What annual new-build servicing actually costs

Short answer: for a typical central-London luxury new-build flat with one mechanical ventilation heat-recovery (MVHR) unit and three ducted air-conditioning fan-coil units, an annual planned servicing visit lands in the £300 to £400 inc VAT range. That figure covers the actual engineer time on site, filter replacements, F-Gas leak-check certification on every refrigerant circuit, and a written report. It is illustrative, not a published Harvey W James rate. What it buys, and why the alternative of waiting for something to fail is materially more expensive, is the rest of this post.

The compliance footprint of a luxury new-build flat

Every central-London luxury new-build flat carries a quiet stack of mechanical services that a generic letting agent rarely thinks about until something fails. The standard fit-out for a one- to three-bedroom flat in a recent development typically includes a single Nuaire-class MVHR unit in the utility cupboard, two or three Mitsubishi-class ducted fan-coil air-conditioning units behind the ceiling void, a heat-interface unit drawing from the building's central plant, and the comfort-cooling pipework that joins it all together.

Each of these is a serviceable asset with a manufacturer-recommended cadence and, in the case of the air-conditioning circuit, a statutory leak-check duty under the F-Gas Regulations. Skip the annual visit and three things go wrong in sequence: filters clog and air quality degrades, refrigerant inefficiency increases the energy draw, and — when something eventually does fail — the manufacturer's warranty position is harder to defend because routine maintenance was not evidenced.

This sits inside a broader compliance regime that includes annual gas safety where gas is present, annual electrical condition where required, annual fire-door inspection in multi-occupied buildings, and the new Awaab's Law hazard timescales coming in from October 2027. The MVHR plus A/C servicing visit is one of the more straightforward items on that calendar, but it is the one most likely to be quietly skipped on a generic management contract — which is why Harvey W James writes it into the annual plan for every luxury new-build flat we manage.

What an annual MVHR service actually does

The mechanical heat-recovery unit is the lung of a modern new-build flat. It pulls stale, humid air out of the wet rooms (kitchen, bathroom, en-suite, utility), extracts the heat from that outgoing air via a counter-flow heat exchanger, and uses the recovered heat to warm fresh supply air drawn in from outside before it is delivered to the bedrooms and living room. When it is working properly the flat ventilates continuously with minimal heat loss; when it stops working the flat develops condensation problems, mould risk on cold-bridge surfaces, and the supply-air registers start collecting visible dust.

An annual MVHR service for a single unit covers seven specific things:

Replacing the supply and extract filters (the most common failure mode is simply that the filter loads up and the unit starves itself of airflow).
Cleaning the heat exchanger core and the coils.
Cleaning the internal and external casings.
Cleaning the supply and extract grilles inside the apartment.
Checking the supply and extract fan motors and assemblies for vibration or bearing wear.
Checking the control board and any wall-mounted controller for fault codes.
Producing a written report with photographs and any recommendations.

In an illustrative central-London worked example, this scope on a single MVHR unit was quoted at £230 plus VAT, or £276 inc VAT. The figure is what we have seen for a specialist contractor with the right credentials; cheaper quotes typically come from generic HVAC operators who do not produce the written report or do not actually replace the filters every visit.

What an annual A/C service actually does — and the F-Gas leg

The air-conditioning service is materially more involved because it spans both a mechanical check and a statutory F-Gas leak-check duty. A typical luxury new-build flat carries between two and four ducted fan-coil units, each one served by a VRF refrigerant circuit shared with the rest of the floor or building. The annual visit on each unit covers thirteen items: cleaning of filters and coils; testing of the fan assembly; testing of electrical components including the PCB; testing of the condensate pipework and pump; checking the controller for error codes and filter indications; cleaning of bar grilles where present; checking unit performance against cooling setpoints; cleaning of external condenser casings and coils; checking pipework, insulation, cabling and equipment mountings; checking the compressor, fans and electrical terminals; checking refrigerant circuits for leaks and issuing F-Gas certification; noting any items needing follow-up with an estimated repair cost; and producing a written report for the landlord's records.

In the same illustrative worked example, this scope on three fan-coil units was quoted at £90 plus VAT, or £108 inc VAT — markedly cheaper than the MVHR component because the marginal cost of an engineer already on site to check the refrigerant circuit is low. Bundling the MVHR and A/C into a single mobilisation is why the all-in figure compresses to around £320 plus VAT, or £384 inc VAT, rather than the sum of the two services run separately.

The F-Gas leg is the part that most generic agents do not understand. Under the F-Gas Regulation, anyone working on refrigerant circuits must hold the appropriate qualification — typically City and Guilds 2079, or equivalent — and the company must be REFCOM F-Gas registered. The annual leak check on each circuit produces a certificate that lives with the asset for the life of the equipment. If the certificate is missing, the landlord is the one carrying the regulatory risk, not the contractor.

Worked example one — a 3-FCU plus 1-MVHR central-London flat

Take a flat in a riverside central-London development with the typical luxury new-build fit-out: one Nuaire MVHR unit in the utility cupboard, three Mitsubishi-class ducted fan-coil units serving the bedrooms and the open-plan living and kitchen area, all on a VRF refrigerant circuit. The annual servicing quote from a specialist contractor for this fit-out, anonymised but taken directly from a real HWJ-managed flat, broke down as follows.

