How to Choose a Hardwood Flooring Contractor
Choose a contractor who checks the floor structure, subfloor, wood product, and moisture conditions before quoting installation. Compare written bids by scope, not just by price. Ask how the installer will prepare the surface, install the selected flooring, protect movement gaps, and handle problems. Verify references, insurance, and written warranty terms before paying a deposit.
Imagine you receive three hardwood bids for the same rooms. One is much cheaper, but it does not mention moisture tests, floor leveling, or what happens if the subfloor needs repair. Another includes those steps but lists extra charges without clear limits. The right choice is not simply the lowest number. It is the contractor who explains the work, documents the conditions, and makes the price and responsibilities clear.
I review flooring estimates with cost and risk in mind. A detailed inspection can reveal costs that a quick walk-through misses, while a low bid can leave key work outside the contract. Use the checks below to compare contractors on equal terms.
Choose a Hardwood Specialist, Not Just a General Installer
A qualified hardwood contractor can explain how the flooring product, subfloor, room conditions, and installation method work together. Look for a professional who inspects before promising a final price, names the materials and procedures in writing, and can show relevant project references. Requirements for licensing and insurance vary by location, so verify local rules.
Ask each candidate how often they install the specific product you plan to buy. Solid oak strip flooring and wide engineered planks may need different preparation and installation methods. A contractor should not treat every floor as a standard nail-down job.
Request proof of general liability insurance and, where applicable, workers’ compensation coverage. Check licenses or registrations with the relevant state or local agency. Ask for recent references for similar work, then ask those customers whether the crew kept the site clean, met the agreed scope, and resolved problems.
| Check | What to ask for | Why it matters |
|---|---|---|
| Relevant experience | Recent jobs with the same flooring type and installation method | Experience should match your project |
| Insurance and local credentials | Current documents and verification details | Requirements differ by location |
| References | Two or three recent customers, if available | Helps you check communication and follow-through |
| Written scope | Materials, preparation, installation, cleanup, and exclusions | Reduces surprise charges |
| Warranty | Written coverage, limits, and claim steps | Clarifies who addresses installation defects |
A polished website or a large review count is not proof of careful installation. Look for clear answers and records. If a contractor dismisses questions about moisture or substrate preparation, get another opinion.
Substrate Inspection, Moisture Testing & Subfloor Preparation
The substrate is the surface beneath the hardwood, such as a plywood subfloor or concrete slab. Before installation, the contractor should check its condition, flatness, moisture, and support. A written inspection record gives you a baseline, helps explain preparation costs, and makes it easier to compare bids fairly.
Ask the installer to identify the existing floor structure and subfloor type, note visible damage or movement, and record moisture-test locations and results. The inspection should also identify floor-height limits at doors, stairs, cabinets, and adjoining rooms. These details can affect material choice, transitions, and labor.
For wood flooring and wood subfloors, require calibrated moisture-meter readings at representative locations. A commonly used NWFA screening guideline is a moisture-content difference of no more than 4 percentage points for strip flooring and 2 points for plank flooring. These are screening limits, not a substitute for the selected product’s instructions, site conditions, or manufacturer requirements.
For concrete, ask for documented in-situ relative humidity (RH) or moisture-vapor emission rate (MVER) testing, using the method required by the flooring or adhesive manufacturer. There is no universal concrete pass level. The results must fall within the published limits for the chosen system, or the contractor must specify an approved mitigation plan.
A moisture problem needs a diagnosis, not a cover-up. Water vapor from a damp slab or an active leak can contribute to cupping, buckling, adhesive failure, or mold. A membrane does not fix active water intrusion or hydrostatic pressure. Do not approve installation until the source is addressed and the proposed system is approved by its manufacturer.
The subfloor also needs to be flat enough for the product. Common NWFA guidance is no more than 3/16 inch of variation over 10 feet, or 1/8 inch over 6 feet. Confirm the flooring manufacturer’s tolerance, since it may be tighter. High and low areas should be corrected using methods compatible with the substrate and flooring system.
