Mechanical assessment in Deal should include cottage room volumes, solid-wall routing, condensate on tight yards, and a condenser location that can be serviced without occupying the only rear path. Coastal exposure still matters on Walmer and Kingsdown elevations.
Deal and neighbouring historic streets include conservation areas, and some locations are covered by Article 4 Directions that can restrict external alterations. If the outdoor unit would affect a protected building or street, check with Dover District Council before work starts. Installers can advise on typical cottage siting, but they are not the planning authority.
For typical house rules, listed buildings and when to check with the council, see planning permission for domestic air conditioning. If the building is protected, the council decides — an installer can help you think about where the unit would go.