What Commercial HVAC Costs in the UK

Why per-square-metre pricing does not work

The most common opening question is some version of "what does commercial HVAC cost per square metre?" It is a fair question and there is no honest number to give, because floor area is a weak predictor of what a building needs.

Cooling and heating loads come from occupancy, lighting, equipment, solar gain and fresh-air requirements — and those vary enormously between buildings of identical size. A 400 m² open-plan office with 40 staff and a south-facing glazed elevation has several times the cooling load of a 400 m² warehouse with six staff and no windows. Any figure that averages across both is wrong for both.

What a per-m² figure can do is sanity-check a budget you already have. What it cannot do is size a system or produce a comparable quote. That requires a load calculation — see commercial air conditioning for how one is done.

What actually moves a commercial HVAC quote

Two bids for the same building can differ by a factor of two without either being unreasonable. Almost all of the difference sits in these variables rather than in the plant.

• Access and craneage. Ground-level plant versus a rooftop lift needing a crane, a permit and possibly a road closure. This alone can be a five-figure swing on an otherwise identical system.
• Electrical capacity. If the incoming supply has headroom, this is a modest cost. If it does not, you are into a Distribution Network Operator upgrade with its own price and a lead time measured in months.
• Pipe, duct and cable routes. Long or awkward runs through an occupied building add labour, containment and making good.
• Builder's work. Penetrations, fire stopping, structural support, decoration. Frequently excluded from the headline figure and then added later.
• Out-of-hours working. Standard in retail and hospitality, and it carries a real premium.
• Acoustic mitigation. Where a BS 4142 assessment requires attenuation or an acoustic housing, particularly near residential neighbours.
• Controls and BMS integration. Often the difference between a system that performs and one that merely works — and often the first thing cut.

This is why the cheapest quote is frequently not comparable rather than genuinely cheaper. The single most useful question you can ask every bidder is what heat load they designed to and how they calculated it. On a multi-zone building the answers diverge far more than the prices do, and that divergence is what you are actually choosing between.

The HVAC cost ladder

Most cost pages quote one wide range per system and leave you to guess what is inside it. This ladder does the opposite: each rung carries a price that someone published, what that price includes, and a date. Read down it from the smallest rung to the largest and the point where the pricing stops being a number and becomes a design is easy to see.

The installed prices for splits, cassettes, VRF and maintenance come from one UK trade pricing guide (Trade2Base, HVAC contractor pricing guide 2026, dated 27 May 2026). It is a contractor-software company's guide, not a survey of quotes, so treat the figures as a benchmark to test a quote against rather than a quote. The chiller and air handling unit rows are equipment-only list prices read on UK seller pages on 30 September 2026; the tables behind them are on the chiller cost guide and the AHU cost guide. Nothing above a small chiller or a compact heat-recovery unit has a published installed range worth quoting: those jobs are priced from a design, and a number given before one exists is a guess.

A worked comparison: 40 kW of cooling

The arithmetic below uses only the published figures above and is not a quote. It shows why the answer to "which system is cheapest?" depends on the scope you are comparing.

• Eight 5 kW wall splits: 8 × £1,500–£2,200 = £12,000–£17,600 installed, with eight outdoor units to site and eight sets of pipework.
• One 40 kW VRF system: 40 × £400–£700 = £16,000–£28,000 installed, with one outdoor module, central controls and the option of heat recovery between zones.
• An air-cooled chiller: the 32 kW and 50 kW models on the chiller cost guide list at £7,939 and £11,781 ex VAT as equipment only. The installed figure for chilled water adds pumps, pipework, terminal units, controls and plant-room work, so it cannot be read off a list price.

Splits win on simplicity and price below about five indoor units; VRF takes over when zones multiply; chilled water is chosen for large or refrigerant-sensitive buildings, where the machine is a minority of the total. The decision turns on the building's load, not on the cheapest rung, which is why the question to put to every bidder is what heat load they designed to.

What a maintenance contract adds

On the same guide's figures a ten-indoor-unit split or cassette site costs £1,800–£3,500 a year to maintain (two visits, labour and minor consumables, major parts extra); AHU servicing is quoted at £350–£600 per engineer per day. Over five years that is £9,000–£17,500 for ten units, which belongs in any lifetime comparison of one system against another. Maintenance is also what keeps manufacturer warranties valid and discharges the F-Gas leak-check duty: see maintenance and PPM.

Sources and last checked

• Trade2Base, HVAC contractor pricing guide: how to price air conditioning and ventilation work in the UK (2026), dated 27 May 2026: wall splits, cassettes, VRF per kW, PPM per indoor unit, AHU servicing day rate.
• UK seller list prices ex VAT, read 30 September 2026: chillers (Orion Air Sales, ABC Direct) and heat-recovery units (Orion Air Sales, L&B Fans, NFAN, Just Fans); full tables with links on the chiller and AHU cost guides.
• Last checked 18 October 2026. If a figure here has moved, the seller page or guide named above is the authority.

Cost by system type

Split and multi-split systems

Roughly £1,500–£2,600 installed for a wall unit and £2,500–£4,000 for a ceiling cassette serving a shop or small office; a multi-split serving a small suite is priced as the indoor units plus the shared outdoor-unit and pipework costs. Simple, competitive, and the right answer below about five indoor units. Detail on the air conditioning cost page.

