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Keeping the Builder Building

Inspection Chambers



Picking the right inspection chamber for your project

A handy guide of things you need to know before deciding on an inspection chamber, and choosing the right one for your project.

An inspection chamber is needed any time the pipework changes direction with an angle of more than 30dg, if there’s a change in pipe size, or if two pipes come together at a junction of more than 45dg. These should be accessible through an inspection chamber.

Inspection chambers are an integral part of an underground drainage system. They allow the system to be inspected and cleaned as crucially every point in a drainage system should be accessible for maintenance. This might seem a little over cautious but if there is ever a problem within the system you’ll be grateful you can quickly identify the problem and are able to get to it to fix it!

You would also need to use and inspection chamber commercially if there is a straight run of piping which is over 22 metres long.

On-site, if there is a change in the gradient of the land, you would need inspection chambers at the start and endpoint where the gradient changes.

Further from this, they are also used for safety purposes as they prevent people from entering a drainage system without permission as they can be extremely dangerous.


Before looking into choosing the right inspection chamber you need to know:

  • The size of the pipe
  • The type of pipe you have
  • Cover level/invert level or depth
  • Configuration
  • Depth is a crucial factor in determining which inspection chamber you should use.

An inspection chamber with a width of 300mm or less can only be installed at a depth of 0.6m (600mm) making these chambers perfect for using near your house as you’re not going to need a person to go in and maintain this- making thee non-man entry.

Chambers with a width of up to 450mm can be installed at a depth of 1.2m (1200mm). These are easily accessible for cleaning however are large enough for a small child to fall into so you cannot install these above 1.2m.

Showing all 16 results

300x300x80 SQUARE TO ROUND PAVIOR TRAY C/W INTEGRAL KEYS

£59.10 excl VAT Add to basket

315MM SQUARE PEDESTRIAN DUTY, SEALED COVER & FRAME. 1.5TON

£35.99 excl VAT Add to basket

450MM CAST IRON ROUND COVER WITH FRAME – 12.5TON

£48.73 excl VAT Add to basket

450MM DIA. BRETT MARTIN 160MM INSPECTION CHAMBER BASE (2X110 INLETS)

£56.86 excl VAT Add to basket

450MM DIA. BRETT MARTIN CHAMBER RISER. HEIGHT 300MM (EXCLUDING SEAL)

£29.21 excl VAT Add to basket

450MM DIA. CHAMELEON ROUND RECESSED MANHOLE COVER/TRAY, INC. 2 KEYS

£23.43 excl VAT Read more

450MM POLYPROPYLENE ROUND COVER & FRAME – 3.5T

£41.37 excl VAT Add to basket

450x450MM 3.5T SQUARE-TO-ROUND POLYPROPYLENE MANHOLE COVER

£49.59 excl VAT Add to basket

450x450MM B125 DUCTILE IRON MANHOLE COVER 12 TONNE

£80.81 excl VAT Add to basket

450x450x80 SQ TO RND PAVIOR TRAY C/W INTEGRAL KEYS

£67.90 excl VAT Add to basket

600x450MM 5 TON GALV MANHOLE COVER W/PLASTIC FRAME

£46.99 excl VAT Add to basket

600x450MM B125 DUCTILE IRON MANHOLE COVER, 12 TONNE

£89.34 excl VAT Add to basket

600x450x46MM (INTERNAL DEPTH) RECESSED INTERNAL SCREED TRAY INC. RUBBER SEAL & LOCKING SCREWS, 5 TON

£51.45 excl VAT Add to basket

600x450x80MM STD PAVIOR TRAY C/W INTEGRAL KEYS

£60.72 excl VAT Add to basket

600x600MM B125 DUCTILE IRON MANHOLE COVER, 12 TONNE

£128.81 excl VAT Add to basket

GALV MANHOLE LIFTING KEYS, PAIR, 12″

£18.00 excl VAT Add to basket