'Conception to completion'

For all of your building needs

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Extension and cladding

Side Extension and Cedral cladding by GBM Ltd

Rear Extension

Rear House extension by GBM Ltd - Permitted development

Kitchen Extension

Site works in progress by GBM Ltd

Why Move when you can extend without any planning permission

Did you Know?

Single Storey Extensions can be built under Permitted Development

If your Single Storey Extension falls under your permitted development rights then you will not need to apply for planning consent from your local council. However, the following restrictions must be observed:

1. Cladding of the outside of your property, for example with: stone, pebble, render, timber, tiles or plastic is not PD as any materials used must closely reflect the existing materiality of the building.
2. Extensions should not exceed 50% of the land around the existing property. Remember to include any existing extensions/outbuildings in your calculation of this limit.
3. If the planned extension protrudes beyond the front or side elevation and faces a public road, then it will not be considered PD.
4. Side extensions must be a single storey and not extend beyond 50% of the width of the original property.
7. Your side extensions can be one storey, up to a maximum of 3m in height.
8. PD Rules allow a maximum eaves height of three metres if the extension is close to the plot boundary (within 2m).
9. Your single-storey rear extension can extend back from the original property by up to 3m, for a terraced house – or by up to 4m for a detached house. If it is not designated land or a site of Special Scientific Interest, you can go up to 6m or 8m metres for terraced, semi-detached and detached houses respectively under prior approval – scroll down for more information!
10. PD Rules allow a maximum height of 4m for single storey rear extensions if dual pitched, with a maximum height of 3m at the eaves. If a flat roof, this is limited to 3m across the whole extension.
11. The ridge and eaves height for an extension cannot be higher than the original property – applicable for bungalow single storey extensions!


  • Property maintenance 
  • Repairs & Refurbishment
  • Alterations
  • Home extensions
  • New-build


  • Routine maintenance
  • Office alterations
  • Dilapidation repairs
  • Landlord services
  • Programmed repairs


  • Washroom refurbishment
  • Teaching area refurbishment
  • New layout installations
  • Alterations and Repairs
  • Annual servicing

Areas covered - Hampshire, West Sussex, Surrey 
 Domestic, Commercial, Local Authority, Education, Retail, Hotels, Social Housing, Charities

Green Building Maintenance Limited     Unit 7, 48 Aston Road, Waterlooville, Hampshire, PO7 7XD