It is very important to us that we provide our customers with sound advice on the most appropriate construction method to reflect site conditions, based on our extensive local knowledge, past experience, and what a building inspector may consider ‘best practice’ although companies are under no obligation to do so where a conservatory is deemed to be exempt from building regulations particularly as this may increase costs and effect the competitiveness of their quote significantly.


On projects where building control does apply it is often our practice to exceed the minimum requirements because it is the right thing to do.


Excavate trench up to 2m deep (min 1m)

Bridge pipes & fill with concrete

Lay oversite brickwork to DPC

Lay hardcore min. 100mm

Lay blinding screed of sand

Lay damp proof membrane over up to 100mm insulation

Lay min. 100mm concrete to take 50mm cement floor screed

Cavity wall construction with up to 100mm of insulation

Where the ground drops away more than 450mm from the DPC the floor is normally suspended with a void below.

Traditionally this was achieved using timber joists & floorboards, which although the lower cost option does not meet modern standards of energy efficiency and current construction standards We therefore would always advocate the block & beam method to form the floor when site conditions require it.


The Exemption Rules

Must be built at ground level

At least 75% of the roof must be constructed in a translucent material (glass or polycarbonate) not tiled or solid.

At least 50% of the wall area that will form the external boundary or edge of the conservatory must be glazed with the exception of a designated fire wall.

The buildings footprint must not exceed 30m² in area.

A permanent physical barrier must be maintained between the conservatory and dwelling (exterior quality doors/windows).

Heating must be independent of the dwelling e.g. central heating radiators must not be installed within the conservatory.

Glazing and the electrical installation must comply with IEE and building regulations.