Allowances vs Contingency
in Construction Estimates

Allowance Defined

An allowance is a placeholder dollar amount included in a bid for a scope that is known to exist but not yet fully specified. The classic example: a lighting fixture allowance of $25,000 on a commercial tenant improvement. The electrician knows the fixtures are in scope, the ceiling layout is drawn, the circuits are counted — but the owner hasn't picked a product yet, so the estimate carries a stated dollar figure both parties agree to.

The critical distinction is that the work will happen. An allowance isn't a hedge against risk; it's a mechanism to let bidding proceed before every selection is finalized. When the owner chooses a fixture, the contract adjusts up or down to actual cost — $22,000 means a $3,000 credit, $31,000 means the owner pays the difference.

Allowances appear most often for finishes, fixtures, hardware, and appliances during early bidding — anything where the scope boundary is clear but the product catalog is still open.

Contingency Defined

Contingency is money set aside for the unknown. Unlike an allowance, it isn't tied to any specific scope item — it absorbs variability across the whole estimate: pricing errors, unforeseen site conditions, scope gaps in the drawings, productivity variations, or any risk that may or may not materialize.

Its size is directly proportional to how much you don't know yet. A schematic-level budget carries substantial contingency because the design isn't resolved. A detailed hard-bid estimate from fully coordinated construction documents carries far less. Contingency isn't a permanent safety cushion; it should shrink as information improves.

When a risk occurs — an unexpected rock layer, a scope item missing from the documents — contingency absorbs it. At project close, any unspent amount is reconciled per contract terms. In many agreements, unused contractor contingency reverts to the owner.

Owner vs Contractor Contingency

One of the most common budgeting errors is treating owner contingency and contractor contingency as interchangeable. They serve different parties and cover different risks — double-counting them quietly erodes every project budget.

Owner's contingency covers decisions the owner controls: scope additions, program changes, value-engineering swaps, or the inevitable "while we're at it" items that surface during construction. It sits in the owner's budget, not the contractor's price, and is managed by the owner or their project manager.

Contractor's contingency covers the contractor's own pricing and execution risk — quantity uncertainty, subcontractor gaps, productivity assumptions that don't hold. It lives inside the contractor's number. Design contingency, a third category, covers scope evolution during design and shrinks as drawings advance from schematic through construction documents.

Typical Percentages

Contingency scales with project definition. The AACE International estimate class system is the standard guide: a Class 5 conceptual estimate carries 15–25% contingency to reflect its wide accuracy range; a Class 1 check estimate from fully detailed drawings carries 3–5%.

Earthwork preliminary estimates commonly add 10–15% contingency for quantity uncertainty — subsurface conditions are unpredictable until borings are analyzed. Allowances, by contrast, are always item-specific dollar figures. There is no "standard allowance percentage"; the number is whatever the estimator and owner agree is a reasonable placeholder.

How They Appear in a Bid

In a well-structured bid, allowances and contingency appear as clearly labeled, separate line items. When a GC buries allowances in a lump sum with no disclosure, the owner can't evaluate what they're buying and disputes arise when selections exceed the unstated figure.

Allowances are listed individually, each with a stated dollar value the GC must include. The bid form often specifies them explicitly: "Include a $15,000 allowance for finish hardware per spec section 08 71 00." Every bidder uses the same number, keeping the comparison apples-to-apples. When selections finalize, a change order adjusts the contract to actual cost.

Contingency appears as a single line item or percentage on the estimate subtotal. On GMP projects it may sit in the schedule of values so the owner can watch it draw down; on lump-sum hard bids it's often folded into markup.

• Allowances: one line per item, stated dollar value, reconciled to actual at selection
• Contingency: single line or markup percentage on estimate subtotal
• Unused contingency: disposition governed by contract — may revert to owner
• Clear labeling prevents disputes over what the bid already covers

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