The MVHR component covered the seven-step scope described above on a single Nuaire-class unit, priced at £230 plus VAT. The air-conditioning component covered the thirteen-step scope on three ducted fan-coil units, including F-Gas leak-check certification on each refrigerant circuit, priced at £90 plus VAT. The total bundled quote came to £320 plus VAT, or £384 inc VAT, for one comprehensive service visit per annum. That figure is illustrative — Harvey W James does not publish a fixed rate because the variables (unit count, manufacturer, refrigerant type, plant access) change the figure on every flat — but it is broadly representative of what a properly-credentialed contractor charges for this scope in central London in 2026.

What sits alongside the visit, in the planned preventative maintenance contract that the quote rolls into, is a priority call-out clause. If something fails between annual visits the contract holder pays £230 plus VAT for the first hour on site and £45 plus VAT per half hour after that, in standard working hours. Out-of-hours rates run at £345 plus VAT first hour and £67.50 plus VAT per half hour. We will come back to those numbers in the contract-versus-ad-hoc section below.

What the engineer actually records on the day

The contract scope reads cleanly on paper. What it looks like on the day is more useful for understanding what you are paying for. From the same worked example, on the actual service visit:

The MVHR unit (a Nuaire MRXBOX-AB ECO2, asset barcode-tagged for the building's facilities register) had its filter condition graded "C – Poor" prior to service, indicating the filters were near the end of their useful life and were due for replacement regardless of the calendar. Filters were replaced. The filter-clean symbol on the remote was reset. Fan motors and fan assemblies were checked. Grilles were cleaned. Electrical components were checked. The heat exchanger and coils were cleaned. Controls were checked. The unit passed. None of this would have happened if the visit had been skipped.

The three fan-coil units (Mitsubishi Electric PEFY models, one in each of two bedrooms and one in a panel above the kitchen, all on a VRF circuit) each had their filters graded "C – Poor" prior to service, were cleaned, had condensate drains tested, coils cleaned, electrical components checked and terminals tightened, controllers checked. On each unit the supply air temperature was recorded — between 9.4°C and 10.2°C — against a return air temperature of between 21.4°C and 22°C. That is a delta-T of roughly 12°C, which is what a properly-charged refrigerant circuit should deliver. If the delta-T had been compressed (say 6°C to 8°C), that would have been an early warning of a partial refrigerant loss or a fouled coil and would have triggered a follow-up call. F-Gas leak checks were carried out and PASSED on every circuit.

The visit ended with a written report, customer sign-off on a job card, and technician sign-off against the engineer's REFCOM number. The whole record is held against the asset register for the building, which is what underpins any future warranty claim, deposit-claim recovery, or building-safety case.

Worked example two — a smaller 2-FCU plus 1-MVHR flat

For comparison, a second anonymised central-London luxury flat with a slightly smaller mechanical footprint — two ducted fan-coil units and one MVHR unit — was quoted for annual servicing at £300 plus VAT, or £360 inc VAT all in. The scope was the same in kind (seven-step MVHR, thirteen-step A/C, F-Gas certification on every refrigerant circuit, written report) but with one fewer fan-coil unit in the air-conditioning scope.

The £300-to-£320 plus VAT band is therefore broadly representative of the typical central-London luxury one- to three-bedroom new-build flat. Larger flats with four-plus fan-coil units, separate plant for studies or media rooms, or under-floor heating ventilation will sit higher; smaller studios with a single MVHR and no A/C will sit materially lower. The figures should never be quoted as Harvey W James's rate. They are the going market for the actual specialist work, and they are useful as a sense-check against any quote a landlord is considering accepting.

PPM contract versus ad-hoc call-out — the cost case

A planned preventative maintenance contract is not just a way of buying an annual visit. It is a way of buying a priority call-out queue position and a reduced call-out rate against the same engineer pool that would otherwise be servicing other clients first. The economic case is straightforward once you compare the two scenarios.

A landlord on a PPM contract pays roughly £320 plus VAT per flat per year for the annual visit, and £230 plus VAT first hour plus £45 plus VAT per half hour thereafter for any reactive call-out — and that call-out is prioritised over non-contract customers. A landlord without a contract pays nothing for the planned visit (which they have skipped), but when something does fail, they pay the same per-hour rate on a queue behind every contract customer, with no guarantee of same-day attendance, and the manufacturer's warranty position is harder to defend. Out-of-hours emergency call-outs run at £345 plus VAT first hour plus £67.50 plus VAT per half hour — a single weekend air-conditioning failure on a void unit, fixed in three hours, costs roughly £547.50 plus VAT (£657 inc VAT) on the OOH rate. That single emergency, on its own, costs more than two years of the PPM contract.

There is a softer economic case alongside the hard one. PPM customers' engineers know the building. They have the asset register, the access codes, the right ladder for the plant cupboard, the right refrigerant on the van for that VRF circuit. A non-contract call-out is often a first-time visit with the engineer working out the layout on the customer's clock. The contract is not just an insurance premium. It is a way of buying institutional memory of the flat.

