Commissioning a Condition Survey on a Historic Building

A guide to getting a survey that tells you what you actually need to know — what the different survey types cover, what to ask for, and why most surveys of historic buildings disappoint.

Building Restoration Index — Technical Library. By Paul Stenning and Mike Walters, Historic Buildings Advisors, Tuscan Foundry Products.

Why surveys disappoint

The complaint is consistent: the report was long, expensive, full of caveats, and did not answer the question the client actually had.

Four causes account for nearly all of it.

The wrong product was bought. A valuation, or a homebuyer-level report, on a building that needed a full building survey.

The surveyor lacked historic building experience. Solid wall construction, lime mortars, timber frames and permeable fabric behave in ways that a surveyor trained principally on modern construction will flag as defects. The result is a report that describes normal historic building behaviour as failure, and recommends treatments that would cause harm.

Access was not arranged. Roofs not inspected, floors not lifted, roof voids not entered, drains not tested. Everything then becomes a caveat, and the caveats become the report.

The brief was vague. “Survey the building” produces a general report. A brief that states the decision the client is trying to make produces something useful.

The fix for all four is in the instruction, and the instruction is written before anyone visits.

The survey types, and what they actually are

Mortgage valuation. Not a survey. It is an assessment of the property’s value for the lender’s purposes, and it exists to protect the lender. It tells the buyer almost nothing about condition. Many purchasers of historic property have relied on one and regretted it.

Homebuyer-level report. A standardised intermediate report using a traffic light condition rating. Calibrated for conventional, reasonably modern housing. On a historic building it tends to produce a page of amber and red ratings that reflect the format’s limitations rather than the building’s condition, and it generates recommendations for further investigation on almost everything.

Building survey (formerly a full structural survey). A detailed, narrative report on construction and condition, tailored to the building. This is the appropriate instruction for a historic building, and the only one of the three that gives room to explain why something that looks like a defect is not one.

Structural engineer’s report. Not a general survey. Instructed for a specific structural question — movement, cracking, load capacity, a proposed intervention. Commissioned in addition to a building survey, usually on the surveyor’s recommendation.

A note on terminology: the format names in the market change periodically, and providers use their own product names. Ask what is actually included rather than relying on the label.

Specialist surveys for historic buildings

Several targeted surveys answer questions a general survey will not, and knowing they exist is half the value.

• Roof survey, by drone or with access equipment, giving a proper view of valleys, flashings, chimney junctions and gutter interiors
• Timber survey, assessing decay and beetle, ideally by someone who does not sell treatment
• Independent damp investigation, with gravimetric and salt analysis rather than resistance meter readings
• Drain survey, by camera and pressure test — cheap, and it resolves a surprising proportion of unexplained damp
• Mortar analysis, establishing binder and aggregate for repointing specification
• Paint analysis, establishing historic decorative schemes before stripping
• Dendrochronology, dating timber structures and frequently transforming understanding of significance
• Measured survey, laser scanning or photogrammetry, producing the record base for design and consent applications
• Thermal imaging, locating cold bridges, missing insulation and some damp
• Asbestos and lead paint surveys, which are duties rather than options in many circumstances
• Bat and nesting bird assessment, which is a legal requirement before many roof and structural works and which routinely delays projects that did not allow for it

That last one deserves emphasis. Bats and their roosts are protected, and works to roofs, towers and voids frequently require assessment and sometimes a licence. Survey seasons are constrained. Discovering this after the scaffold is up is expensive.

What a historic building survey should cover

A survey of a historic building should tell you:

What the building is. Construction, phasing, materials, and how it was designed to perform. A surveyor who cannot describe the construction cannot assess it.

What is wrong, and why. Not just a list of defects but the cause of each. “Damp to the north wall” is an observation. “Damp to the north wall caused by the defective downpipe at the rear and by the path laid over the plinth” is a survey.

What is not wrong. Historic buildings display characteristics that look like defects and are not: distortion that settled generations ago, fine cracking in lime plaster, spalled brick faces, eroded mortar joints, seasonal movement. A good report says so explicitly, because the alternative is an owner spending money on non-problems.

Priority. Separated into urgent, necessary within a stated period, and desirable. Everything cannot be urgent.

Indicative costs. Broad, caveated, but present. A schedule of repairs without any cost indication is difficult to act on.

What could not be inspected, and what would be needed to inspect it. This section is more useful than most clients realise, because it tells you what risk remains.

Consent implications, flagged where works would require Listed Building Consent.

A maintenance regime, because most defects in historic buildings are deferred maintenance.

Access: the thing that determines quality

The single biggest determinant of a survey’s usefulness is what the surveyor was physically able to look at.

Arrange in advance:

• Roof access or a drone survey. Ground-level inspection with binoculars misses valleys, flashings and gutter interiors almost entirely.
• Roof void access. Hatches unblocked, stored material moved, lighting available.
• Floor access. At least some floorboards lifted, particularly near external walls and at joist ends.
• Sub-floor void access, where suspended floors exist.
• Cellars and basements.
• Furniture moved away from external walls, and floor coverings lifted where possible.
• Services accessible — stopcocks, meters, boiler, consumer unit.
• Drain covers liftable, and located.
• Vegetation cut back from the base of walls.

