Loft Conversions

Mars Building Ltd - Loft Conversions

Under new regulations that came into effect from 1 October 2008 a loft conversion is increasingly becoming the most popular way to add the extra space you need in your home, whilst adding value at the same time.

Mars Building Ltd are able to offer a full Loft Conversion service, from an initial no obligation consultation to designing with our architect and then project management and construction of your loft from start to finish.

Planning Permission

Planning permission is not normally required. However, permission is required where you extend or alter the roof space and it exceeds specified limits and conditions.
Under new regulations that came into effect from 1 October 2008 a loft conversion for your home is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:

  • A volume allowance of 40 cubic metres for terraced houses.
  • A volume allowance of 50 cubic metres for detached and semi-detached houses.
  • No extension to be higher than the highest part of the roof.
  • Materials to be similar in appearance to the existing house.
  • No verandas, balconies or raised platforms.
  • Side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor.
  • Roof extensions not to be permitted development in designated areas*.
  • Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the eaves.



    • Mars Building (house building, domestic extensions and building works), Groundwork and Demolition Services throughout Hertfordshire (Herts), Knebworth, Welwyn, Stevenage, St Albans, Hertford, Hatfield, Welwyn Garden City, Harpenden, Potters Bar, Brookmans Park and surrounding areas provided by MARS Builders

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    Why Choose Mars Building Ltd?

    Our Customer Satisfaction Promise:

    Mars Building Ltd has been built on reputation; we know that we are only as good as our last job so with our building projects you get:

    No hidden extras

    When we price a building job, we provide a detailed quotation, so you will know exactly what is and what is not included. This means there is no question of any hidden extras!

    Quality assured

    All our builders and tradesmen are fully qualified and experienced. They have worked together for many years.

    Everyone works to the same high standards, with the same aim - to achieve the best possible results with complete customer satisfaction.

    Service you can rely on

    We know that once your house and life have been disrupted by the start of building work, the last thing you want is for nothing to happen for days or even weeks on end. With Mars Builders this does not happen.

    We only take on building projects which we are sure we can cope with, which ensures that we can achieve full continuity of work on all our contracts.

    Please call us:
    Tel : 01438 812949
    Mobile : 07956 503162

    Feel free to contact us regarding any of our services. We have a friendly team that are always happy to help in whatever way we can.

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