Welcome to A1 Loft Conversions and Extensions

We are the leading experts in loft conversions, extensions and refurbishments, committed to providing our customers with the highest level of service and construction possible.  Our extensive portfolio of satisfied loft conversions and house extension clients reflects our dedication in providing a first class service.

We cover Surrey, Hampshire, the home counties, London and surrounding areas.

Contact us for a quote today!

Benefits of a Loft Conversion or Extension

With high quality loft conversions or house extensions, you can increase the value of your home as well as increase your living space. As one of the UK’s most popular forms of home improvement, loft conversions and house extensions can make wasted space practical and by installing loft insulation you can reduce your energy bills.

With house prices on the rise and the high cost of moving, a loft conversion or extension could also have a number of financial benefits, including providing a space for rental income.

There are also so many potential eco-friendly options to a loft conversion:

Solar Panels which can lower or even eliminate your monthly electricity bills.

Insulation and Ventilation: for our eco-lofts we provide the options of ‘Vacuum Insulation Panels’ and ‘Mechanical Ventilation with Heat Recovery’.

Under Floor Heating: As under-floor heating is economical with the most efficient types being water and electrical, it can easily be linked into a solar panel if you wish.

Green Roofs: Green/Living roofs have the capability of introducing a whole range of plant species from mosses, ferns, orchids, tropical plant species, sedums, herbs and edible plants grown organically.

Water Harvesting: Rainwater harvesting can cut the amount of water that a home uses from their water supplier by up to 50%.

Contact us today to find out how a loft conversion can improve your home!

What are the different types of loft conversion?

A1 Loft Conversions offer Loft Conversions in Surrey, London & surrounding areas. There are a number of types of loft conversion. Which type you have for your home will be dependent on a number of factors such as planning permission, house type, conservation areas, roof height and available space. The main types of loft conversion are below, it is important to consider that these can then be adapted and made bespoke to suit your home.

Contact us today to find out what type of loft conversion would be ideal for your home!

Rear Dormer

Rear Dormer

A dormer loft conversion is an extension to the existing roof, creating additional floor space and headroom within the loft conversion. Dormers can be built in various styles, but all extend from the roof slope, usually in a box shape.

The process for building a rear dormer is simpler than most extensions. Many people choose to have a  dormer because of the options it can bring. Space is a key reason for having a rear dormer extension. Whether you need a new bedroom or a study if you’re working from home, the possibilities are endless.



A mansard loft conversion has two slopes with the top section of the roof being almost horizontal.  A mansard roof has the advantage of maximizing the available space within your loft.

A mansard loft conversion has a flat roof with the back sloping inwards at 72 degrees. The reason for this is due to planning criteria as the councils view 72 degrees as a roof, rather than a wall, allowing for the build to incorporate as much space across the conversion as possible. The windows built into the loft conversion are constructed as small dormers.

Hip to Gable

Hip To Gable

A hip to gable loft conversion involves making fairly major changes to the roof. As a general rule, houses with a hip roof tend to not have enough internal space to be a loft conversion to be practical, making a hip to gable conversion the perfect solution.

A hip to gable loft conversion involves making fairly major changes to the roof. As a general rule, houses with a hip roof tend to not have enough internal space for a loft conversion to be practical, making a hip to gable conversion the perfect solution.

Velux Conversion


Velux loft conversions very rarely require planning permission. Velux are the leading manufacturer of roof windows with over 60 years experience, and A1 are the largest independent client of VELUX products. This type of conversion is generally very cost effective.

A Velux loft conversion requires considerably less construction work than a dormer or other types of conversion.  You can add an extra bedroom, living room or office cheaply and quickly – and start enjoying your new conversion within weeks.

Why A1?

  • Over 2,500 completed projects throughout Surrey, Hampshire, London and the home counties!
  • In our 17th consecutive year of operations
  • 98% of our clients recommend us to family and friends
  • The majority of our work comes through customer referrals
  • Over 250 client show homes to visit, unescorted
  • Your money is safe with the A1 secure payment process
  • Customer Service is our number 1 priority – we take the customer step by step through their project giving them complete transparency of operations and ultimate control throughout, managing each project from start to finish
  • Choice – From a variety of services to the whole package – it’s your choice. We interpret your ideas, advise on the best solution and create your dream loft
  • Superior Design – our experienced designers will work with you to provide innovative solutions for your space and design
  • We provide comprehensive 10 year company backed guarantees as standard to all our clients at the time of contract, for complete peace of mind.
  • Velux VIP Installer 2013, Best of Houzz 2015 Design, Certified Installer Velux & ISO 9001 Accreditation


As you can see we have a vast array of previous loft conversion clients right across Surrey and South West London.

From Hip to Gable’s in Hampton Court & Guildford; Mansard’s in Malden; Velux’s in Virginia Water & Rear Dormer’s in Richmond & The Dittons

Contact us today to join our list of happy customers!