Loft Conversions London, Builder, Refurbishments, Extensions and Construction
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Loft Conversions London


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Loft Conversions London Building Contractors Refurbishments  Local Builder Extensions JGA Construction

London Builder - Loft Conversion Design Ideas, Dormer, Hip to Gable, Velux Roof Windows, Mansard


Our builders cover Bromley, Bexley, Dartford, Lewisham, Greenwich and London

JGA’s team of loft conversion specialists include: builders, designers, architects, specialist Velux roof window fitters, Corgi registered gas fitters and qualified electricians. Our previous work has included the following: specialist lead work, refurbishments and renovation, new and specialised builds and of course our most popular work; extensions and Loft Conversion. We will discuss with you your loft conversion ideas, compatible designs and the costs. Our Attic and Loft extensions generally include some of the following four different Loft Conversion types, there are variations on these themes to accommodate your ideas and any potential constraints.

Rooflight - Velux Loft Conversions



With the roofline or Velux conversion, a room is simply created in your loft space. Your roof is not altered. This type of conversion may most be suited to a listed building or Victorian house where planning permission may be restrictive or perhaps you may not want to drastically alter the line of your roof or the exterior shape of your home and so this would be your best choice. Velux Roof Windows and rooflights fitted by our roofers and builders represent a cost effective standard in performance, durability, functionality and visual design for a loft conversion.

Velux Windows and Velux Blinds are simple to operate. There is a full range of accessories to make roof windows more security user friendly to operate. The accesories include rod controls for out-of-reach windows, security lock systems, and opening restrictors,

Mansard Loft Conversion



This type of construction is typically on the rear of your property with windows housed in small dormers protruding from the roofline. This type of extension to your house, will give your home character. Generally the Mansard design achieves an understated look


A mansard roof has two slopes, the lower slope is close to vertical at 72 degrees, and the top section of the roof line is almost horizontal. This style of roof is named after the 17th-century French architect Francois Mansart (1598-1666) who used this design of roof on many buildings in and around Paris. A mansard roof conversion has the benefit of maximising the available space within your loft space compared to other attic conversions.


Mansard Loft Conversions are commonly built by raising the gable end or party walls either side of your house to accommodate the profile for the mansard style and then creating and constructing the necessary timber frame mansard trusses. Although common on older properties, especially in cities like London, Mansards are not seen quite so often in the outer suburbs. Due to the scope of alteration to the roofline, a Mansard loft extension will probably require planning permission, as your London builder we can provide you with considerable support for this in navigating the Building Control, planning and permit process.

Mansard Loft Conversion



This type of extension is used to create a large space and usually a stair case. The outside space of your property will change. If you previously had a sloping roof, the roof will then become flat.


A Hip to Gable conversion involves making fairly substantial changes to your roof. This is where the ridge line of a hip-end roof is extended to make a gable-end roof. The gable wall is built up to the ridge line and the roof is extended to fill the gap. The gable wall is normally built out of masonary or stud-work, there are various options for finishing off masonary gable walls such as brick work, block work with render or tiles. If your gable wall is built out of stud-work then the general finish is render or tiles. A hip to gable is the best solution for houses with hip roofs as they tend to not have enough internal volume for a conversion to be practical.

Rear Dormer Loft Conversions



This is the type of extension you have, if you desire a large amount of floor space. This type of extension will give you many options and possible multiple rooms. The Rear Dormer can be done on almost all properties.


Dormer loft conversions are an extension to the existing roof. This creates a substantial amount of extra floor space and height. It is possible on most terraced and semi detached properties. Planning permission will be required, larger dormer loft conversions normally come with flat roofs as having a pitched roof normally exceeds the height of the existing roof. Although flat roofs give you the maximum amount of internal ceiling height they are not as attractive from the outside of the property.


Front and Side Dormer conversions are typically smaller extensions and will generally be in keeping with the character of your home.

Loft Stairs



JGA have individually designed and constructed a great number of loft stair cases over the years. Again our design team can tailor make your staircase to suit your requirements.