Roof repair quotes are hard to compare because two roofers can describe the same problem in totally different ways. One might quote for a quick patch. Another might quote for a proper rebuild of the detail. Therefore, you need a simple method that forces quotes into the same “units” so you can judge value, not just price.
Here’s a practical apples-to-apples approach UK homeowners can use.
Step 1: Make Sure Everyone Is Pricing the Same Problem
Before you compare numbers, confirm the diagnosis and location match.
Ask each roofer to state:
- where the leak/damage is (e.g., rear valley, chimney back flashing, garage roof edge)
- what they believe is causing it
- what they will do to fix it
If one roofer says “chimney flashing” and another says “valley lining”, you’re not comparing quotes — you’re comparing diagnoses. In that case, ask for photos or a clearer explanation.
Step 2: Standardise the Scope Into 5 Buckets
Put each quote into the same buckets. Then you can compare like-for-like.
Bucket A — Access & safety
- ladders vs tower vs scaffolding
- is scaffolding included?
- is it a one-day scaffold or multi-day?
Why it matters: Access can be a huge chunk of cost and can affect quality.
Bucket B — Strip-out and prep
- removing old mortar/felt/lead/tiles
- cleaning, drying, priming (flat roof repairs)
- raking out before repointing
Why it matters: Prep is what makes repairs last. Skipping it makes a quote look cheap.
Bucket C — Materials and specification
- tiles/slates: matching type where possible
- leadwork: new vs “patch existing”
- flat roof: felt vs EPDM vs GRP, thickness/spec
- fixings, trims, outlets: replaced or reused
Why it matters: “Replace flashing” can mean anything unless materials are specified.
Bucket D — Detailing (the usual failure points)
This is where cheap repairs often cut corners:
- chimney chase line sealed properly
- step flashing/soakers included (if relevant)
- valley corners and upstands properly formed
- edges/drip trims renewed on flat roofs
- outlets cleared/replaced and tested
Why it matters: Most leaks are at details, not the middle of the roof.
Bucket E — Clean-up, warranty and paperwork
- waste removal / skip quotes
- before/after photos
- warranty length and what it covers
- payment terms and VAT status
Why it matters: A professional quote is usually clearer and reduces disputes.
Step 3: Convert the Quote Into “Units”
To compare apples-to-apples, translate each quote into measurable units:
For tiled/slate repairs
- number of tiles/slates being replaced
- metres of ridge/verge/valley being worked on
- chimney leadwork: which pieces (apron, step flashing, back detail)
For flat roofs
- area being patched/repaired (m²)
- whether edges/outlets/upstands are included
- whether it’s patch vs overlay vs strip-and-replace
For gutter-linked leaks
- gutters cleared? joints resealed? downpipe checked?
- spill paths corrected?
If a quote doesn’t include units, ask for them. It forces clarity.
Step 4: Watch for “Quote Compression” Tricks
These are common ways a quote looks cheaper than it really is:
1) Excluding scaffolding
The quote may look low until access is added later.
2) Pricing a patch when you need detail work
A patch might stop water briefly, but the leak returns because edges/outlets/flashing weren’t rebuilt.
3) Vague wording that allows upselling
“Fix leak” or “repair roof as required” often becomes a blank cheque.
4) Excluding waste removal
Disposal and skip hire can add more than you expect.
5) No mention of warranty
If there’s no warranty, you’re taking the risk.
Step 5: Ask These 7 Questions (Copy/Paste)
Send this to each roofer so you get comparable answers:
- What is the cause of the leak/damage and where exactly is it?
- What repair method will you use (patch/replace/rebuild)?
- What materials are included (and are trims/outlets/flashings new)?
- What access is included (scaffold/tower/ladders)?
- Is waste removal included?
- What could increase the price, and how will you agree extras?
- What warranty do you provide and what does it cover?
When each roofer answers the same questions, you can compare properly.
Step 6: Score Quotes With a Simple 10-Point System
If you want a quick decision tool, score each quote (0–2 points each):
- Clear diagnosis + photos (0–2)
- Specific scope with units (0–2)
- Good detailing included (0–2)
- Access and waste clearly included (0–2)
- Warranty and payment terms clear (0–2)
A quote that scores 8–10 is usually easier to trust than a quote that scores 3–5, even if it’s slightly higher.
Step 7: Decide What “Best Value” Means for You
If it’s an active leak, value often means:
- fastest safe fix
- clear scope
- warranty
- proper detail work so it doesn’t come back next month
If it’s a non-urgent repair, value might mean:
- scheduling at a convenient time
- combining jobs while scaffolding is up (chimney repointing + flashing, ridge + verge, etc.)
Mini Examples: Why Quotes Differ
Example A: Chimney leak
- Quote 1: “Seal around chimney”
- Quote 2: “Replace step flashing and renew chase sealing; check soakers; refit tiles around stack”
These aren’t the same job. The second quote usually lasts longer because it addresses the system, not just the symptom.
Example B: Felt garage roof leak
- Quote 1: “Patch leak”
- Quote 2: “Recover roof with new cap sheet, renew edges and outlet detail”
If the roof is brittle and patched already, the second quote can be better value even if it costs more.
FAQs
Should I always pick the cheapest quote?
Not for roof repairs. The cheapest quote often has the loosest scope or skips access, prep, and detailing.
How many quotes should I get?
Usually at least 2–3. If you get wildly different diagnoses, get another opinion.
What’s the biggest reason roof repairs fail?
Poor detailing and poor preparation. Water finds weak joints, edges, outlets, and junctions first.
Want to compare quotes faster? Submit one enquiry with your postcode and a short description of the issue. We’ll connect you with local roofers so you can compare free, no-obligation quotes.
