Explain your daylight and opening requirements. The existing rooflight and upstand need to be measured and assessed, not sized from a photograph alone. Ask whether removal, disposal, roof connections and interior finishing are included. Clarify any electrical work separately. Keep product information, instructions and completion photographs for maintenance or future changes to the surrounding roof.
Begin with how you want to use it
Explain daylight needs, whether opening is required and any existing complaint. Mention other planned roof work. The right proposal depends on the existing opening, roof build-up and intended use together.
Have the existing situation measured
Ask for an assessment of the rooflight, upstand and surrounding roof. A photograph does not establish precise dimensions or the condition of concealed parts. Clarify what needs investigation before a replacement model is selected.
Check the quotation boundaries
Compare removal, disposal, new upstand where needed, fastening and roof connections. Ask separately about electrical work and interior finishing. If the opening changes, discuss whether additional assessment and other work are required.
Keep information for maintenance
Retain the model, dimensions, product information and operating instructions. Ask how maintenance and future replacement parts are handled. Keep written warranty conditions with the completion record rather than relying on a verbal description.
Compare complete installations
A price for the dome alone is different from a complete installed rooflight. Check upstand, controls, waterproofing connections and internal work. Use the same opening and scope when comparing the final totals.
Coordinate with roof renewal
If insulation or roof covering is also being replaced, discuss the rooflight within that plan. Ask how heights and connections align and which work comes first. Keep the agreed dimensions and final products together.