1) What is site supervision, and what is it not?
Site supervision is not just "going to look". It is not a mere formality to sign. It is not a pressure mechanism to speed up work.
Site supervision means: ensuring that project decisions are correctly applied on site, producing scientific and documented decisions when unexpected situations arise, and preserving the building's authenticity during implementation.
In short: if the project is right on the desk and right on site, the restoration is right.
2) Why is control more critical in historic buildings?
In a modern building a mistake can often be: corrected, redone, compensated with standard solutions.
In historic buildings: original material is unique, wrong intervention may be irreversible, lost value cannot be replaced. So in historic buildings control must be: more frequent, more detailed, more conscious.
3) Why don't project and site always match exactly?
During implementation in historic buildings the following often appear: hidden damage inside walls, structural traces not previously documented, unexpected material differences, problems left by earlier repairs. These situations are normal. What is abnormal is to deal with them by ignoring the project.
The task of site supervision: is not to ignore the problem but to read it correctly and relate it to the project.
4) Main responsibilities in site supervision
a) Compliance with the project — Does implementation match the approved project? Are intervention limits exceeded? Are details changed at will?
b) Material control — Is the mortar, stone and timber used of the quality defined in the project? Are sample approvals applied on site? Is material being changed out of craftsmen's habit?
c) Workmanship and method — Is the intervention reversible? Is original material being damaged? Are cleaning, repair and strengthening methods appropriate?
d) Documentation — Are new situations that arise during implementation recorded? Is the process documented with photos, notes and drawings? Are revision decisions put in writing when needed?
5) What happens when supervision is not done?
Where site supervision is weak: project violations become permanent, wrong material use goes unnoticed, original elements are unnecessarily removed, implementation proceeds "as the craftsman knows", and the board-approved project effectively ceases to apply. This is not only an aesthetic issue; it is a legal and ethical one.
6) The difference between supervision and "interfering with the work"
A common misconception: "Supervision slows the job." The truth: lack of supervision may seem to speed the job in the short term; but in the long term it creates cost for reversal, correction and stoppage. Site supervision is not about interfering with the craftsman's work; it is about protecting the building's rights.
7) How should decisions be made on a restoration site?
In historic buildings every decision made on site must: be based on documentation, have a clear justification, and be traceable afterwards. "This would be better" is not a sufficient justification for restoration. The right approach: if necessary stop implementation, evaluate alternatives, put the decision in writing.
8) What does site supervision mean for the client?
For the client, supervision is: a guarantee of the work done, assurance that the project is not exceeded, and a preventive against future problems. In a restoration without supervision the client: cannot fully know what was done, may not realise what they have approved, and carries long-term risk even if satisfied with the result.
9) Signs of good site supervision
- Regular site visits are made
- Implementation is documented with photos
- Sample and detail decisions are on record
- Quick but informed decisions are made when unexpected situations arise
- The link between project and implementation is not broken
If these signs are missing, supervision exists only on paper.
10) Conclusion: Restoration is protected on site, not at the desk
In historic buildings the real test of restoration is on site. There is no restoration without a correct project; but without correct supervision the project cannot be protected.
Site supervision: protects the building from error, not from the craftsman. It manages value, not intervention. It makes restoration invisible but lasting.