London's Premier Loft Conversion & Extension Specialists

With over 30 years of experience in the construction industry,  LMB Group deliver high quality materials and workmanship for your project. Send us your plans and we’ll transform your vision to fruition. 

We are conducting surveys in line with the Government guidelines. This includes social distancing measures- prior to entering your home.

Reviews and Testimonials

Loft Conversions in London

LMB Group is a family run business committed to quality workmanship and customer service. For over 30 years we have been designing and building incredible space-enhancing loft conversions for both domestic and commercial clients.

We have a team of fully qualified professionals who are all health & safety trained to work within people’s homes, and with over 30 years in the industry, we have obtained various accreditations from leading bodies such as CHAS (The Contractors Health and Safety Assessment Scheme). We are also part of the IWA scheme which has deposit protection and a 10-year insurance-backed guarantee so you can put your confidence in us to provide you with nothing but beautiful, inspiring transformations.

When you choose LMB Group Ltd you can expect to meet a team of friendly, trained professionals that’ll be with you every step of the way, so your conversion exceeds all your expectations. We offer a free survey and a written quotation, full 10-year guarantee and we have a comprehensive portfolio including bungalow loft conversionshome extensions and balconies for you to browse through – you can even arrange to meet our previous clients!

If you would like to know more about us and our services, please feel free to contact us today where a member of our team will be happy to answer any questions. Read our update to see how we’re responding to Coronavirus (Covid-19).

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Types of Conversion

Loft conversions

Dormer Conversions

Dormer loft conversions are a box structure added to a pitched roof. They can help to expand both headspace and floorspace.

Dormer Conversions

Mansard Conversions

Mansard extensions run along the entire length of your property's roof and will alter the pitch of the roof.


Velux Windows

Also known as roof lights, Velux is the leading manufacturer of roof windows and blinds. We're Velux-certified installers too.


L-Shaped Dormer

L-shaped dormer conversions are popular with period properties and often allow for multiple rooms.

hip to gable

Hip-to-Gable Conversion

Hip-to-gable conversions extend your property on the sloping side, effectively replacing the slope of the roof with a vertical wall.

get a loft conversion quote

Get a Quote

Speak to our friendly and knowledgeable team today for more information and a free quote.

Choose LMB for Quality and Service

Free survey and written quotation

Full deposit protection guarantee

Professional expert advice given

Fully Qualified and approved staff

10 year insurance-backed guarantee

Fully-staffed office Monday - Friday