Contingency and hidden risks for a 205 m² warehouse renovation in Rio

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pia.dean

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The R$1,422,000 draft budget looks workable on paper, but permit timing is my immediate concern. This is for a 205 m² warehouse renovation in Rio covering a kitchen, bathrooms, floors, painting, electrical investigation and moderate energy improvements, without adding floor space.

The wet areas may not remain beside the existing service points, so plumbing access and drainage could affect both cost and sequence. What level of contingency would you retain before opening up, and what should each contractor be required to state about exclusions and provisional sums? I also want to identify any approvals and lead times that could delay the programme rather than simply add a larger buffer.
 
I would initially reserve 15–20%, then reduce it only after opening up selected areas and completing electrical, plumbing and moisture investigations. Ask every bidder to list exclusions, assumptions and provisional items separately. “Electrical checks” is especially vague: clarify whether the price covers testing only, repairs to existing circuits, a new distribution board, or broader replacement.
 
What will the warehouse be used for after renovation, and are the kitchen and bathrooms staying near existing service points? Moving wet areas could make plumbing access and drainage much more important than the finishes. I’d also want to know whether the building is occupied or must remain partly operational, because that changes sequencing and contractor access.
 
Access to the existing services needs resolving early, even if keeping the kitchen and bathrooms in place seems like the cheaper route. That choice can limit plumbing disruption, but it does not tell you whether the roof, slab or metalwork is sound.

The absence of an extension is reassuring only up to a point. Equipment, partitions and altered layouts can still introduce loads or expose corrosion and moisture. I would compare the cost of a focused structural review and roof-and-wall moisture checks with the much less useful option of carrying an undefined extra allowance. Ask for the findings in writing and have bidders identify exactly which defects their prices include.
 
Agreed on investigating first, although inspections will not eliminate all uncertainty. I’d ask for a room-by-room scope linked to drawings, then a written responsibility matrix: who opens and reinstates walls, removes waste, protects existing areas, coordinates utilities, and pays for retesting after repairs? Those gaps often sit between trades rather than inside one quote.
 
Material lead times and permit timing should also appear in the programme, not just in the cost plan. Before ordering finishes, confirm the wet-area layout, electrical capacity and any work that needs approval. Otherwise an early purchase can become expensive storage—or unusable material—if the concealed work forces a redesign.
 
I wouldn’t automatically hold the full contingency inside the contractor’s contract sum. Keep a clearly controlled owner reserve and require priced approval before it is used. My practical sequence would be: confirm intended use and approvals, survey structure/moisture/services, make limited exploratory openings, freeze the wet-area layout, compare fully itemised bids, and only then set the final reserve. Also ask bidders which items they cannot price confidently yet and what evidence would let them firm those figures up.
 
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