BASEMENT EXTENSIONS
Biocraft carries out basement excavation, basement extensions and basement construction throughout Berkshire, Oxfordshire, Surrey, and Hampshire. Existing basements can be enlarged or extended to provide significant additional living space. Alternatively new build basements can be incorporated into a rear or side extension or a basement space create under an existing building.
For more information please call 0800 781 8358 or email survey@biocraft.co.uk.
BENEFITS OF BASEMENT EXTENSIONS
Basement extensions can add significant useable space to your home. A professionally constructed basement can be used as an office, a playroom, a bedroom, a basement studio, a home office or a home theatre. A basement extension can add up to 30% floor space to your home and will add value to your home (usually 30-50% more than the basement project cost).
Incorporating a basement into your extension project can be a cost effective way of gaining a significant increase in floor area with a relatively small increase in the overall building costs. The newly constructed basement acts as the foundations for the extension and therefore the additional cost of the basement will be in the region of 10-20% of the original project cost.

Basement extensions added during refurbishments or rear/side extensions are a cost effective way of adding significant living space.
In addition, basements improve the energy efficiency of homes. Heat losses through basement floors and walls are less than those at ground and upper floor levels. Research carried out by BRE found that given two houses of the same above-ground size and construction, the one with a basement would be 10% more energy efficient. Living space below ground also offers excellent sound insulation, particularly where a suspended concrete floor is used at ground level.
Basement extension excavation

The new basement provides the foundation for a rear extension. The basement extension can be a cost effective solution when deep footings are required.
Basement Extension Specialists
The resurgence in the interest in basements has been fuelled by the self-build market. Self-builders have recognised the extra flexible living and storage space that basements provide and have used them as home offices, guest bedroom suites, utility rooms, gymnasiums and even swimming pools. House builders are now beginning to incorporate basements, not only for the more efficient use of expensive land but also to meet the demands of house buyers for more flexible living space.
A basement provides extra living space and also meets the demands of the Government for higher density and better levels of sustainability.
Biocraft designs and builds basement extensions throughout Berkshire, Oxfordshire, Hampshire and Surrey.
Basement extension design and build
We can offer a full package - design, specification and build or purely a sub contract construction service only. Our structural engineer, architect and building control specialist can prepare plans, arrange for soil and site investigations, and prepare all construction details to ensure that your basement complies with all planning, structural, waterproofing and building regulation requirements.



Biocraft is a member of the British Structural Waterproofing Association (BSWA) and the Structural waterproofing group of the BWPDA. As a basement conversion specialist we can offer 20 year insured guarantees through Guarantee Protection Insurance (GPI) Ltd, which is required for NHBC and Zurich new build home warranties.
We are an approved installer of Isola Platon, and John Newton cavity drainage membrane systems for basement conversions. Biocraft designs its basement conversion solutions in accordance with BS8102, the code of practice for protection of structures against water from the ground.
A properly designed and installed waterproofing system for your basement extension will provide you with significant additional living space and add value to your property.
Click here to see Basement Conversion project on the Blenheim Palace Estate.
Biocraft carries out basement excavation, basement extensions and basement construction throughout Berkshire, Oxfordshire, Surrey, and Hampshire.
If you are thinking of extending your basement or creating a new basement area, please call Biocraft on 0800 781 8358 or email Survey@biocraft.co.uk.
