovation or new build. 

New build scheme solution, we design and build your new house, our solutions of architecture and construction for new build homes, find out more.

Architecture and Construction Services

Lccl Construction unique construction process and design and build process for loft conversion and home extension 

Find out more about Lccl Construction unique construction process or design and build process and what happens on the design or construction stage. 

Step by step explanation of loft conversion, home extension and new build design and construction process. 

We have included our original project images taken on our construction projects.

Lccl construction loft conversion company design and build in London and Hertfordshire, United Kingdom is a specialist loft conversion company, house extension builders, new house builder, 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, architecture, survey 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. 

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

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: Phone 020 8037 7332

What is a design and build company?

The design and build concept means that multiple specialist skills and trades are combined into one, from start to finish we 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

Design and build company London


measured survey



lead consultant



party wall agreements

structural engineer drawings

Design phase

Construction phase

Your project

Architectural design, survey and construction services under one umbrella

We are your one stop architectural design, survey, project management, construction services company. We take care of everything required for your loft conversion, home extension or renovation project. Meaning we will complete the design phase and construction phase for you, without the need to look anywhere else and you have only one point of contact for everything.

Design phase: 

  • Building measured survey

  • Architecture services

  • Planning application

  • Building control application

  • Party wall agreements 

  • Structural engineers calculations and design

  • Project management

  • Interiors


Construction Phase:

  • Construction of loft conversions and home extensions

  • Project management

  • Logistical supply and coordination

  • Quality control

  • Liaison with building control and inspection

  • Guarantee

your project step by step...

Free consultation call

Lccl Construction Loft Conversion Company London provides the highest quality of construction and loft conversion services for homeowners who are looking to upgrade their living space. With a great track record and a professional team of experts, we offer a totally free consultation call to help you talk through ideas, issues and aims for your project. With our professional advice and expertise, you can take one step closer to achieving the home of your dreams! Book a free consultation call now and let us help you make it happen.

Instant quote online

Curious about the cost of your loft conversion, house extension or renovation? With our online quote calculator you can find out anytime of the day or night from the comfort of your own home what the approximate cost of our Architecture services or Design and Build services are. Helping you to make an informed choice about your next steps.

Staggered payments

We do not ask for any large payments up front. Our payments are transparent and divided into reasonable stages. As the work progresses you will make payments relating to the progression of the project. Our payments are broken down into manageable intervals, the payment schedule is produced once you go ahead with our services.

Communication is key

We have created our very own online dashboard. This enables you to easily keep up to date with the progress being made on your project. It also makes it easy for you to get in touch with our team anytime that suits you.

Located in Finchley, London N3

We are local and we cover London and Hertfordshire, this is a major advantage for the smooth running and delivery of your project as we are local to you. We cover an 85 mile radius from our base in Finchley, London N3. We have in-depth knowledge of the London and Hertfordshire area for architecture, survey, loft conversions or home extensions design and build.

Get to know what type of loft conversions and home extensions there are, understand the planning permissions impact of the context.

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In short there are 10 stages of the design and build process. Starting with a contact, consultation, quote, full survey, planning permission drawings, building regulation drawings, structural calculation drawings, party wall agreements and construction.


Lccl Construction is one of the  leading construction companies in North London,construction companies in London and construction companies in Hertfordshire, United Kingdom. We are a specialist loft conversion company, house extension builders, design and build company London. With our architecture services, design and build solutions we are able to deliver any type of loft conversion, house extension, both in the London and Hertfordshire areas.

Have a look at the design and build process stages in more detail lccl construction design and build process

Why choose Lccl construction for your loft conversion or house extension

At Lccl Construction we have carried out many design and build loft conversions and house extension projects in London, Hertfordshire, United Kingdom. We design and build London loft conversions turning them into beautiful spaces. Our aim is to make the process of house extensions or loft conversions as simple as possible, hassle free and stress free for a loft conversion in London and house extension in London.


Some of the customers that live in London and Hertfordshire are looking for extra space due to a growing family or the need for additional space for a home office or some like to invest in their property. Whatever the reason we design and build loft conversions in North London, London and Hertfordshire.

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Loft Conversion and Home Extension in North London

Seven reasons to choose

LCCL Construction

1. Insured, Registered and Accredited Construction Company

2. Total Architecture, Construction and M&E Services Under One Roof

3. Fully Detailed Quotes on Small, Mid & Large Projects

4. Efficient and Professional services

5. Located locally London, United Kingdom 

6. Small Deposit

7. Optional LABC Warranty 10 - 12 years

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