What "specialist contractor" actually means

Pillar 4 of /new-build-specialists says the annual servicing regime is what separates specialist luxury management from generic letting. The thing that actually makes a contractor "specialist" in this context is a small stack of credentials that the contractor either has or does not have. They are worth naming.

A specialist HVAC and ventilation contractor in the central-London luxury new-build space typically holds: REFCOM F-Gas company registration (the company-level licence to handle refrigerants); Environment Agency registration; CHAS compliance (the construction-industry health and safety pre-qualification); engineers qualified to City and Guilds 2079 minimum, with the corresponding personal F-Gas card; £5 million Public Liability insurance as a floor; and asset-register software that produces a job card, an F-Gas certificate and a written report against a barcode-tagged unit. The contractor used in both worked examples above holds all of these. A generic HVAC operator may hold some but not all, and the gap typically surfaces only when a warranty claim is contested or a deposit-claim adjudication asks for the F-Gas certificate that was never issued.

Harvey W James does not employ HVAC engineers in-house. We instruct a small network of specialist contractors with these credentials for the luxury new-build flats we manage, and we keep the resulting paperwork in the same asset register as the gas safety certificates, electrical condition reports, fire-door inspection records and Awaab's Law hazard log for each flat. That single source of truth is what makes the annual compliance calendar tractable rather than firefighting.

Where this sits in the wider compliance calendar

The MVHR plus A/C annual visit is one line on the compliance calendar for a luxury new-build flat. The full calendar typically also includes: annual gas safety (where gas is present in the flat or the building); annual electrical installation condition where the regulations require; annual heat-interface unit servicing where the building has a central plant feeding the flat; bi-annual or annual flat-front-door fire-door inspections under the Fire Safety (England) Regulations 2022 (annual for buildings under 11 metres, quarterly for over 11 metres); five-yearly electrical installation condition reports; smoke and CO alarm checks at every tenancy change; and the Awaab's Law hazard response timescales coming in from October 2027 under Renters' Rights Act section 92.

The annual MVHR plus A/C visit is the item that most often slips, because there is no headline statute that mandates it directly. It is mandated instead by the manufacturer's warranty position, the F-Gas Regulation on the refrigerant circuits, and the landlord's repair covenant under section 11 of the Landlord and Tenant Act 1985. Generic agents tend to skip what is not on the obvious gas-and-electrical headline list. Specialist agents put it on the same recurring calendar as everything else and book it before the prior year's certificate expires.

Where to look next

This post is the worked-example anchor for Pillar 4 of our New Build service framing. The other posts in the series sit alongside it as the rest of the picture:

What's distinct about new-build lettings in London — the New Build series anchor post.
How utility management works on a London new-build — communal heating, prepayment meters, and the Bills Included trade-off.
The line between developer snagging and agent maintenance — developer warranty boundary and the specialist contractor network.
New build deposit-claim clauses — the tenancy-clause architecture (8.7 to 8.10) that turns documented servicing failures into recoverable deposit claims where appropriate.

For the consolidated service-page framing across all five pillars including Pillar 4 (HIU, MVHR, HVAC, fire-door compliance), see New-Build Specialists. For how this sits inside a Renters' Rights Act tenancy lifecycle, see Landlords — how our 10% fee works. For the wider asset-register and contractor-network operational layer, see Property Management.

Sources

Calibre Precision Climate Control Ltd — Quote 9195 dated 2 May 2025; Planned Preventative Maintenance Contract 9195 covering 1 May 2025 to 30 April 2026; Job Card 6264 dated 14 May 2025; Quote 9567 dated 27 June 2025. All anonymised here. Held in Harvey W James contractor records.
Essential Terms and Charges v2.1.5 (May 2026) §47 [REPAIR-001], §47.5, §47.6, §44, §11.5, §11.6 — the operational terms of the HWJ management offer for luxury new-build flats.
F-Gas Regulation (Regulation (EU) No 517/2014, retained in UK domestic law) — annual leak check on refrigerant circuits and the C&G 2079 / REFCOM credential framework.
Regulatory Reform (Fire Safety) Order 2005; Fire Safety (England) Regulations 2022; Building Safety Act 2022 — fire door inspection cadences and the wider compliance calendar context.
Renters' Rights Act 2025 ss.6, 8, 92 — landlord obligations on possession grounds and Awaab's Law hazard response timescales (in force from October 2027 on regulations to be made).
Landlord and Tenant Act 1985 s.11 — landlord repair covenant for installations including space-heating and air-conditioning.
Public scheme registers used in this article (for Harvey W James's own credentials): Propertymark CMP register, Property Redress Scheme agent finder, ICO Data Protection register.

This article is general information about the operational management of central-London luxury new-build flats and the typical cost shape of an annual servicing visit. The cost figures are illustrative and drawn from anonymised real-world quotes; they are not Harvey W James's published rates. Specific advice for your property should be obtained from a regulated professional. Last reviewed: 23 May 2026, against Essential Terms and Charges v2.1.5.

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