Where the property is being purchased, access is negotiated with the vendor and frequently limited. Whatever is refused should be recorded in the report as an unassessed risk, and factored into the decision.

Inspect in wet weather where possible. A dry-weather survey cannot assess rainwater goods, and rainwater goods are the largest single cause of decay in historic buildings.

Choosing a surveyor

Look for:

• Demonstrable historic building experience, not just willingness. Ask what proportion of their work is on pre-1919 buildings.
• Conservation accreditation where the building is significant.
• Independence from remedial contracting. A surveyor who also sells damp-proofing or timber treatment has an interest in the diagnosis.
• Willingness to say what is not a problem. In conversation, a surveyor who volunteers that some things about old buildings look alarming and are not, is telling you something useful.
• Sample reports. Ask to see one, redacted. It shows you what you will get.
• Professional indemnity insurance at an appropriate level.

Ask directly: “How would you approach damp on a solid wall?” The answer separates surveyors quickly. A surveyor who reaches for injection and tanking is not the right choice for a historic building.

Writing the instruction

The instruction is where most of the value is created or lost. State:

• The decision you are trying to make. Buying? Budgeting a repair programme? Resolving a specific defect? Planning a phased programme over ten years? The report should be written to answer that.
• The survey type you are commissioning.
• The scope, including specialist surveys you want included or excluded.
• The access being provided, and what you have arranged.
• Whether costs are required, and at what level of detail.
• Whether prioritisation is required, and over what timescale.
• Whether consent implications should be flagged.
• The output format, and whether a follow-up meeting or site walk-round is included. A conversation with the surveyor on site after the report is often worth more than the document.
• Timescale.

Ask for a schedule of works as an appendix, if you intend to obtain quotes. A narrative report is hard to price from; a schedule is not.

Reading the report properly

Read it in this order:

1. Limitations and exclusions first. This tells you what the report does not cover, and it is where the risk sits.
2. The urgent items.
3. The causes. Check that each defect has one. Defects without stated causes are observations, and you should go back and ask.
4. The costs, and whether they include access, professional fees and VAT.
5. The consent flags.
6. The maintenance recommendations, which are the cheapest thing in the report and the most frequently ignored.

Go back with questions. A good surveyor expects to be asked, and the conversation frequently produces more than the document. Where a report says “further investigation recommended” on something significant, establish what that investigation would cost and what it would resolve before deciding whether to commission it.

Be sceptical of any recommendation for a proprietary treatment system that appears without a stated cause.

Turning a survey into a programme of works

A survey is an input, not a plan. Converting it:

1. Group by cause, not by location. Six damp patches caused by one gutter are one job.
2. Do the water first. Rainwater goods, roof, flashings, ground levels. Almost everything else depends on it.
3. Allow drying time before internal reinstatement. This is a programme item, not a delay.
4. Sequence by access. Anything requiring scaffold should be done while the scaffold is up. Scaffolding twice is a very expensive mistake, and it drives more wasted money on historic buildings than almost anything else.
5. Separate consent-requiring work and start those applications early.
6. Phase realistically. Most owners cannot do everything at once. A ten-year programme with the urgent items in year one is better than an unaffordable comprehensive scheme that never starts.
7. Build in maintenance from the outset.

Pre-purchase surveys on listed property

Additional matters specific to buying:

• Check the list entry against the building. Discrepancies indicate alteration, which may have been unauthorised.
• Establish the consent history. Ask the vendor for consents and completion correspondence. Absence is not proof of a breach, but it is a question.
• Look for common unauthorised works — subdivided rooms and inserted en-suites, replacement windows, removed chimneypieces, altered staircases, removed boundary railings.
• Understand that liability passes to you. There is no time limit after which unauthorised listed building works become lawful, and enforcement can require reversal at the owner’s cost.
• Where a breach is found, the position is normally addressed either by the vendor obtaining consent before completion, or by reflecting the risk in the price on the basis that you will apply retrospectively.
• Get the drains tested, and the roof looked at properly. These are the two items most often skipped and most often expensive.
• Allow for the ongoing cost. A historic building is a maintenance commitment, and the survey should give you a realistic sense of the annual figure rather than only the immediate one.

Quinquennial and planned maintenance regimes

For churches, institutional buildings and estates, condition inspection is normally periodic rather than one-off — traditionally on a five-year cycle for ecclesiastical buildings, with annual or more frequent checks on specific elements between.

The value of a cyclical regime is that it catches deterioration early, when it is cheap. Its weakness in practice is that reports are produced and then not acted on, so the same items recur across successive cycles with rising urgency.

