Contingency and sequencing for a £157,200 renovation in Birmingham

G

gate.grand

Property investor
I’m torn between setting one generous contingency and splitting the reserve by risk. The second approach seems more useful for this preliminary £157,200 renovation of a 1,880 sq ft coastal home in Birmingham, because hidden plumbing or moisture problems are different from optional finish upgrades.

The planned work covers the kitchen, bathrooms, flooring, decoration, electrical checks and moderate energy improvements, with no extension intended. Before fixing the budget, I want the surveyor and contractors to identify where plumbing can be accessed, what electrical work is excluded, whether any structural work could emerge, and how moisture will be investigated. I’ll also ask about lead times, approvals and who authorises extras. Would you hold separate reserves for hidden conditions and specification changes, and is limited opening-up work worthwhile before the final quote?
 
With several rooms being opened up, I would provisionally hold 15–20% outside the quoted works rather than burying it in allowances. On £157,200 that is £23,580–£31,440. Whether you need all of it depends on how much can be inspected before work starts.

Ask each contractor to state what happens if wiring, pipework or damp damage is exposed, including labour rates and who authorises extra work.
 
That range is useful. I had been treating contingency as one general line, but separating hidden-condition money from finish allowances sounds clearer. Would you also ask for selected floors or wall areas to be opened before the final price, or is that usually more disruption than it saves?
 
Before opening anything, clarify whether the home will be vacant during the renovation and whether kitchen and bathroom services can be unavailable together. That changes the sequencing significantly.

I’d ask the surveyor to identify where inspection was limited, especially around wet rooms, ground-floor edges and concealed plumbing. Then the contractor can propose a few targeted openings rather than exploratory demolition everywhere.
 
I wouldn’t automatically reserve 20% just because multiple rooms are involved. A flat percentage can obscure which risks are actually unresolved. List them separately: consumer unit and wiring, pipe routes, subfloor condition, moisture source, ventilation changes and possible approval timing. Price what can be priced, then keep the larger contingency only for items that remain genuinely concealed.
 
Moisture deserves attention before flooring, decorating or energy upgrades. If there is an active source, improving finishes first can mean doing them twice. Ask whether the proposed energy measures alter ventilation or make any existing condensation issue more visible. The answer should affect the work order, not just the contingency.
 
Also request an exclusions page, not merely a scope page. Waste removal, making good after electrical or plumbing access, temporary protection, testing, decoration behind removed units and floor preparation can otherwise sit between trades. Each contractor should say who owns those tasks.
 
Targeted opening-up can be worthwhile, but a survey cannot guarantee the absence of hidden defects. Agree the locations and reinstatement cost first, and concentrate on places where the result could change the design or sequence. Opening a wall just to confirm a low-cost uncertainty may create more work than it removes.
 
One detail needs clarifying: what does “coastal home” mean in Birmingham? If it describes the design rather than actual exposure, don’t let contractors add vague coastal-risk allowances. If it refers to known moisture or corrosion conditions, ask for evidence of the affected areas and a specific remedy. Either way, avoid paying for an undefined label.
 
For tender comparison, issue the same room-by-room scope to everyone and require separate figures for kitchen, bathrooms, electrical work, plumbing access, flooring preparation, decoration and energy upgrades. Add proposed start order, dependencies, lead-time items and assumptions about approvals. The cheapest total is hard to interpret if one contractor includes making good and another excludes it.
 
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