This recently completed project located in the London Borough of Kingston Upon Thames is spread between two semi-detached Victorian properties which both sought to extend their roof spaces.

The properties already benefitted from handsome elevations and styling which called for a modern addition to avoid any pastiche details which could have been harmful to the character of their original elevations. We worked carefully to extend the roof spaces to create much needed extra accommodation with dramatic views over their large rear gardens and towards Hampton Court Park and Palace.

The new space is formed by the extension of the hipped roof to dual gable ends, with a long rear dormer which opens out onto two roof new balcony spaces finished with structural glass balustrades.

The new dormer, though long, reads as four small dormers; this was carefully designed to reduce visual impact. The four dormers are joined together with a mansard roof which gives the illusion that the dormers are separate instead of one long expanse of new roof space, whilst internally, the expanse is apparent. Both properties, though internally are configured slightly differently, have achieved two new rooms with 2 new bathrooms / En-suites. One of the clients chose to convert their second “bedroom” into a light filled yoga room for their home business. This space turned out particularly successful as we chose to open up the space to the stair well instead of walling it off into a separate room; the space reads as much larger and far more dramatic which creates a peaceful and bright environment for yoga instruction towards the front of the property.

The use of zinc on the flat roof construction gives a sleek and contemporary finish to the extension which reads as complimentary to the original house as opposed to competing with the existing character. The use of zinc is also a reference to the historical material palette of the area that includes lead rolled mansard roofs. As well as this, the construction type and detailing ensures longevity; the extension will age without the materials decaying ensuring the crisp finish remains for years to come.

In terms of acquiring planning permission, Square One Architects followed a formal process with the local council which involved a pre-planning application advice process prior to applying for formal permissions. Usually, obtaining permission for a balcony with any local authority is a contentious issue and is unlikely to gain approval, but in this case, we were able to justify our proposals and gain the approvals our clients desired.

Overall, the project is a huge success and we are incredibly pleased with the outcome. Square One were involved throughout the entire process from conception to completion which ensured the quality of the design was translated from the original ideas and details into quality on site construction and finishing.