VRF and VRV

Published at £400–£700 per kW installed (a 40 kW floor is £16,000–£28,000), driven by zone count, whether heat recovery is specified, and builder's work. Three-pipe heat-recovery systems cost more up front and pay it back where the building genuinely has simultaneous heating and cooling demand. See VRF and VRV systems.

Chilled water

Published equipment-only list prices for small air-cooled chillers run from £2,349 (5 kW) to £13,520 (63 kW) ex VAT; a complete chilled-water system adds pumps, pipework, terminal units, controls and plant-room work and is priced from a design. The machine is often a minority of the total once pumps, pipework, terminal units, controls and plant-room work are counted. See the chiller cost guide.

Air handling units

Published equipment-only prices for compact heat-recovery units run from about £2,000 to £14,000 ex VAT; larger and specialist units are priced from a design — with construction specification (a pool or laboratory AHU is a different machine from an office one) mattering as much as duty. See the AHU cost guide.

Commercial heat pumps

Highly dependent on whether the building's emitters and electrical supply suit them. The comparison against a gas replacement has to be run on your actual tariffs rather than on generic claims — see commercial heat pumps and the heat pump versus gas boiler guide.

The costs that are not in the capital number

A capital figure alone will mislead you on a system that runs for fifteen to twenty years.

Energy is normally the largest lifetime cost. Seasonal efficiency — SEER for cooling, SCOP for heating, under BS EN 14825 — and part-load behaviour matter far more than headline rated output, because commercial plant spends most of its life at part load. A cheaper system with worse part-load performance frequently costs more over five years.

Maintenance is published at £180–£350 per indoor unit per year for split and cassette systems (two visits, labour and minor consumables; major parts extra), and larger sites with AHUs or BMS integration are priced on a survey. It is not optional: manufacturer warranties are routinely conditional on documented planned maintenance. See maintenance and PPM.

Compliance carries its own cost — F-Gas leak checking at intervals set by refrigerant charge, and a TM44 inspection every five years where air conditioning exceeds 12 kW effective rated output. See servicing and TM44.

Refrigerant is a rising cost that rarely appears in a business case. The HFC phase-down makes high-GWP gases progressively more expensive, so a system charged with an obsolescent refrigerant carries a higher lifetime cost than its purchase price implies. Lower-GWP refrigerants can also place a system in a less frequent leak-checking band for the same physical charge — a genuine ongoing saving. See replacement.

How it gets funded

The £7,500 Boiler Upgrade Scheme is a flat grant towards air-source and ground-source heat pumps up to 45 kWth in homes and non-domestic buildings in England and Wales; it does not fund VRF, chillers or air handling units — commercial HVAC is funded through the tax system rather than through grants, which surprises people who have read about domestic schemes.

The relevant routes are the capital-allowance ones for plant and machinery, set out on our grants and funding page. One distinction worth knowing because it causes confusion: heating, ventilation and air-cooling plant is usually special-rate, as solar PV is, so general advice about full expensing, which covers main-rate plant only, does not transfer to either; the Annual Investment Allowance is the route that carries most of the relief. Confirm treatment with your accountant and against current GOV.UK guidance, since rates and schemes change.

Our funding guide works through the options in more detail.

Getting a number for your building

For a first-pass figure without talking to anyone, the cost estimator will give you an indicative range. For anything you intend to budget against, you need a survey and a load calculation — and you should expect any credible bidder to want one before quoting.

When you do compare quotes, compare on: the design load and how it was derived, what builder's work is included or excluded, whether commissioning is a priced deliverable with measured records, what the controls scope covers, and what the maintenance obligation is to keep the warranty valid.

Guides on this topic

• Building management systems for HVAC: what they do and what drives the cost
• How to compare commercial HVAC quotes

Frequently asked questions

How much does commercial HVAC cost per square metre?

There is no reliable per-square-metre figure. Load comes from occupancy, lighting, equipment and solar gain, which vary enormously between buildings of the same floor area — a busy glazed office and a sparsely-occupied warehouse of identical size have completely different requirements. A per-m² figure can sanity-check a budget but cannot size a system or produce a comparable quote.

Why are our two quotes so far apart?

Usually because they are not quoting the same thing. Differences in assumed heat load, in what builder's work is included, in whether commissioning and controls are properly scoped, and in access and electrical assumptions can easily double a price. Ask each bidder what heat load they designed to and how they calculated it — the answers normally diverge more than the prices.

Is there a grant for commercial HVAC?

The £7,500 Boiler Upgrade Scheme is a flat grant towards air-source and ground-source heat pumps up to 45 kWth in homes and non-domestic buildings in England and Wales; it does not fund VRF, chillers or air handling units. Commercial HVAC is funded through the tax system via capital allowances on plant and machinery rather than through grants. Confirm the current position with your accountant and on GOV.UK, since schemes and rates change.

What is the biggest hidden cost in a commercial HVAC project?

Electrical capacity is the one that most often surprises people. If the incoming supply lacks headroom for the new plant, a Distribution Network Operator upgrade adds both cost and a lead time measured in months. It should be checked at design stage rather than discovered close to commissioning.

Detailed cost guides: air conditioning, air handling units and chillers. See also funding and capital allowances, the cost estimator, and the full system range. Or request a quote.