Find the cause before recoating
A new finish can fail quickly if the substrate remains wet or unstable.
Old buildings can contain hazardous materials
Lead and asbestos concerns vary by age, material and jurisdiction; testing or qualified advice may be appropriate before disturbing suspect surfaces.
Surface preparation is part of the scope
A quote should say what repair and preparation occurs before finish coats.
Colour is the easy part
The durability of the result depends more on the substrate and environment than on the colour choice.
Safety boundary. General planning information only. Do not open, dismantle or work on hazardous electrical, gas, structural, fire-protection or contaminated-water systems unless you are appropriately qualified and authorized.