How should air conditioning be planned into your London office refurbishment?
Plan air conditioning before ceilings, partitions and room uses are fixed. The system affects unit positions, pipe routes, controls, access panels and plant space, so late decisions create clashes. In a London office refurbishment, Cat A sets the base services, while Cat B decides how the space actually works.
A fit out programme can look settled on paper long before the cooling has been tested against it. Ceilings have been drawn. Partition lines have been agreed. Meeting rooms have moved twice. Then someone checks whether the air conditioning still serves the final layout, and the answer is less tidy than the programme assumed.
Cat A fit out usually deals with the landlord’s base-build services and creates a lettable space. Cat B fit out turns that space into a working office for a named occupier, with their rooms, people, equipment and working pattern. Cat A+ sits between the two, giving a more finished, ready-to-occupy specification, although it still needs careful checking against the occupier’s use.
Air conditioning sits across those stages because it belongs to the mechanical and electrical services, often called M&E, but it also affects the visible fit out. A ceiling cassette cannot be placed where a partition head will block it. A ducted system needs routes and access. A meeting room needs a control strategy that matches how the room is used.
The useful planning question is therefore simple: does the system match the final office layout, or has it only been allowed for in the technical package?
Cat A provision rarely answers every Cat B need
A Cat A specification may include base-build cooling, but that does not mean it is enough for the Cat B layout. The lease, landlord technical pack and fit out approval documents define what is actually provided, and those documents need reading before the office air conditioning layout is treated as settled.
The pressure point comes when an open-plan design becomes a real workplace. Meeting rooms add heat and need separate control. Comms rooms and server rooms have their own load. Cellular offices change air movement. Higher occupancy density can make a system that looked adequate in Cat A feel blunt in use.
Here is the practical split to check before the programme locks.
| Fit out stage | Typical air conditioning role | What to check |
|---|---|---|
| Cat A fit out | Base-build cooling or allowance for services, depending on the building specification | Capacity, plant routes, landlord controls, ceiling voids and future connection points |
| Cat B fit out | Cooling matched to the occupier’s layout, rooms, equipment and controls | Zoning, meeting rooms, comms room cooling, access panels and controller positions |
| Cat A+ fit out | A more finished office with services already coordinated to a likely layout | Whether the installed arrangement suits your actual headcount, room use and tenancy obligations |
A variable refrigerant flow system, shortened to VRF, uses one outdoor plant arrangement to serve multiple indoor units. That can suit larger offices with several zones, but the design still needs to follow the way the office will be occupied. Manufacturer language may use variable refrigerant volume, or VRV, for a similar type of system, so the practical issue is the same: which areas need independent control, and where can the equipment sit without fighting the ceiling design?
RightAir Solutions often sees the most expensive air conditioning questions appear after the fit out team has already made decisions that look unrelated to cooling. In practice, the partition plan, ceiling plan and control zones need checking together because each one can make the others harder or easier to deliver.
London constraints make plant location an early design item
Plant location drives many London office air conditioning decisions. External condensers, roof plant, riser space, neighbour noise and restricted access can all affect whether a neat design on a drawing is workable on site.
London has not banned office air conditioning, but projects should show that cooling has been considered properly. The London Plan 2021, through Policy SI 4 Managing heat risk, places active cooling last in the cooling hierarchy for major developments, after measures that reduce heat entering the building, cut internal heat gain and use passive or mechanical ventilation. Its principles can also be applied to minor development, so smaller refurbishments still benefit from a sensible cooling strategy.
Permission and approval checks also need clear separation. GOV.UK makes clear that building regulations approval is separate from planning permission, and a fixed air-conditioning system is listed as an alteration project that may need building regulations approval. Local authority building control and planning teams deal with different questions, so assuming one approval covers the other is a poor shortcut.
In West and North West London, the hard parts often sit outside the tenant’s floor plate. A visible condenser may be unacceptable on a frontage. A roof position may raise acoustic questions. A listed building or conservation setting can narrow the available routes. Limited ceiling void space can make a ducted system possible in one area and awkward in another.
