What does renovation of a building mean?

Renovation of a building means upgrading the whole structure, not just one room or one flat inside it: the roof, the external fabric, the services and the shared parts, as well as the individual spaces. Once you move beyond a single house, the building itself starts setting the rules.

Flats are the clearest case. Renovating a flat in a converted Victorian terrace in Crystal Palace or a small block in Lewisham means working within a lease. You will usually need a licence for alterations from the freeholder, party wall notices for the neighbours, and agreement before touching anything structural or shared, such as the joists between flats or communal pipework. We renovate a lot of ex-rental flats, and getting those consents lined up early is half the job.

Commercial buildings add their own layer: fire safety upgrades, accessibility, sometimes a change of use through the council. Period and listed buildings need the most care of all. Much of South East London sits in conservation areas, so external changes are restricted, and a listed building needs consent for almost any alteration, with materials to match: lime plaster, timber sashes, proper brick repairs. Renovating a building of that kind means renewing what is failing while keeping what makes it worth keeping. A single family house is the simple version of the same idea.