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Private Build Extensions

Single Storey Extensions

Single storey extensions are the most popular type of extension in the UK. These are usually positioned on the side or rear of your home and traditionally have a flat roof. Although recently we have seen an increasing preference for pitched roofs, which blend better with the existing building.

Double Storey Extensions

Double storey extension are a particularly sound investment as often UK properties tend to be valued on the number of bedrooms, rather than the total area of floor space . It is likely that you will need to liaise with your local planning and building control departments when adding an extension. kjp can manage the complete process - from design to approval - as part of its service.

Loft Conversions

By converting your loft you can quickly and cheaply create a whole new floor in your home. This will add instant value to your house and provide extra space for another bedroom, a play room or just more living space to relax in.

Most UK houses built before 1965 are suitable for a standard loft conversion. The main specification is that the height from the loft floor to the roofs apex must measure at least 2.3m (7ft 6”).

Loft Types:

  • Velux Conversions
  • Mansard Conversions
  • Domer Conversions
  • Hip to Gable Conversions


Digging down under your house and even into your garden can create a huge new living space for your family. Basements can be used for a wide range of purposes including a separate self contained flat, a den for teenagers or even, at the top end of the market, an indoor swimming pool.

In Towns and Cities where space is at a premium, the addition of a ‘retrofit’ basement can give you the freedom to expand your property as far as your garden or your budget allows. We provide everything from underpinning, piling, ground works and bulk excavation, to designing, lighting, painting and finishing your new basement.

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