Taking On a Building: The Plumbing and Heating Questions to Settle Before Completion, Not After
When a building changes hands or moves to a new operator, the mechanical and water-safety compliance does not reset. It transfers. Whatever was unresolved on the day before completion is inherited in full by whoever holds the maintenance and repair obligation the day after, and the gap between the records the vendor produced and the obligations the new dutyholder actually carries is where the first year's unpleasant surprises come from. The due diligence that protects against this is mechanical, not just legal, and it belongs before completion while there is still leverage to price it in.
The following is the plumbing and heating due diligence worth running on any commercial building at acquisition or handover. None of it is exotic. The recurring failure is not that these duties are obscure, but that they are assumed to have been handled by someone, and the assumption is never tested until an enforcement officer, an insurer, or a failed plant item tests it instead.
1. The Legionella risk assessment, and whether it reflects the building as it runs now.
Ask for the current L8 risk assessment, the temperature monitoring records, and the written scheme of control. A risk assessment that exists but is three years old, or predates a change in occupancy or a plant alteration, is not a current one. Confirm who the responsible person was and whether that role transfers cleanly or falls vacant at completion.
2. Gas safety records for every commercial gas appliance.
Ask for the commercial gas safety records, the appliance-by-appliance inventory, and the name and qualifications of the engineer who produced them. Confirm the appliances on site match the records, that the records are current, and that any At Risk or Immediately Dangerous findings have been closed out rather than carried forward. A building with commercial catering or plant gas needs the catering and plant qualifications evidenced, not just a domestic-style certificate.
3. The asbestos register and management plan, and who the duty defaults to.
Under Regulation 4 of the Control of Asbestos Regulations 2012, any non-domestic building — particularly one built before 2000 — must have its asbestos identified, recorded in a register, and managed under a written plan. At a change of ownership or operator, the duty defaults to whoever now holds the maintenance and repair obligation, and that is precisely the point at which it most often falls into a gap. Ask for the register, the management plan, and the most recent re-inspection, and establish where the duty sits the moment the ink dries. Plumbing and heating work disturbs fabric, so this one is not a side issue for a mechanical contractor — it governs whether work can safely proceed at all.
4. Thermostatic mixing valves and the hot water safety regime, in any building with vulnerable users.
In care, healthcare, education, or any setting with vulnerable occupants, ask for the TMV inventory, the specification, and the in-service test records. A fitted valve is not evidence of a working control; the test record is. Confirm the valves are the right specification for the setting and that the hot water system is configured to satisfy both the scald and the Legionella duty rather than compromised between them.
5. Grease management, where there is a commercial kitchen.
Ask for the grease separator or recovery unit, the maintenance log, and the waste transfer documentation for recovered grease and used cooking oil. The device alone proves nothing; the maintenance log is what demonstrates the discharge offence is being actively prevented, and the waste paperwork is what protects the operator under the duty of care. A kitchen that cannot produce the log is a kitchen carrying an unpriced liability.
6. Leak detection, isolation, and the insurance position on escape of water.
Establish whether the building has automatic leak detection and isolation, where the stopcocks and isolation valves are, and whether they are identified and accessible. Confirm with the incoming insurer whether escape-of-water cover carries any condition or excess tied to detection, and whether Trace and Access is included. Escape of water is among the costliest commercial property perils, and the building's exposure is inherited at completion along with everything else.
7. The EPC and MEES position, assessed rather than assumed.
Confirm the EPC rating, its expiry, and whether the building meets the minimum standard it is required to meet. For larger commercial buildings, the confirmed trajectory toward EPC B from 2031 for premises over 1,000 square metres — where cost-effective, subject to the seven-year payback test and secondary legislation — turns a marginal rating into a future cost, not just a present one. Where any exemption is claimed, including on a listed building, confirm it is evidenced and registered, not assumed.
8. Plant age, redundancy, and the replacement liability sitting in the plant room.
Establish the age and condition of the boilers, calorifiers, pumps and controls, whether the plant has any redundancy, and where it sits in its life. A single boiler with no standby, at the end of its life, in a building completing in autumn, is a cost the new owner will likely meet that winter. This is the difference between a plant room that was surveyed before completion and one that was assumed to be fine because it was warm on the day of the viewing.
For asset managers, incoming FM teams, and portfolio landlords, the value of running this list before completion rather than after is that every item it surfaces is still, at that point, a negotiating position. After completion, each one is simply a cost. The building's mechanical compliance transfers whole on the day of completion. The question is whether it has been read first.
Pleasant Plumbers' commercial team carries out pre-acquisition and handover plumbing and heating surveys across London portfolios — Legionella, gas, water safety, drainage, leak risk and plant condition in a single assessment. To commission a survey before completion, call or WhatsApp 0800 046 1000, or email [email protected].
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