To install an external aircon unit on the boundary wall of my property?

[Namechange129010]

We would install it on the exterior of the first floor wall, but our garden is on the other side, It would mean the unit would protrude outside of the property boundary, onto public land, but not be visible by any neighbours and it not a pathway or anything. if this doesn't bother anyone and no one can see it, is it legal?

try living in my house in summer and you may think differently. We actually stayed with my parents during the heatwave last July as their home was much more bearable.

Unless it's life or death you don't need aircon. It increases global warming.

OP it sounds like you need a properly ducted air con system. This way the units will be in your garden and the pipes/ducting will run internally. It will be more expensive, but that may be the only solution to your problem.

Blimey these answers, you’d think she had suggested swinging her new born naked from the roof.

op legally the airspace is owned by whomever owns the wasteland, but personally I’d go ahead if it is just wasteland and unused.

Out of interest... bearing in mind I'm not a planner or builder or lawyer...

Where is your guttering?

@Namechange129010

When it comes to planning permission I would not go down the ask forgiveness not permission route - a neighbour of ours has spent what looks like quite a lot of money building a roof terrace ( all within their boundary ) but the height is beyond what pp would allow . The people behind them have complained & they are going to be made to take it down and redo to council planning guidelines. Such a waste of money when they could have checked in the first place.

If the house layout isn't suitable then I think you are going to either have to compromise on indoor pipes or just buy some portable indoor aircon units for the times when you need them.

Planning permission can be irritating & some decisions may not suit you ( I know of one thing I would love for my house but I know pp would not be granted in a thousand years even though to me it seems a very innocuous thing ) but by & large it is there for a reason. Not just to ignore if it suits you . That said for eg Planning permission & Building regs I have found if you engage properly with the people who deal with this they can be helpful & might help you work out a solution.

OP just do it
Literally no one is going to notice it and if anyone ever does I'm sure you can just rectify it. People are being so ridiculous in their replies. You said it literally would face onto wasteland and no neighbours etc can see it. So who's going to notice and report you?!

Sensible reply that I agree with. Its an aircon unit not a bloody roof terrace and all these other suggestions people are going on about.

I don’t know about planning permission but you would in addition need to obtain a license or lease or purchase the freehold from the council’s legal department to manage this correctly from a legal perspective. The council may not notice but there are likely to be problems if you sold as you would be occupying land which you do not have title to.

I would just do it. We had an "illegal" air con at our old house and when we sold the house nobody asked anything about it

It was a grade 2 listed building too. It wasn't mentioned in the conveyancing stage or in the survey either.

Then it was a shit conveyancer and surveyor.