Hardwood Installation Methods, Material Compatibility & Precision
The installation method is the way flooring is secured or supported: by fasteners, adhesive, or a floating assembly. The contractor should match that method to the exact product, subfloor, and site conditions. Ask for the product installation instructions and the names of any adhesive, underlayment, or moisture-control materials in the bid.
Solid hardwood is generally not installed directly over concrete. Engineered wood may be approved for concrete, but only when the product and adhesive manufacturers allow it and all required moisture conditions are met. Do not accept a generic promise that “engineered wood works on any slab.”
Ask the contractor to state whether the floor will be nailed, stapled, glued, or floated. Then check that the selected method is permitted for your flooring and substrate. An unapproved adhesive, primer, vapor barrier, or underlayment can create performance problems and may affect product coverage.
Acclimation means allowing flooring to reach the conditions required by its manufacturer before installation. It does not always mean leaving every product in the room for a fixed number of days. The contractor should follow the product’s directions and confirm that site temperature and relative humidity fall within the stated installation range.
A complete installation plan should include:
- The flooring product, species, grade, width, and thickness
- The installation method and approved fastening, adhesive, or floating system
- Subfloor preparation and how extra repairs will be priced
- The required expansion gap and compatible transitions
- How the crew will protect the finished floor and adjacent areas
For solid flooring, the perimeter expansion gap is often about 1/2 to 3/4 inch, but the product, room size, and humidity range determine the actual requirement. The gap must remain clear beneath trim. A contractor should not fasten through it or pin the floor with trim.
Structural Deflection, Transitions, Expansion Gaps & Jobsite Safety
Structural support means the framing and subfloor can support the flooring without unacceptable movement. The installer should inspect joists, panels, fasteners, damage, and movement, then document concerns. If framing appears questionable, seek an appropriate building professional’s evaluation rather than covering the issue with new flooring.
Ask how the contractor will handle loose or damaged panels, squeaks, and uneven areas. Repairs should be described before work starts, or the contract should set a clear process and rate for approved extras. Do not let the crew conceal unresolved movement or excessive out-of-flatness beneath the hardwood.
Avoid relying on a tile rule as a hardwood guarantee. L/360 is commonly cited for ceramic tile, but it is not a universal hardwood acceptance standard. Structural suitability depends on the applicable code and flooring-system requirements. The installer should explain the basis for proceeding or recommend further review when the floor feels weak or moves noticeably.
Transitions at doorways and adjoining surfaces need to allow for the product’s movement and height. A floating floor must not be pinned by trim or a transition strip. Ask how the crew will preserve movement space around the room and at fixed objects, and confirm the plan in writing.
Also ask who moves furniture, removes old flooring, handles disposal, and protects cabinets, walls, and nearby rooms. These tasks can change the total cost. A clear jobsite plan should state what is included and what you must arrange before installation.
Compare Bids, Allowances & Change Orders
A bid is useful only when you can tell what work it covers. Compare estimates by dividing the project into materials, preparation, installation, removal, disposal, and finish work. Ask contractors to list quantities, unit prices, exclusions, and the process for approving changes before work begins.
The waste factor is the extra flooring ordered to account for cuts and unusable pieces. It can vary with room shape, board length, layout, and product. Ask each contractor to state the assumed quantity and explain how the order was calculated. Do not compare one estimate based on room area with another that includes a separate waste allowance.
| Bid item | Contractor A | Contractor B | What to confirm |
|---|---|---|---|
| Measured floor area | ___ sq. ft. | ___ sq. ft. | Same rooms and measurement method |
| Flooring ordered | ___ sq. ft. | ___ sq. ft. | Waste allowance and return policy |
| Subfloor preparation | Included / excluded | Included / excluded | Flatness work, repairs, and unit rates |
| Moisture testing | Method and cost | Method and cost | Required test and written results |
| Removal and disposal | Included / excluded | Included / excluded | Existing flooring and debris |
| Installation labor | Total or per sq. ft. | Total or per sq. ft. | Method and included details |
| Change orders | Written process | Written process | Approval required before extra work |
A low base price can become expensive if floor leveling, removal, or disposal is excluded. Ask for unit prices for foreseeable work, such as replacing damaged subfloor panels or correcting high and low areas. If the contractor cannot inspect a hidden condition before removal, the contract should explain how the crew will document it and get approval for added work.
