The short answer
An advising engineer can help surveyors understand structural risk, but they are not party wall surveyors and make no statutory decisions. Used well, with a defined scope, they add value; used badly, with role creep, they add cost without improving protection.
Why it matters
Their role is advisory — assisting the surveyors by reviewing structural proposals and commenting on risks relevant to the notifiable works. A competent advising engineer understands the party wall context, reviews relevant drawings and calculations, focuses on risk to the adjoining property, identifies missing information, helps with technically sensible award clauses, and keeps advice concise. They should not redesign the building owner’s scheme, act as project engineer, monitor the works unless separately instructed for a defined purpose, enforce the award, get into legal or fee disputes, or comment on matters outside the notifiable works. They should be instructed only once there is enough technical information to review, since premature instruction means repeated review, extra fees and delay. Where a surveyor relies heavily on engineering input, the surveyor’s own fee should reflect the reduced technical burden, so owners do not pay twice.
What to do now
- Identify the need for an advising engineer early, but instruct only when there is enough information to review.
- Give them a defined scope and obtain a clear fee estimate.
- Keep them separate from the project engineer, with advice addressed to the surveyors, not used as advocacy.
- Check the surveyor’s own fee reflects the outsourced technical work.
Common mistakes
- Letting the engineer redesign the scheme or creep into a project-engineer role.
- Instructing prematurely and paying for repeated review.
- Paying twice — full surveyor fee plus full engineer fee — for the same review.
When to call Coburns
If engineering input is being proposed and you are unsure whether it is needed or proportionate, send us the details and we will keep it focused.