10 Questions to Ask a Stonemason Before You Hire
Stonemasons vary more in skill than almost any other trade in the home-building space. A poor patio is a tripping hazard. A poorly built dry stone wall slumps within a season. A fireplace surround in the wrong material discolours under heat. The questions below are the ones a homeowner in Ireland or the UK should put to any stonemason in writing before a deposit changes hands.
If a stonemason gives a clear answer to all ten in writing, hire them. If they keep half the answers verbal, walk away.
This is a spoke under our pillar guide on hiring a stonemason — covering the broader process, costs, and what to expect across project phases.
The 10 questions
1. What is your specialism?
Banker masons cut and shape stone at a bench. Setter masons lay stone on site. Dry stone wallers build without mortar. Restoration masons work on heritage and listed buildings. Monumental masons make headstones. Confirm which one matches your project before any other conversation. “General stonework” is not an answer.
2. Can you give me specific past projects I can see or photograph?
Real recent work, with addresses you can drive past or photographs you can examine in detail. Be wary of generic photo galleries with no context. The right answer is a list of locally-completed projects with dates and (where appropriate) contact permission to ask the client.
3. Are you a member of a recognised trade body?
Stone Federation Great Britain (UK and Northern Ireland), the Ethical Stone Register, or equivalent. Verify the answer against the body’s published member list — both bodies publish their members online. Membership is not the only proof of quality, but it is verifiable and gives you a complaints route if something goes wrong.
4. What is included in the quote?
Excavation. Sub-base type and thickness. Bedding method. Jointing material. Edging. Drainage falls. Waste removal. Sealing. Get every line in writing. A “supply and lay” quote without these specifics is not comparable to a turnkey quote.
5. What is explicitly excluded?
Anything not in the quote can become a mid-project variation cost. Common exclusions: drainage works if the ground is wet, edging detail, sealing on calcite-based stone, skip hire. Know what is not covered before you sign — and decide whether you want it added before, not after.
6. What is your realistic lead time and project duration?
A start date in three weeks and a 10-day install for a small patio is reasonable. A start date “soon” with no duration is a warning. Get specific dates in writing, with explicit weather contingency for external work.
7. What insurance do you carry?
Public liability cover is essential — typically £/€2-5 million minimum on residential work. Employer’s liability if there are staff on site. Ask for the policy number, not just confirmation. A working tradesperson should have these to hand.
8. What is your deposit and payment schedule?
A reasonable deposit is 10-25% of the quoted price to cover initial materials. Larger projects sometimes warrant up to a third for stone supply. Front-loaded demands above 50% before any work starts are a warning sign. Schedule the balance against project milestones — completion of groundwork, completion of laying, sign-off after pointing — not against time elapsed.
9. How will you handle defects or snagging?
What is their remedial period? Will they return to point joints once mortar has cured? Will they replace any cracked or damaged pieces during installation? Get the snagging schedule in writing. Most reputable stone trades carry a 12-month minimum defect period; some longer.
10. Will you provide a written contract?
Final question, and the most important. A written contract covering specification, price, schedule, payment milestones, and remedial period protects both sides. Avoid any stonemason who refuses one. Trade-body members are typically required to use a standard contract format.