Fitting air conditioning in a leased commercial unit

The unit hits 30C by two in the afternoon, staff are working in it, customers are cutting visits short, and the obvious answer is air conditioning. Then someone remembers the building is rented, and the question changes from what to buy into what the lease allows.

Most UK shops, salons, cafes and small offices sit in leased premises. The good news is that fitted cooling in a rented unit is routine. The mistake is treating it as a purchase decision when the first three weeks are a paperwork decision.

Start with the alterations clause

Find the lease and read the clause on alterations. It will fall into one of three shapes.

An absolute bar says no alterations, full stop. The landlord can refuse without giving a reason, and the only route is a negotiated variation.

A qualified covenant says no alterations without the landlord’s consent. This is the common one, and it is where tenants have real protection. Section 19(2) of the Landlord and Tenant Act 1927 turns that into consent not to be unreasonably withheld where the work is an improvement. A fitted split system that makes the space usable in summer is an improvement on almost any reading. A fully qualified covenant spells out the same protection in the lease itself.

Refusing because the landlord dislikes cooling is not reasonable. Refusing because a condenser would sit on a listed shopfront, or because the roof cannot take the load, is.

The licence to alter

Consent normally arrives as a licence to alter: a short deed signed by landlord and tenant that names the works, attaches the installer’s drawings and specification, and sets the conditions.

Expect to pay the landlord’s professional costs as well as your own. For a wall-mounted system in a single-storey unit, the landlord’s solicitor and surveyor fees usually land between £750 and £2,000. Anything touching a roof, a shared plant area or a listed elevation runs higher.

Budget four to six weeks from first request to signed licence. Managing agents move at their own pace, not yours. Ask on day one for the full list of what the landlord needs, which is normally the installer’s F-Gas certification, public liability insurance, a method statement, a drawing showing the condenser position, and the noise data for the outdoor unit.

The condenser decides how hard this gets

Indoor work inside your own demise is the easy part. The outdoor unit is where leases bite.

External walls, the roof and any shared yard are usually retained by the landlord even under a full repairing and insuring lease. Putting a condenser there is not just an alteration, it needs a right to use the landlord’s property, and the licence has to grant it. The same goes for a pipe route through a shared riser or corridor.

Three positions in rough order of ease: your own rear elevation or enclosed yard, a flat roof, and a front or side elevation facing a street. The last one brings planning into it. Commercial permitted development rights are narrower than domestic ones, and a conservation area or a listed building removes them. Our rooftop condenser rules guide covers load, access and acoustic screening.

Reinstatement is the clause that costs money later

The licence will say what happens at the end of the term. Get this settled before signing, not at exit.

The default wording obliges the tenant to remove the system and make good on expiry. That turns a working asset into a dilapidations line item, and landlords price removal generously when the schedule lands. On a three-head system it can run to a few thousand pounds.

Two better outcomes are worth pushing for. The first is a licence that says the works may remain at the end of the term at the landlord’s option, which usually means they stay. The second is agreement that the system passes to the landlord as a building improvement, in exchange for a longer rent-free period or a contribution to the install.

Multi-let buildings and the service charge

If you are one unit in a building with landlord plant, ask before specifying anything. Some run a central system with a fixed capacity per unit, and adding your own kit either breaches the lease or duplicates something the service charge already covers.

Where landlord cooling underperforms, the first move is a written complaint about the service charge item, not a purchase. Where there is none, a standalone split keeps the running cost on your own meter.

What it costs

Install prices do not change because you rent. A single open plan retail unit or small office runs £2,500 to £4,500 fitted. A salon, restaurant or medium retail floor needing several cassettes and a heavier duty compressor sits at £5,000 to £12,000. Add the licence fees on top.

Set that against the winter side of the same kit. A modern split delivers around three units of heat per unit of electricity, so the system that saves your August trade cuts what you spend heating the unit from October. We ran the retail numbers in shop and salon cooling.

If the lease has under three years to run with no renewal agreed, the maths gets tighter. A tenant with security of tenure under the Landlord and Tenant Act 1954 is investing in a space they will keep.

The order to do it in

1. Read the alterations clause and note which of the three types it is.
2. Get a survey and a written specification, including the condenser position and its noise figure.
3. Send the landlord or agent a consent request with the drawing, specification and installer credentials attached.
4. Negotiate the reinstatement wording before the licence is engrossed.
5. Check planning if the condenser faces a street or the building is listed.
6. Book the install once the licence is signed.

Starting the paperwork in August puts the install in early autumn, when commercial lead times are shorter than they are now. The alternative is starting next June and joining the queue.

Get quotes you can put in front of a landlord

Tell us the type of unit, its floor area and where you think the outdoor unit could go on the quote form, and mention that the premises are leased. We will match you with commercial installers who survey the building and produce the drawing and specification a landlord needs to see. Three fixed quotes back within 24 hours.

Check the prices page for a rough bracket first, or email us a question if you want to talk it through before requesting quotes.