A-Spec Ltd offer a complete design to completion service for all loft conversions.

Many homeowners are turning to loft extensions and loft conversions as a way to create more living space and add value to their home. Dormers are a great way to add head room and light to an upper storey and can be a relatively inexpensive way to convert a loft into an additional bathroom, an extra bedroom or more living space.

Dormers are just one way of converting loft space and are perhaps the easiest and least expensive option when it comes to making more of cramped attic space. For more advice on converting your loft, call our expert team on 01483 301673 today.

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A dormer is a vertical window with a roof of its own positioned in the slope of a roof. Unlike roof windows, which lay flush with the roof, dormer windows project vertically and create more space and headroom.


Dormer windows offer a number of benefits, including:

  • You won’t necessarily need planning permission. Some dormer loft conversions are allowed under Permitted Development. Always check this with your local council first as in some instances, such as in conservation areas, you will need planning permission. Building Regulations Approval is required on any loft conversion, so you will still need this even if you don’t need planning permission.
  • Dormers create additional useable space. The problem with converting a loft with a sloping roof is the restricted head room. A dormer window creates additional headroom and extends the useable floor space.
  • Dormers bring in light and improve ventilation.
  • Dormers come in a choice of designs to suit your property, including gabled, hipped, flat roof, and eyebrow styles.

Gable Dormers

Gabled dormers are the perfect way to bring light into a second storey and increase the usable space within your loft. This type of dormer has a beautiful, simple aesthetic and adds an interesting architectural feature to the exterior of your home.

Gabled dormers are a popular choice and are the most common type of dormer. The traditional gabled dormer design works well with a wide array of property styles.

This type of dormer projects at a right angle to the roof. It has a peak at the top and a roof that slopes downward on either side. Because of their steeply sloping sides, gabled dormers allow water to flow easily away from your window and down the roof.

Gable Dormers in Surrey and London

Vaulted Ceiling Dormers

Vaulted ceiling dormers are very popular as the ceiling line is vastly improved creating more space within dormer.

This does not affect the external style or construction method and is very popular as an additional extra.

Vaulted Ceiling Dormers Surrey and London

Hipped Dormers

On a hipped dormer, the roof slants back as it rises, and this occurs on the front as well as the sides. The angle where the three adjacent sloping sides of the dormer roof meet is known as the hip, hence its name.

Hipped dormers provide slightly less headroom than a gabled dormer because of the slanting roof on their front side. Hipped dormers, not surprisingly, are often found on houses where the main roof is hipped as well. They are an elegant choice.

Hipped Dormers in Surrey and London


We offer a full dormer design and installation service, which we project manage meticulously from start to finish. We promise to work closely with you every step of the way to make your loft conversion journey as stress free as possible.

We have over a decade of experience in designing and building dormers for homes across Surrey, London and the whole of the South East. With our expertise you can be sure your dormer is constructed and installed to the highest possible standards. We use only the best carpenters and the most experienced joiners to bring you the highest quality workmanship.

We put you and your home at the heart of the process to ensure your dormer loft conversion is completed to the highest standards, always on time and to budget.


If you are looking to enhance the space within your loft, A-Spec Ltd can help you to realise your dream home. We offer a free quotation and will work closely with you throughout to ensure everything we do exceeds expectations every step of the way.

Dormers come in all shapes and sizes and can be difficult to get right in terms of how they blend in with the look and feel of your home. We have extensive experience in the installation of dormers in a huge range of property styles. Our expert professionals can offer guidance on the right type of dormer for your property. For dormer installers in Surrey and London you can trust call us for a free consultation and quote today.

Dormer Production Process

Our factory is equipped with skilled joiners who bring designs to life, whilst our skilled craftsmen will carefully construct your specification from the finest timbers into a beautiful looking dormer for your property or development.

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Our business is built on our exceptional reputation. We offer helpful customer service, excellent communication, and we strive to reduce our impact on the environment. We have worked on big and small loft extension projects and other home renovation work, such as home conversions, extensions, window replacement, soffit and fascia installation, decking and replacement external doors.

Our skilled carpenters and craftsmen are dedicated to providing an exceptional customer journey. Our highly skilled professional team pay meticulous attention to detail and take pleasure in all work they carry out. Our standards, expertise and professionalism really are second to none.

We have honed our manufacturing process to remove the fitting frustrations many other dormer suppliers face. We can deliver dormers fully constructed or handcraft your dormer on site. We promise:

  • Sustainably sourced FSC approved materials
  • Fitting by experienced carpenters
  • A free Site Survey and advice on design
  • A Trusted & Accredited Company for complete peace of mind
  • Aftersales support

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Dormers in Surrey & London