Comparing flat roof quotes is easier when you can see exactly what each contractor has allowed for. Two totals may describe different work, even when both quotations say “replace the flat roof”. A missing item might be excluded, covered by an allowance or still waiting for an inspection.
Use these five questions to compare the written proposals for your Liverpool property. They help you identify gaps and ask for clarification before choosing. You do not need to diagnose the roof or decide how the work should be carried out.
Start with the same roof and proposed work
Check that every quotation identifies the same roof area and purpose of the work. A local repair, an overlay and a replacement involving removal of the existing covering are different proposals. Ask each contractor to explain the approach and the findings supporting it.
Keep the proposed covering or system name beside the description of the work. Check whether roof edges, wall junctions, outlets and any rooflights are included. If descriptions differ, ask what those differences mean for your roof rather than trying to compare the totals alone.
1. Are roof deck repairs included?
The deck is the supporting surface beneath the roof covering. Ask whether the quotation includes retaining it, replacing a defined area or deciding what is needed after the covering is removed.
The NFRC’s advice on choosing a roofing contractor notes that refurbishment estimates may change when removal reveals the structure underneath. Ask what has been checked and what remains unknown on your particular job.
- Which deck work is already included in the description?
- Is there an allowance, and what does that allowance cover?
- How would additional work be explained and agreed?
Keep this discussion focused on the quotation. Our guide to unexpected findings during a flat roof replacement covers the separate decision if a specific issue is discovered during work.
2. What does the quotation say about insulation?
Look for a clear statement about whether insulation is being retained, altered or replaced. If it is included, ask for the proposed specification and the roof area it covers. “Insulation included” leaves questions unanswered if another contractor has described a different arrangement.
Ask the contractor to explain how the proposal suits the existing roof and the intended work. If building requirements need to be considered, ask who will establish what applies and whether any associated work is included. Do not assume every replacement has the same requirements or choose an insulation specification from a general article.
If insulation is excluded, record that explicitly. You can then ask why the proposals differ before making your comparison.
3. Are stripping, removal and disposal included?
Ask which existing materials will be removed and which will stay in place. A description of the new covering alone does not explain the preparation beneath it.
Check the practical arrangements too: who removes the old materials, whether disposal is included and whether any skip or other waste arrangement appears separately. Ask what clearing and tidying is included at the end of the agreed work.
If one proposal retains materials that another removes, request an explanation of each approach. Neither the amount removed nor the headline total, on its own, tells you which proposal is suitable. The contractor needs to explain the basis for the work being recommended.
4. What access and working arrangements have been allowed for?
Tell each contractor about the same restrictions, including a narrow passage, access through the house or a shared route. Ask whether the quotation includes the access equipment and arrangements required for the proposed work. Clarify any arrangements you would need to make separately.
You can also ask where materials and waste would be placed, and how normal household access would be managed. Leave the choice and design of working methods to competent professionals.
Do not climb onto the roof to obtain measurements or photographs for a quotation. Keep your observations indoors or at ground level. HSE’s roof work guidance explains the risks of falls and fragile surfaces.
5. Does the written total include VAT and all the stated work?
Ask each contractor to confirm the total for the described work, whether VAT applies and how it is shown, any exclusions, and how long the quotation remains valid. Check the proposed payment stages and how possible extra work would be handled.
Also clarify whether the document is a quotation or an estimate, and what assumptions remain. Citizens Advice’s guidance before building work explains the distinction and recommends getting clear written details before agreeing work.
Keep written clarifications with the relevant version of the proposal so you can see what each total covers.
Make a short comparison record
For each of the five questions, note the answer beside each contractor’s name. Use “included”, “excluded”, “allowance” or “needs clarification”, then add the relevant detail. A blank space should remain an open question.
Send each contractor the points you need clarified. If a revised quotation arrives, compare that version and keep the earlier one separately. Once work is agreed, retain the accepted proposal with the documents you keep after a roof replacement.
Discuss a flat roof quotation with J&S Roofing
If you are considering flat roofing work in Liverpool, use these questions to prepare your enquiry. Contact J&S Roofing with the property details, the roof area concerned and any known access restrictions, and ask what information is needed for the next step.