Setting contingency for a €171,400 renovation of a 230 m² Helsinki coastal home

[mapTheEmber]

The finish choices were not what made me question the €171,400 budget. It was the fact that contractors excluded different pieces of work, making their totals for the 230 m² Helsinki coastal home difficult to compare.

The project covers the kitchen, bathrooms, floors, decoration, an electrical assessment and moderate energy improvements, but no extension. The uncertain areas are hidden moisture, plumbing access, electrical work found after surfaces are opened, sequencing and materials with long lead times.

My current rule would be to retain a larger contingency while those items remain unresolved, then reduce it if targeted inspections and quotes based on a common scope provide better evidence. What should the surveyor examine or open up? I also need to know which assumptions, exclusions, electrical items and permit-related costs should be settled before appointing a contractor.

 

[kian_finance]

I would not choose a contingency until the exclusions are put into one common list. As an initial allowance, 15–20% seems defensible while moisture, plumbing access and electrical scope remain unresolved, but it should shrink as those questions are answered.

Ask every contractor to price the same scope and identify assumptions, client-supplied items, demolition, disposal, protection, making good and testing separately. A low total with broad exclusions is not necessarily the cheaper offer.

 

[anchor.honest]

What is known about the building’s age, earlier bathroom work and whether the plumbing is accessible without opening finished surfaces? Those details could change the risk more than the floor area does.

I’d also ask the surveyor where targeted openings would provide useful evidence. A visual moisture inspection alone may not settle what is behind bathroom finishes or around external walls.

 

[kian_finance]

Age and renovation history matter, but I would not let them substitute for evidence. Even a documented bathroom can leave uncertainty about adjacent construction or later alterations. If targeted openings are feasible, agree in advance who opens them, who interprets the findings and who reinstates the surfaces.

The electrical “check” also needs definition: inspection only, testing, minor corrections, or an allowance for wider replacement? That single word could conceal very different scopes.

 

[bikesAndBirch]

One caveat on ordering early: lead times matter, but ordering the kitchen or bathroom items before demolition dimensions are confirmed can create another problem. Freeze the layout first, identify only the genuinely long-lead materials, and state who carries the risk if site dimensions differ.

Also, no extension does not automatically mean no structural work. Altering openings, moving heavy items or discovering damaged construction could still require additional assessment.

 

[moss.balanced]

I’m less comfortable with a blanket percentage than Adrian is. A contingency can become a convenient place for vague scope. I’d divide the reserve into named risks: concealed moisture, plumbing access, electrical corrections, minor structural repairs and schedule disruption. Keep finish upgrades outside it.

Then ask each bidder which of those risks is included, allowed for provisionally or excluded. That makes later changes easier to challenge and shows whether the €171,400 comparison is real.

 

[alex.hart]

A practical next step is a short pre-contract investigation package: moisture-focused inspection, confirmation of plumbing routes and access points, a clearly defined electrical assessment, and a permit discussion tied to the actual proposed work. Permit requirements and timing depend on the details, so get that clarified locally rather than assuming “no extension” settles it.

After that, issue the same room-by-room scope and exclusion schedule to every contractor. Require sequencing, lead-time assumptions and responsibility for opening and reinstatement to appear in the response. That should do more to protect the budget than negotiating finishes at this stage.