Use this simple comparison: total expected cost equals the written bid plus likely, clearly priced extra work. Do not treat an allowance as a fixed price. An allowance is a placeholder amount, and the contract should state how the final charge is calculated if actual costs differ.
Illustrative Contractor-Selection Scenarios
These scenarios are examples, not reports of specific completed jobs. They show how inspection details can change a decision. The useful lesson is to compare documented plans and risk controls, not just the first total shown on a quote.
Scenario 1: A concrete slab. Two bids offer engineered wood. One names a product but does not include concrete testing. The other specifies the manufacturer-approved moisture test and says installation will proceed only if results meet the system’s published limits. The second bid gives you a clearer basis for approval and a way to address a failed test before flooring is installed.
Scenario 2: A wood subfloor with movement. A contractor notices loose panels and a soft area, records the condition, and lists repair pricing subject to your written approval. Another proposes to install over the existing surface without explaining the movement. The first plan is more transparent; the second leaves the source of possible problems unresolved.
In both cases, request the test results, repair scope, and product instructions before signing. A written pause point is valuable: the crew should stop and notify you if conditions differ from the estimate, rather than performing unapproved work.
Final Checks Before Signing
The contract should identify the product and work scope, estimated schedule, payment terms, cleanup, warranty, and change-order process. Ask for a written start and completion window, while recognizing that hidden damage or failed moisture results may affect timing. Keep copies of the estimate, product documents, test records, and all approved changes.
Before paying a deposit, make sure the contractor has answered these questions:
- Who orders the flooring, and who owns unused material?
- How will moisture and flatness results be shared?
- What conditions can trigger added charges?
- Must I approve extra work in writing before it begins?
- What does the labor warranty cover, and how do I make a claim?
- What care and moisture-control instructions will I receive?
The final walkthrough should confirm that transitions and trim are secure without blocking required movement space. Ask for written care guidance and any product-specific limits. A good contractor can explain how to clean and protect the floor without making unsupported promises about its lifespan.
Frequently Asked Questions
These answers focus on the checks that most often help homeowners compare hardwood contractors. Product instructions, local rules, and site conditions can change what is suitable, so ask the installer to document how each recommendation applies to your floor.
How many contractor estimates should I get?
Get at least two or three written estimates when practical. Compare their inspection methods and full scopes, not only the totals.
What should a hardwood flooring estimate include?
It should name the flooring and installation method, list preparation and removal work, state what is excluded, and explain extra charges and payment terms.
Should a contractor test moisture before installing hardwood?
Yes. Ask for recorded readings from wood flooring and wood subfloors, or documented concrete testing with the method required by the selected system.
Can solid hardwood be installed over concrete?
Solid hardwood is generally not installed directly over concrete. Follow the flooring manufacturer’s instructions and ask about an approved alternative where needed.
Can engineered hardwood go over a concrete slab?
Sometimes. The product and adhesive manufacturers must permit the assembly, and concrete test results must meet the system’s published limits.
Is a 4-percentage-point moisture difference acceptable?
It is a commonly used screening limit for strip flooring, not a universal approval. Product instructions, climate, and site conditions govern.
What is a reasonable waste factor for hardwood?
There is no single factor for every project. Ask the contractor to show the room measurement, quantity ordered, and reason for the allowance.
Should I pay for subfloor repairs before work starts?
Agree on known repairs in the contract. For hidden damage, require photos or other records and written approval of the price before the repair begins.
What warning signs suggest I should pause?
Pause if the contractor skips required tests, will not describe the installation system, dismisses visible movement, or starts extra work without your approval.
Does trim need to leave an expansion gap?
Yes. The product’s specified perimeter space should remain clear beneath trim. Transitions and trim must not pin a floating floor.
(This article was written by one of our staff writers, Richard Bennett. Visit our Meet the Team page.)
