Commercial estimating

How to Price Alternates on a Commercial Interior Refresh

By Plan to Price Estimating · October 19, 2026

A commercial interior refresh often starts with a clear base scope—remove existing carpet, install new flooring, paint the walls, and replace base. Then the client asks about carpet tile instead of LVP, an accent wall, or upgraded ceiling finishes. Those options are alternates. Pricing them as a single blended number makes it hard for the client to choose and hard for you to defend the price later.

An alternate is a separately priced option that the owner may accept or reject. In standard bidding language, the base bid is the sum for the work described in the documents. An alternate bid is the amount stated to be added to, deducted from, or that does not change the base bid if the corresponding change in the work is accepted.

This guide focuses on commercial refreshes (office suites, retail, or similar interior work) where you control the proposal. It is practical estimating advice, not legal or contract advice. Follow the specific instructions and bid form on any formal solicitation.

Separate alternates from allowances and unit prices

An alternate is a defined package of work the client can add or remove at the price you state. An allowance is a dollar placeholder carried in the bid for an item whose exact product or price is not yet known; the actual cost is adjusted later. A unit price is a rate per unit that applies if quantities change during the work.

Mixing these creates confusion. If the client might choose carpet tile instead of LVP, price it as a substitution alternate rather than burying a low allowance for flooring and hoping the difference is small. Keep each alternate’s scope, quantities, and price independent of the base.

Define the base first

Write the base scope so it stands alone as a complete, usable result. List the rooms or areas, the existing conditions you assume, the finishes included, and the work excluded. Measured quantities (net floor area, net wall area) stay distinct from purchasing quantities (cartons, gallons after waste).

On a commercial refresh, note access limits, occupied-space rules, protection requirements, and disposal. These affect labor even if they do not change the finish square footage.

Price each alternate as its own scope

Build a separate quantity takeoff for the alternate. Identify every item the alternate adds, removes, or replaces—including related work such as transitions, substrate preparation, or masking. Request or apply separate material and labor pricing for that scope.

Include direct costs plus any real impacts on supervision, protection, cleanup, or schedule. A deduct alternate rarely returns the full value of the removed work because setup, coordination, and minimum charges often remain. An add alternate can increase those same items.

Apply your markup consistently to the alternate’s own cost basis. Markup (a percentage added to cost) is not the same as margin (the percentage of the selling price that is markup). Document the calculation so you can review it.

Present the choices clearly

In the customer-facing proposal, show the base selling price first, then each alternate as a distinct add or deduct with a short description of what it includes and excludes. Keep your internal cost breakdown (quantities, unit costs, markup) in a separate document. The client sees the options and the resulting price; you keep the working numbers for your review.

Our bid-ready package can organize an internal estimate and a branded proposal this way. If the project includes alternates, ask for them to be presented distinctly so the client can compare.

Hypothetical example: office refresh flooring substitution

This is an estimating illustration only. It is not a quote, a recommended product, or a complete bid. Assume a vacant 300-square-foot office with a sound concrete slab, 9-foot walls, and normal working-hour access—similar to the conditions in our public office sample.

Base scope (illustrative):

• Remove existing carpet and base.
• Install LVP over the measured 300 SF floor (purchasing quantity after 10% waste: 330 SF).
• Prime and paint walls (net area after openings) and paint the ceiling.
• Install new cove base and one doorway transition.

Direct costs for the base are calculated from measured quantities, waste, labor hours, and material prices. For illustration, assume a base selling price of $5,754 before tax. This figure is hypothetical; it has not been reconciled to the public sample package.

Alternate 1 — Substitute carpet tile for LVP (deductive):

• Replace the LVP material and installation with carpet tile over the same 300 SF.
• Adjust base and transition as needed for the new flooring.
• Keep wall and ceiling painting unchanged.

Illustrative direct-cost difference: LVP installed cost higher than carpet tile by $1.25 per SF on the 300 SF area = $375 less material and labor. Related transition adjustment adds $45. Net direct-cost reduction ≈ $330. If the estimator applies a combined illustrative adjustment factor of about 27.3% to the $330 direct-cost reduction, the deduct rounds to approximately $420. This factor is an example only, not a recommended markup or a verified rate from the sample package. In a real estimate, recalculate the change using the project’s actual cost and pricing method.

The proposal line would read: Alternate 1: Substitute carpet tile for LVP in the office. Deduct $420. Includes carpet tile supply and installation, adjusted base, and transition. Excludes changes to walls or ceiling.

All numbers above are hypothetical and rounded for illustration. Recalculate with your actual supplier quotes, production rates, and markup before using them.

Commercial refresh alternate checklist

• Confirm the base scope is complete and usable without any alternate.
• List each alternate with a clear description of what is added, removed, or substituted.
• Prepare a separate takeoff and cost build-up for every alternate.
• Identify impacts on related trades, protection, disposal, and schedule.
• Apply markup to the alternate’s own cost basis and record the calculation.
• Show base price and each alternate separately in the client proposal.
• State assumptions (existing conditions, access, product quality) and exclusions for both base and alternates.
• Keep internal costs out of the document the client receives.

Clear alternates let the client choose upgrades or cost reductions without rewriting the entire bid. They also give you a reviewable record of what each price covers.

Need help pricing a commercial refresh? If you want the base scope and alternates organized into an internal estimate and a branded proposal, request a written service quote. We review the plans or measurements you supply, confirm the deliverables, and send a formal quote before any work or payment begins. Starting prices apply only to small, clearly defined single-trade scopes; every project is quoted individually.

Related guides: How to write clear inclusions and exclusions and our commercial construction estimating overview.