- Most unexpected cost comes from conditions nobody could see and requirements nobody asked about early.
- Contingency is for the unknown. Allowances are for the undecided. They are not the same thing.
- Scope added mid-project costs more than the same scope added during design.
- A change-order process that prices, explains and gets approval before work proceeds is the owner's main control.
Where the surprises come from
A budget surprise rarely comes from nowhere. Unexpected cost on commercial projects comes from a short and repeatable list of sources. Some are physically hidden until demolition. Some are requirements nobody asked about during design. Some are decisions the owner made late. Knowing the list lets you ask about each item in pre-construction, when it is cheap to find out.
Below is that list, then the two tools that absorb what is left, contingency and allowances, and the process that keeps control over the rest. For a specific project, the pre-construction phase is where each of these is investigated before a number is committed.
Existing conditions: behind walls and under slabs
In a second-generation space, the drawings the landlord has on file rarely match what is actually in the building. Previous tenants moved walls and plumbing. Ceilings hide ductwork, wiring and abandoned equipment. Slabs cover drain lines that may not be where anyone thinks, or may be in poor condition.
Each of these becomes a cost when it is found during demolition, because the trades are already mobilized and the schedule is already running. The way to reduce the surprise is to investigate before pricing: a thorough site walk with the trades, opening a few ceiling tiles and wall sections where the landlord allows it, scanning or coring the slab where new plumbing is planned, and a camera inspection of existing sewer lines in a restaurant. Our commercial renovations work begins with this kind of look.
Utility capacity and code upgrades
A restaurant, a dental office or a surgery center needs far more electrical, gas, water and sewer capacity than the retail or office tenant that was there before. If the building's service is too small, the upgrade may involve the utility company, the landlord and new equipment that was in nobody's drawings. The utility's own timeline and fees are outside the contractor's control, which is why utility capacity is checked before the lease is signed, not after.
Code upgrades are the other common trigger. A change of use or a project above a certain size can require the building to be brought up to current standards in areas the owner did not plan to touch: accessibility of restrooms, entrances and parking, fire alarm or sprinkler coverage, energy requirements for lighting and mechanical systems. Which upgrades apply depends on the city, the building and the project. Ask the city and the architect early.
Restaurants add their own list. Commercial kitchens require a grease interceptor, and if the building does not have one, or has one that is undersized, installing it means excavation and plumbing work that can be substantial. Hood and exhaust systems need a path to the roof and make-up air. The health authority's review may require changes to finishes and layout that the prototype did not anticipate.
The landlord's requirements
The lease and the landlord's rules carry costs that are easy to overlook. Landlords often require the tenant to use specific contractors for roof penetrations, fire alarm or sprinkler work. They may restrict work to certain hours, charge fees for construction management or utilities during construction, or require the tenant to restore parts of the premises. The work letter may promise a shell in one condition and deliver it in another.
Read the lease with the contractor before it is signed. Every landlord requirement has a cost, and the time to negotiate who pays is before the signatures.
Equipment, added scope and compressed schedules
Long-lead equipment causes surprises in two ways: prices that rise between the estimate and a delayed order, and late deliveries that force the trades to work around the missing item and come back, paying for the labor twice. The remedy is to order from approved submittals during design.
Scope added mid-project is the surprise owners most often cause themselves. A larger patio, a different finish, one more treatment room, a change to the kitchen line after the rough-in is done. Every one of these costs more in construction than it would have in design, because work is undone, trades are rescheduled and the permit may need revision. The decision is the owner's to make. The cost should be known before it is made.
Schedule compression is the quiet one. When an opening date is fixed and the schedule slips for any reason, the only way to recover is overtime, extra crews and expedited shipping, all of which cost more than the same work at a normal pace. A realistic schedule set in pre-construction, with the owner's dates reviewed against it, is the protection.
Permit and impact fees
Cities charge for plan review, permits and inspections. Some charge impact fees when a project increases demand on roads, water or sewer, and these can be significant for a new building or a change of use that adds load. Utility companies charge for new or upgraded service and for meters.
These fees are set by the jurisdiction and the utility, not by the contractor, and they vary from city to city across Dallas-Fort Worth. They belong in the budget from the start, with a line for each, and the estimate should state whether they are included or carried by the owner. A fee that appears for the first time at permit issuance is a surprise only because nobody listed it.
How contingency and allowances work
A contingency is a sum set aside for conditions unknown at the time of the estimate: what is behind the walls, what the city asks for in review, what the utility says. It is not a slush fund and it is not profit. It is drawn down with the owner's knowledge as unknowns become known, and whatever remains at the end belongs to the owner. The size of the contingency should reflect how much is actually unknown: higher for an older second-generation space with no as-builts, lower for a new shell with complete drawings.
An allowance is different. It is a placeholder for an item the owner has not yet selected, such as flooring, lighting fixtures or hardware. The estimate carries a stated amount, and when the item is chosen, the actual cost replaces it. If the owner chooses above the allowance, the difference is added. Below it, the difference is credited.
Allowances deserve attention when comparing bids, because a low allowance makes a bid look cheaper while moving cost to later. Ask what each allowance is based on and whether it reflects the quality level you intend. A contractor providing construction management should track both contingency and allowances in every report, so the owner always knows how much is committed and how much remains.
A change-order process that keeps control
Every project will have changes. Control comes from the process. A change order should be identified as soon as the condition or the request is known, priced with a breakdown of labor, material and subcontractor cost, explained in plain language with the reason, and presented to the owner for written approval before the work proceeds. The contractor should also state the effect on the schedule, because a change that adds no cost may still add days.
A running log of all changes, approved, pending and rejected, should be part of every progress report. The owner should never learn of a change from an invoice. When a change is urgent and the work must proceed to keep the schedule, the owner should be told the same day, with a price to follow within an agreed time.
Thorough pre-construction, an honest contingency, clearly based allowances and a disciplined change-order process do not eliminate surprises. They turn most of them into decisions the owner makes with full information. If you would like your project reviewed that way before the budget is set, contact Harrison Construction.
Questions owners ask
How big should my contingency be?
It depends on how much is unknown. A second-generation space with no reliable drawings and a change of use carries more unknowns than a new shell with a complete design. The contractor should propose a contingency with reasons, and the owner should understand what it covers and how it is drawn down.
Is a change order a sign that the contractor underbid?
Not by itself. Changes come from hidden conditions, city comments, landlord requirements and owner decisions, none of which the contractor controls. A pattern of changes for items that should have been in the drawings, or a markup that was not disclosed, is a different matter and worth a direct conversation.
Who pays for a code upgrade the city requires?
It depends on the lease. Many leases make the tenant responsible for all work triggered by their use, while some landlords take on building-wide items such as accessibility of common areas or fire systems. Read the lease with the contractor before signing and negotiate the items that are foreseeable.
Can I reduce surprises by getting more bids?
More bids do not reduce unknowns. Investigation does. A thorough pre-construction phase, with a site walk, utility checks, a lease review and early conversations with the city, removes more surprises than any number of competing prices on the same incomplete information.