A specialist survey turns those constraints into design choices. RightAir Solutions approaches this kind of London office fit out cooling by checking plant position, access and internal routes before the specification hardens, since those items are much harder to fix once ceilings and finishes are being installed.
Check the ceiling plan and partition plan together with the cooling zones. A system that looks sufficient on paper can become awkward once meeting rooms and control positions are fixed.
Handover planning must name control, access and maintenance
An air conditioning system is properly planned only when someone knows who controls it, who maintains it and who holds the records after handover. Lease wording and landlord approval documents matter here, but the aim is practical clarity, not a legal essay.
Responsibility can be split in a multi-let building. A landlord or building manager may control a central system, while an occupier takes responsibility for equipment added for its own floors or rooms. GOV.UK guidance uses that same practical principle for air conditioning inspection responsibility, so the handover pack needs to match how the building is actually run.
Controls deserve the same attention as equipment. A building management system, or BMS, may control base-build services, but a Cat B layout might need local control for meeting rooms, comms rooms or high-density areas. Poor zoning creates complaints even when the plant itself is capable.
Compliance records then sit alongside maintenance planning. Under GOV.UK guidance, air conditioning systems with an effective rated output of more than 12 kW must be inspected by an energy assessor at intervals no more than five years apart. Several smaller units can fall within the same requirement where their combined output is more than 12 kW and they are controlled by a single person. TM44 is the air conditioning inspection method used for this compliance process.
Planned preventative maintenance, shortened to PPM, needs physical access. Filters, drain points and service panels cannot be hidden behind joinery or sealed ceilings without turning routine work into disruption. The handover information should include commissioning records, as-built drawings, asset details, control notes and operations and maintenance manuals, so the next person responsible for the system does not inherit guesswork.
Keep handover records with the fit out package from the start. Commissioning details, as built drawings and maintenance access notes are easier to gather during the project than afterwards.
Coordinated cooling holds up better than a late add-on
The difference shows up at the points nobody notices in a finished presentation pack. A late air conditioning add-on fights for the ceiling space left after lighting, partitions and feature finishes have taken priority. Pipe routes become less direct. Controllers land where they fit, rather than where people use them. Access panels appear as afterthoughts.
A coordinated approach starts with the limits of the building and the real use of the office. Plant routes are tested early. Cooling zones follow room use. Maintenance access is drawn into the fit out. Handover information is prepared as part of the job, rather than gathered at the end under programme pressure.
Long-term, the coordinated route works better because it leaves fewer compromises for the occupier to manage. The system is easier to maintain, easier to explain at handover and more closely matched to the way the office is used. Air conditioning planned into the refurbishment becomes part of the building logic. Air conditioning squeezed in later usually carries the marks of every decision made before it.
Common questions about air conditioning in London office refurbishments
Can a Cat A+ office still need cooling changes?
Yes. Cat A+ can provide a more finished office, but the installed cooling still needs checking against your actual layout, room use and occupancy pattern.
Can a tenant add extra air conditioning for a comms room or server room?
A tenant may be able to add supplementary cooling, subject to the lease, landlord consent, plant space and technical approval. Specialist rooms should be reviewed early because their cooling demand does not match normal office use.
What should an air conditioning handover pack include?
A useful handover pack should include commissioning records, as-built drawings, asset details, control notes and operations and maintenance manuals. Those documents help the occupier, landlord or managing agent run and maintain the system without guessing.
Why do meeting rooms cause air conditioning problems?
Meeting rooms concentrate people and equipment in a smaller enclosed area. If the Cat B layout creates several meeting rooms from an open-plan space, the original cooling zones may no longer match how the office is used.
Does every commercial air conditioning system need a TM44 inspection?
The inspection requirement applies where the effective rated output is more than 12 kW, including combined smaller units controlled by one person. TM44 is the inspection method used for compliance, and maintenance still needs separate planning.
This is general information, not professional advice.