What makes a regime work:

• An annual gutter and roof check between full inspections, recorded
• A named person responsible, with a budget line
• Carrying forward outstanding items explicitly from cycle to cycle, so deferral is visible
• Small annual spend on maintenance, rather than large periodic spend on repair
• A log — what was done, when, by whom, in what materials

Costs and what they buy

Survey fees vary widely with building size, complexity, location and scope, and specialist surveys are priced separately. Rather than quoting figures that will date, the useful principles are these:

• The cheapest report is rarely the best value, because the difference in fee is small relative to the cost of a missed defect.
• Access provision is often the larger cost, particularly where scaffold or a platform is required. Drone survey has changed this considerably for roofs.
• Specialist surveys are individually inexpensive relative to the works they inform. Mortar analysis, paint analysis and drain testing all cost a fraction of the work they prevent being done wrongly.
• A follow-up conversation is usually free or cheap and is frequently the most valuable part.
• Budget for the survey as part of the project, not as an overhead resented before the real work starts.

Always confirm what is included, what is excluded, whether VAT applies, and whether access equipment is within the fee.

Common mistakes

Mistake	Consequence
Relying on a mortgage valuation	No meaningful condition information at all
Homebuyer-level report on a historic building	Format-driven caveats; normal historic behaviour flagged as defect
Surveyor without historic building experience	Harmful recommendations; lime and solid wall behaviour misread
No access arranged	Report consists largely of exclusions
Dry-weather survey only	Rainwater goods, the main cause of decay, not assessed
Vague instruction	General report that answers no particular question
Surveyor who also sells the remedy	Diagnosis aligned with the product
Not reading the exclusions	Risk misunderstood
Acting on defects without addressing causes	Repeat failure
Scaffolding twice	Very large avoidable cost
No bat or nesting bird assessment before roof works	Legal exposure and programme delay
Survey filed and not converted into a programme	Deterioration continues; next survey is worse

Find a specialist

The Building Restoration Index lists vetted professionals for survey and investigation work:

• Surveyors — building surveys on historic and listed property
• Structural Engineers — conservation-experienced structural assessment
• Heritage Consultants — significance assessment and consent advice
• Architectural Historians — documentary research and phasing
• Non-Destructive Investigations — investigation without opening up
• Aerial Drone Surveys — roof and high-level inspection
• 3D Scanning — measured survey and recording
• Structural Timber Testing — assessment of timber condition
• Damp and Timber Decay — independent damp and decay investigation
• Drainage — drain testing and survey
• Materials Analysts — mortar, plaster and brick analysis
• Paint Research — historic decorative scheme analysis
• Architects — conservation-accredited practices
• Project Managers — converting a survey into a deliverable programme

Related guides in the library: Writing a conservation specification, Damp in historic buildings, Listed Building Consent. The full set is on the Technical Library page of the Building Restoration Index.

Frequently asked questions

Is a mortgage valuation a survey?

No. It assesses value for the lender and tells you almost nothing about condition.

Which survey should I get for a listed building?

A building survey, from someone with genuine historic building experience, with access arranged and a clear brief.

Why does my homebuyer report flag everything?

The format is calibrated for conventional modern construction. Historic building characteristics trigger caution ratings that reflect the format, not the building.

How do I find a surveyor who understands old buildings?

Ask what proportion of their work is pre-1919, look for conservation accreditation, and ask how they would approach damp on a solid wall.

Should the surveyor also carry out the repairs?

No. Independence from remedial contracting matters, particularly for damp and timber.

What access should I arrange?

Roof or drone, roof void, some lifted floorboards, sub-floor voids, cellars, drain covers, and services. Cut back vegetation at the base of walls.

Can a survey be done in dry weather?

It can, but rainwater goods cannot properly be assessed. Wet weather inspection is considerably more informative.

Is a drone survey worth it?

Usually yes. It gives a proper view of valleys, flashings and gutter interiors at a fraction of the cost of access equipment, and produces a record you can revisit.

What should I do about “further investigation recommended”?

Ask what it would cost and what it would resolve, then decide. Do not simply ignore it or accept it automatically.

Do I need a structural engineer as well?

Only for a specific structural question — movement, cracking, load, or a proposed intervention. Usually on the surveyor’s recommendation.

Should I get the drains tested?

Yes. It is inexpensive and it resolves a surprising proportion of unexplained damp.

Do I need a bat survey?

Frequently, before roof, tower or void works. Bats and roosts are protected, survey seasons are constrained, and discovering this late is expensive.

What if the vendor limits access?

Have the limitation recorded in the report as an unassessed risk and factor it into your decision and your offer.

How do I know if past works were consented?

Compare the building against its list entry, ask the vendor for consents, and look for the common unauthorised alterations. Liability passes to you on purchase.

How should I prioritise the repairs?

Group by cause, do the water first, allow drying, and do everything that needs scaffold while the scaffold is up.

What is a quinquennial inspection?

A cyclical condition inspection, traditionally every five years, used for churches and institutional buildings, with lighter checks between.

Is the cheapest survey good value?

Rarely. The fee difference is small relative to the cost of a missed defect on a historic building.