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Frequently Asked Questions about our products and services we offer



Part A - Structure

Part A - Structure

This information is contained in the guidance document published by the Timber Research and Development Association (TRADA) titled: – ‘Span tables for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings’, obtainable from:

TRADA Technology Ltd,
Chiltern House
Stocking Lane
Hughenden Valley
High Wycombe
HP14 4ND

Or alternatively technical guidance is given in British Standard BS 8103 Part 3 2009 ‘Structural design of low-rise buildings – Code of practice for timber floors and roofs for housing’, obtainable from:

British Standards Institution
389 Chiswick High Road
W4 4AL

Category: Part A - Structure

Basements require both Planning Permission and Building Regulations approval whether constructed as part of a new property or as a retrofit to an existing property. You will need to consult your Local Authority Planning and Building Control offices
The Basement Information Centre publishes a useful industry guide ‘Basements for dwellings’ on basement design and construction and they can be contacted at the following address:
The Basement Information Centre
Riverside House
4. Meadows Business Park
Station Approach
GU17 9AB

Category: Part A - Structure

It is possible to build a conservatory on top of an extension provided: -Local Authority Planning Permission has been granted – Local Authority Building Control are content with respect to all the relevant parts of the Building Regulations. Conservatories at first-floor level are not exempt from the Building Regulations.

Category: Part A - Structure

Part B - Fire Safety

Part C - Site preparation and resistance to contaminates and moisture

Part E - Resistance to the passage of sound

Part G - Sanitation, hot water safety and water efficiency

Part M - Access to and use of buildings