Building Control Inspections: What to Expect at Each Stage

Building Control is the statutory process that ensures building work complies with the Building Regulations. Whether you use the Local Authority Building Control (LABC) or an Approved Inspector (private Building Control), a series of inspections takes place at key stages of the project.

What Building Control Covers

Building Regulations set minimum standards for:

• Part A: Structure
• Part B: Fire safety
• Part C: Site preparation and resistance to moisture
• Part D: Toxic substances
• Part E: Resistance to sound
• Part F: Ventilation
• Part G: Sanitation, hot water, water efficiency
• Part H: Drainage and waste disposal
• Part J: Combustion appliances
• Part K: Protection from falling, collision, and impact
• Part L: Conservation of fuel and power
• Part M: Access to and use of buildings
• Part O: Overheating
• Part P: Electrical safety

The Typical Inspection Sequence

Commencement notice: Before any work starts, you or your contractor must notify Building Control. This triggers the inspection process.

Foundations (prior to concrete pour): The Building Control Officer (BCO) inspects the excavated foundations before concrete is poured. This confirms foundation depth, width, and ground bearing conditions. Do not pour concrete before this inspection.

Damp-proof course (DPC): Where a new floor or wall construction is being built, the BCO inspects the DPC level before it is covered.

Structural elements (pre-cover): Steel beams, temporary propping, new joist structures, and other structural elements should be inspected before they are hidden behind plasterboard or finishes.

Drains (pre-cover): New drainage must be inspected and tested before backfilling. A water test (or pressure test) confirms the drainage is watertight.

Insulation (pre-plaster): Wall and roof insulation is inspected before plastering covers it.

Electrical first fix: The electrical first fix (cable routes, back boxes) is typically inspected at the first-fix stage or self-certified by a Part P registered electrician.

Final inspection: On practical completion, the BCO conducts a final inspection covering all visible elements — fire doors, ventilation, means of escape, smoke alarms, staircase, and finishes compliance. A Completion Certificate is issued if all is satisfactory.

How to Book Inspections

Notify Building Control 24–48 hours before each stage. Most LABC and Approved Inspector services have online notification portals. Keep a record of notification confirmations — these protect you if a dispute arises later.

The Completion Certificate

The Completion Certificate confirms that Building Control has inspected the work and is satisfied it complies with Building Regulations. This is an important document for:

• Demonstrating compliance to future buyers
• Insurance purposes
• Sign-off for mortgage retention releases

If Building Control cannot issue a Completion Certificate (because works were completed without inspection), a regularisation application may be required.

RCB Design & Build

RCB Design & Build coordinates Building Control throughout the project — making commencement notices, booking inspections at the right stages, and ensuring the project achieves a Completion Certificate.