Define the same job for every quote
List the rooms or elevations, ceilings, walls, doors, frames, skirting, fitted items and wallpaper separately. Note known damage, stains, access restrictions and whether the property will be occupied. Without one shared scope, two prices may describe very different jobs.
Look for preparation detail
Ask what cleaning, filling, sanding, local repairs, stain treatment and primer are included. The correct work depends on the existing surface, so a decorator should inspect uncertain areas before promising a finish. A brief price that says paint rooms may exclude the stage that has the greatest effect on the result.
Check insurance and relevant experience
Confirm that the business is insured for the type of property and work involved. Relevant examples matter more than a large unexplained gallery: school work should show education projects, exterior work should show exterior preparation, and detailed interiors should show the standard around trim and junctions.
Compare products and finish levels
A quote should identify the surfaces and intended finish or explain when the exact coating will be agreed. Check manufacturer suitability for the substrate, cleaning needs and environment. Colour, sheen and number of coats should be discussed together with the condition beneath them.
Agree access, protection and timing
Establish who moves furniture, how floors and fixtures will be protected, where materials can be stored and which areas must remain usable. For offices, schools and managed properties, agree working hours, security, other trades and the person responsible for handover.
Be cautious with unclear promises
An unusually fast programme or low figure may omit drying time, preparation or difficult access. Ask for exclusions and assumptions in writing. A professional answer can still include uncertainties, but it should explain how they will be handled if hidden defects appear.