Building Plan Approval Assistance · Question

What is a commencement certificate in the building approval process?

Short answer

A commencement certificate is the local authority's permission to begin construction on a plot. It usually follows the sanction of the building plan and is issued once conditions such as fee payment and required undertakings are met. Sanctioned drawings say what may be built, while this certificate says that work may now start.

In more detail

Many owners treat the sanctioned plan as the finish line, yet in many places there is one more step before the first foundation trench is dug. The authority approves the design, then separately confirms that the applicant has met the conditions attached to that approval.

Plan sanction compared with commencement permission
Document	What it tells you
Sanctioned plan	The design and use are acceptable subject to conditions
Commencement certificate	Work on site may start under those conditions

Why the gap exists:

Conditions may include payment of charges, submission of the engineer's and architect's appointment details, structural design responsibility, safeguards for neighbouring property and arrangements for site safety. The authority wants these in place before ground is broken, since they are harder to enforce afterwards.

What can go wrong without it:

Starting work before the certificate is issued can lead to a stop-work notice, penalties or difficulty in obtaining later certificates. Lenders and buyers who ask for the construction paperwork may query the gap too. Procedures differ by body, and some combine the two steps, so ask the competent authority how it handles them.

Keep the validity in mind

Permissions are normally issued for a limited period and may need renewal if work does not begin or progress in time. Check the validity stated on your certificate and diarise it.

Keep a copy of the certificate on site and with the project file. Inspectors, lenders and later the occupancy process will all look for it.

Key points

Plan sanction approves the design; commencement permission allows work to begin.
Conditions attached to the approval usually need to be met before the certificate issues.
Early starts can invite notices, penalties and trouble with later certificates.
Some authorities merge the two steps, so confirm local practice.
Note any validity period and renew in time if work is delayed.

Who this applies to

Owners who have received a sanctioned plan and wish to start work.
Contractors asked to mobilise before the paperwork is confirmed.
Lenders and buyers reviewing the construction file of a project.

Last reviewed 3 October 2026

This answer is general information, not advice on your particular case. Terms, eligibility, and requirements change, so check the current position with the relevant institution or authority.