Site inspections

For most domestic new build or extensions a number of inspections will be made as set out below.

It is your or your builder’s responsibility to contact us once the stages listed below are reached to enable an inspection to be carried out. Depending on the project, some of these may the integrated and undertaken at the same time.

Commencement – before you start work (statutory)

Your building control surveyor will carry-out various site inspections depending on the type of the works being undertaken. These inspections are to ensure that the construction is being undertaken in accordance with the building regulations.

It is a statutory requirement that you notify us of commencement of works at least 48 hours before you begin.

This first site inspection is an opportunity for your surveyor to generally discuss the project with the builder, including any conditions that may apply to the application.

Excavations before concrete (statutory)

Allows ground conditions to be checked. Your surveyor will consider all or some of the following:

  • the bearing capacity of the ground
  • proximity and depth of any drains and manholes
  • depth of existing foundation
  • proximity of any trees or recently removed trees
  • whether or not the building is on made up ground

Preparation of oversite – ground floor slab (statutory)

This inspection is to determine the suitability of the hardcore used to ensure it is well compacted and the provision of sand blinding, if required.

Damp proof course (statutory)

The damp proof membrane is checked for thickness, and sufficient overlap between new and existing damp proof courses. Floor insulation may also be inspected at this stage.

Drains – foul and storm (statutory)

All new drainage is inspected before it is covered. The items checked on this inspection include:

  • suitability of material used
  • fall and line of the drain
  • material used for bed and surround
  • access points

Drains test (statutory)

Wherever possible the above and below ground drainage systems are checked for air or water tightness.

Floor joists

The size, grade and the centre of the joists are checked together with the lateral restraint strapping and herringbone strutting.

Roof members

The size, grade and the centre of the timbers/ trusses are checked together with the lateral resistant strapping, herringbone strutting and wind bracing.


We will generally try to inspect the insulation prior to covering to ensure that the correct thickness and type is installed.

Occupation (statutory)

If the building will be occupied before the works are complete, notify your surveyor.

Completion – the final inspection (statutory)

This is the final inspection and checks that all works are complete as well as:

  • ventilation to rooms and roof voids
  • waste details
  • roof coverings
  • fire precautions and requirements
  • safety glazing
  • staircase details
  • commissioning certificate for smoke detection and emergency lighting, where applicable

On the satisfactory completion of the building work a completion certificate will be issued. We would strongly recommend that before you make any final payment to your builder, you ensure that the work has been inspected and approved by your surveyor and that you have a copy of the completion certificate we have issued.

Get in touch

If you have any queries about site inspections, please contact us by completing the following form or call us on the telephone numbers below:

Contact us

Page updated on: 25 June 2019

Building Control Service


Hackney Service Centre
1 Hillman Street
E8 1DY

Opening times

  • Mon to Fri 9am - 5pm (phone calls only)