How GCs Should Bid the Flooring Scope

A flooring bid is one of the easier line items to get wrong, because the number on the front page rarely tells you what you are actually buying. Two flooring subs can look at the same set of plans, walk the same slab, and hand you proposals that differ by 30 percent — not because one is cheaper labor, but because they made different assumptions about substrate condition, moisture testing, transitions, and who eats the cost when the concrete comes back wet. As a general contractor, your job is not to find the lowest flooring number. It is to find the number that will still be the number when the job closes out.

That distinction matters more in a fast-growing market like Boise and the wider Treasure Valley, where tract construction and multifamily are going vertical on aggressive schedules and slabs are being poured and floored in the same season. A green slab, a dry high-desert winter, and forced-air heat are three separate ways for a flooring scope to blow its budget after the contract is signed. The bids that protect you are the ones that name those risks and price them. The bids that hurt you are the ones that stay silent and turn every silence into a change order.

This guide walks through how to read, structure, and level flooring bids so you are comparing the same work. It is written for GCs and construction managers who own the schedule and the margin, and it assumes you already know your project — you just want the flooring scope to stop being the surprise at the end.

What a Complete Flooring Bid Actually Contains

A bid you can rely on reads like a scope of work, not a price tag. At minimum it should break out, by area or room type, the material (species, product line, wear layer or thickness, and finish), the installation method (glue-down, floated, nail/staple, or thin-set), the underlayment or membrane, and the transitions, thresholds, and trim. It should state square footage by product with a defined waste factor — usually 5 to 10 percent depending on layout complexity and plank direction — so you can see whether the sub measured off the plans or guessed.

Just as important is what the bid says about the surface it is going over. Look for a stated substrate assumption: flatness tolerance, moisture condition, and the expected prep. The National Wood Flooring Association (NWFA) publishes flatness standards for wood installs — commonly 3/16 inch over 10 feet — and a real bid tells you whether the existing slab meets that or whether grinding and skim-coating are included or excluded. A proposal that lists a product and a price but never mentions flatness, moisture, or transitions is not a complete bid. It is a placeholder, and the missing pieces will come back as extras.

Allowance Pricing Versus Specified Pricing

The single biggest source of flooring bid confusion is the allowance. An allowance is a dollar figure the sub carries for material they have not actually selected — "$3.25/sq ft material allowance for LVP." It is useful early in design when the finish schedule is not locked, but it is dangerous at bid leveling because it is not a real price. If your architect later specifies a 20-mil wear layer commercial product and the allowance was built around a 12-mil residential plank, the delta is yours.

Specified pricing, by contrast, is tied to a named product with a known cost. When you compare bids, the first thing to do is separate the allowance line items from the specified ones and confirm every sub is carrying the same allowance value, or better, the same actual product. A bid that is 8 percent lower often turns out to be carrying a lower allowance, which means it is not cheaper — it is just deferring the decision. For projects where the finish is settled, push subs off allowances and onto specified SKUs. Our note on choosing builder-grade flooring materials that hold up walks through how wear layer, core type, and finish drive both durability and unit cost, which is exactly the information you need to turn a vague allowance into a defensible specified number.

Substrate Prep: The Assumption That Moves the Most Money

Nothing swings a flooring number like the condition of what is underneath. On slab-on-grade — which is most of what gets built in the valley — the two variables are flatness and moisture, and both are routinely underpriced by whoever wants to win on headline number.

Flatness gets fixed with grinding, patching, or self-leveling underlayment, and those are square-footage line items that should be visible, not buried. Moisture is the more expensive risk. Concrete gives up water for a long time, and installing an impermeable floor or a glue-down wood product over a slab that is still emitting moisture is how you get cupping, adhesive failure, and delamination months later. The industry does not guess at this — it measures. ASTM F2170 covers in-situ relative humidity testing using probes set into the slab, and ASTM F1869 covers the calcium chloride moisture vapor emission rate test. A serious bid states which test will be run, the pass/fail threshold tied to the flooring manufacturer's warranty, and — critically — who pays for mitigation if the slab fails. If the bid is silent, the default is that mitigation is excluded and you are buying a moisture barrier by change order at the worst possible time in the schedule.

For resilient flooring over concrete, ASTM F1700 (for solid vinyl tile) and the associated RFCI (Resilient Floor Covering Institute) guidance describe substrate and installation expectations that a competent sub should reference. Ask for it. The answer tells you whether they actually plan to test or just plan to install and hope.

