MPBA Pre-Delivery Inspection (PDI)
Mandatory quality and safety inspection for modular and portable buildings before client handover.
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Official MPBA Pre-Delivery Inspection Certification – quality and compliance for modular buildings.
Quality Assurance Certification
The MPBA Pre-Delivery Inspection (PDI) is a structured quality and safety check carried out before modular or portable buildings are delivered to site. It helps ensure every unit meets agreed specifications, MPBA standards and relevant UK building and safety requirements before client handover.
Inspection scheduling support: typically 2–5 working days.
PDI Checklist (Typical Items)
- Exterior inspection for damage, finishing quality and weatherproofing.
- Doors, windows and locks tested for correct operation and sealing.
- Electrical distribution, lighting and sockets functionally tested.
- Plumbing, drainage, sanitary ware and water supply checked.
- HVAC and ventilation system performance verified where applicable.
- Life-safety systems checked – alarms, emergency lighting, fire safety provisions and exits.
- Interior finishes, flooring, ceilings, fittings and fixtures inspected for defects.
- Final sign-off that the unit complies with MPBA and project-specific standards.
Required Documentation
- Project specifications and approved building drawings.
- Installation manuals and relevant manufacturer documentation.
- Health & Safety documentation and risk assessments (where applicable).
- Manufacturer’s warranty and product data sheets.
- Any existing building or compliance certificates relevant to the unit.
Inspection Process
- Book a PDI slot online or via your modular building supplier using your project details.
- Provide building specifications, drawings and key documentation before the visit.
- A certified inspector carries out a full factory or site-based inspection of the unit.
- Any defects or non-compliances are recorded and a rectification list is issued.
- The manufacturer or supplier corrects highlighted issues before final delivery.
- Once complete, a PDI Certificate is issued for client assurance and records.
- The certificate is valid for that specific unit and delivery/installation process.
Inspection Benefits
Quality Assurance
Helps ensure modular units comply with MPBA guidance and UK standards.
Issue Prevention
Reduces risk of defects, delays and client complaints during installation.
Client Confidence
Provides clear evidence that the building has been independently inspected.
Better Performance
Supports long-term durability, safety and usability of modular buildings.
Frequently Asked Questions
While requirements can vary by client and contract, a PDI is strongly recommended and is often treated as mandatory in modular and portable building projects to confirm quality and safety before delivery to site.
Most inspections take between 1–3 hours, depending on the size, complexity and specification of the modular unit or building being assessed.
Inspections are usually carried out by certified MPBA inspectors or accredited engineers with experience in modular construction and compliance requirements.
Yes. Any issues identified during the PDI should be rectified by the manufacturer or supplier. A follow-up or re-inspection may be arranged before the final PDI certificate is issued.
The MPBA PDI certificate is project- and unit-specific and is generally valid for the delivery and installation period of that modular or portable building. New projects or units will usually require a separate PDI.