Permitted development is an aspect of town and country planning in the United Kingdom which allows people to undertake minor development under a deemed grant of planning permission, therefore removing the need to submit a planning application. Permitted development is currently set out in the Town, Country and City Planning (General Permitted Development) Order 1995 (amended in 2008).

Extensions at ground level are now principally governed by maximum dimensions depending upon the location and number of storeys e.g. a single storey extension to the rear of a detached house should be a maximum of 4 metres deep from the original rear wall and a maximum of 4 metres high. There are additional clauses relating to using similar materials, side windows to upper floors, eaves heights etc

Small porches (up to 3m² externally) follow the previous guidance including a maximum height of 3m and minimum distance from a highway of 2m.




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KHL Construction Ltd

General Builders, Building Contractors & Designers

We are a family firm of General Builders established over 10 years offering a friendly quality building service throughout London & The Home Counties..

We specialise in house extensions, loft conversions, and refurbishments, all to a high standard.

We also provide In-House Design as an additional service. This service complements your own projects where we prepare drawings and obtain Planning Permission and deal with all the authorities on your behalf, in order to take the worry off your shoulders.

Based in Croydon, we operate primarily in all area's in and around London.

Loft Conversions

KHL Constructions Ltd is one of the country’s most respected loft conversion companies and is considered by many as the loft conversion authority.

Not all Loft conversions require planning permission, but all do require that the loft conversion is carried out according to strict building regulations which is what KHL Constructions Ltd are renowned for.. Permitted development enables you to build up to 70% or 50% in some cases of your property before you need planning permission. These details may vary in some conservation areas.

  • 10 yr Guarantee
  • Free no obligation estimate
  • Fibreglass roof and wet rooms
  • Full plans to final plaster
  • Building regulations and Planning made easy

Home Extensions

KHL Constructions Ltd specialise in single storey, one or two room, contemporary house extensions (similar to conservatories or sun lounges), but with solid walls and roofs, allowing you to enjoy the space 365 days a year. We can even create you a 2 or 3 metre opening at the back or side of your house if existing openings do not exist.

  • Fast Construction Time - your floor, walls and roof will be manufactured on-site.
  • No Planning Permission Required - your home extension will meet all current building regulations and most do not require planning permission.
  • Complete Design, Fabrication and Installation Service - at The Home Extension Company® we provide a complete service from the initial design through to installation in a quick and painless manner.
  • 10 Year Guarantee!