The Idaho Spine: Dryness, Radiant Heat, and Wood Movement

High-desert winters and forced-air heat make interior air brutally dry, and wood — solid or engineered — moves with humidity. A flooring bid for a wood or engineered product should state the acclimation period and the target in-service humidity range, typically the 30 to 50 percent relative humidity band the NWFA associates with dimensional stability. In a valley home running forced air through a dry January, indoor humidity can fall well below that, and floors installed tight in the wet season open up gaps in the dry one. That is not a defect — it is physics — but a bid that never mentions acclimation or humidity control is a bid that will generate a callback and a finger-pointing conversation.

Radiant heat adds another layer. Hydronic radiant slabs are common in valley custom builds, and not every product or adhesive is rated for them. A radiant-ready bid names a maximum surface temperature (usually around 80 to 85 degrees F), a slow ramp-up protocol, and a product the manufacturer warrants over radiant. If radiant is in the plans and the bid does not address it, you are one warranty denial away from a full tear-out. Entries deserve mention too: snow, gravel, and mud at mudroom and garage transitions argue for more durable, more moisture-tolerant material at the thresholds, which is a spec decision that belongs in the bid, not an afterthought.

Common Exclusions That Become Change Orders

Read the exclusions page first — it is where the real scope lives. The recurring offenders: moisture mitigation, floor prep beyond a stated tolerance, demolition and disposal of existing flooring, subfloor repair, furniture moving, transitions to dissimilar surfaces, and stair nosings. Each is a legitimate thing to exclude if it is genuinely someone else's scope, but each is also a common place to hide a low number.

The other frequent gap is protection and sequencing. Finished floors installed too early get destroyed by trades working above them. A good bid states when the sub expects to install relative to paint, trim, and cabinets, and whether floor protection (rosin paper, board, or a temporary covering) is included. Acoustic assemblies are their own exclusion trap in multifamily — if the project needs a rated floor-ceiling assembly, the underlayment that achieves the IIC and STC ratings (tested per ASTM E492 and ASTM E90, expressed through ASTM E413) is a specified component, not a generic "underlayment included." If you are packaging flooring across a whole community, our multifamily flooring package approach shows how acoustic underlayment, unit-mix quantities, and turn-schedule logistics get priced as one scope instead of a pile of separate surprises.

Slip Resistance, Emissions, and the Codes Behind Them

For any wet or common area, slip resistance is a spec, not a preference. ANSI A326.3 defines the dynamic coefficient of friction (DCOF) test, and a bid for tile in an entry, bath, or amenity space should name the target DCOF for the intended use. On the air-quality side, wood and composite products carry formaldehyde emission limits under CARB Phase 2 and the federal TSCA Title VI rules — worth confirming on submittals, especially for multifamily where indoor air quality drives complaints. Commercial and multifamily work also lives under the International Building Code (IBC) for fire and assembly requirements, and structural concrete tolerances trace back to ACI documents. You do not need to become the flooring inspector, but naming these standards in your bid instructions forces subs to price the compliant product instead of the cheapest look-alike.

How to Level Bids Into Apples-to-Apples Numbers

Leveling is the discipline that turns three different proposals into one honest comparison. Build a simple matrix: rows for each area or product, columns for each bidder, and cells for material spec, install method, prep assumption, allowance versus specified, waste factor, and stated exclusions. Fill it in and the outliers reveal themselves — the low bid that carried a thinner wear layer, the one that excluded moisture mitigation, the one that assumed a flatter slab than you have.

Then issue a single, written scope clarification to every bidder so they re-price the same thing: same products, same waste factor, same prep responsibility, same testing standard, same protection expectation. Ask each to confirm in writing that moisture mitigation is included or to state a unit price for it. That one question converts the biggest hidden risk into a known number. When the clarifications come back, the spread usually collapses, and the bid that looked cheapest often is not. Our overview for builders and general contractors covers how we structure proposals so this leveling is straightforward rather than a forensic exercise.

The goal is not to punish the low bidder — it is to make sure the low bidder is actually low on the same work. A bid that is honest about prep, testing, exclusions, and Idaho's climate realities is worth more than one that is cheaper because it stayed quiet.

If you are scoping flooring on a Treasure Valley project and want a bid you can level against the field — specified where it should be, honest about the slab, and clear about what is included — reach out to Alderwood Flooring through our contact form. As an Idaho Registered Contractor (Idaho RCE-6681702) with 20+ years of combined experience, insured and warranty-backed, we would rather write the number that holds than the number that grows.