Define the decision the survey must support
State whether the survey is intended to investigate water entry, plan maintenance, inform a purchase or lease, prepare a repair scope, support an approval discussion or review a specific material. Different questions require different access, records and reporting depth.
List the known symptoms, affected rooms or roof zones, timing, weather relationship and previous interventions. Avoid asking for a general condition opinion while expecting a complete specification. A clear purpose lets the survey identify what evidence can be gathered now and what may need a later stage.
Assemble status, records and governance
Provide listing or conservation information, available drawings, previous surveys, consents, specifications, invoices, maintenance logs and photographs. For shared, institutional or church property, also identify the owner, authorised contact and people who must receive or approve the findings.
Records can show whether a visible detail is original, approved, temporary or part of a recurring repair. Missing documents should be logged as an evidence gap rather than filled with assumptions. The survey can then recommend where archive, planning-authority or stakeholder checks are needed.
Choose access that matches the questions
Separate safe ground-level, internal, roof-void and close-access observations. Record which slopes, valleys, gutters, parapets, towers or concealed spaces cannot be seen and why. Drone imagery or photographs may extend visual coverage, but they do not by themselves confirm concealed support or material condition.
Closer access and opening-up should answer defined questions and have the owner's approval. Plan around fragile slate, rainwater goods, occupied areas and weather protection. If access remains incomplete, the report should state how that limitation affects confidence and what investigation would reduce it.
Inspect the roof as connected fabric
Map coverings, fixings where visible, ridges, valleys, leadwork, chimneys, skews, parapets, gutters, outlets, masonry and accessible roof-void signs. Note interfaces and water routes rather than placing every defect into a separate material list with no explanation of how the parts interact.
Record location, extent, pattern and apparent activity. Internal staining may be historic; a displaced slate may not align with the leak; an overflowing gutter may saturate masonry below. Compare observations across the building and identify whether additional monitoring or testing is needed.
Separate observation, interpretation and uncertainty
A useful report distinguishes what was directly seen, what is a reasoned interpretation and what remains unknown. Use annotated photographs and roof-zone references. Avoid presenting a hidden defect, exact material composition or structural condition as confirmed when the survey method could not establish it.
For each likely cause, explain the supporting signs and reasonable alternatives. Recommend targeted opening-up, monitoring, material analysis or specialist structural advice only where it would change a decision. This gives the owner a route to reduce uncertainty instead of a long unprioritised caveat list.
Produce priorities and specification inputs
Group findings into immediate protection, short-term repair, planned maintenance and further investigation. Give each item a location, defect, consequence, proposed next action and dependency. Urgency should reflect observed risk and building use, not a generic age-based schedule.
Where evidence is sufficient, add material and detail requirements: retention boundaries, slate matching criteria, lead function and movement questions, mortar assessment, drainage work and access assumptions. Where it is not sufficient, state the information required before a price or permanent specification can be reliable.
Connect the report to approvals and the next action
Flag building status and proposals that may need planning-authority advice, but do not present the survey itself as consent. Attach relevant photographs, drawings, material notes and options so the authority or appointed conservation adviser can understand the actual change under discussion.
An assessment enquiry should include the survey purpose, address, known designation, access information, symptoms and available records. Review can then focus on whether an initial visual survey, closer investigation or another professional input is the proportionate next step, without promising diagnosis, cost or attendance.
