Who Is Responsible for the Subfloor in a Condo? Owner vs Association

The Short Answer

The subfloor in a condo is usually the association’s to repair, and the flooring on top of it is usually yours. Many declarations, and the default law in several states, draw the unit boundary at the finished or unfinished surface of the floor. Everything below that line is a common element. Your declaration can move the line, so check it first.

Why the Subfloor Is Usually a Common Element

States that adopted the Uniform Common Interest Ownership Act set a default rule for where the floor is split. Washington’s version of the act reads: “If walls, floors, or ceilings are designated as boundaries of a unit, all lath, furring, wallboard, plasterboard, plaster, paneling, tiles, wallpaper, paint, finished flooring, and any other materials constituting any part of the finished surfaces thereof are a part of the unit, and all other portions of the walls, floors, or ceilings are a part of the common elements” (RCW 64.90.210(1)(a)). Nevada’s text is the same (NRS 116.2102(1)), and so is the text of Washington’s older Condominium Act (RCW 64.34.204(1)). Under that rule, the finished flooring is yours and the subfloor is “another portion” of the floor, so it is common.

California’s default is narrower. Only “the interior surfaces of the perimeter walls, floors, ceilings, windows, doors, and outlets” are part of your separate interest, and “any other portions” are common area (Civ. Code 4185(b)).

Both rules are only defaults. They start with “Except as provided by the declaration” (Washington) or “Unless the declaration or condominium plan… otherwise provides” (California). Real declarations and policies often say the same thing in their own words:

• A Florida condo (Cypress Chase North No. 4) set the lower unit boundary at “the unfinished upper surface of the floor.” The Fourth District Court of Appeal read that to make the space between one unit’s ceiling and the upstairs unit’s floor a common element (McLlenan v. Cypress Chase North Condominium No. 4 Ass’n, No. 4D2023-1269 (Fla. 4th DCA June 5, 2024)).
• Third Laguna Hills Mutual in California defines the owner’s unit as floor coverings and other interior property “above the sub-floor” (Damage Restoration Policy, Section 2.5).

Some declarations go the other way and put the subfloor, or everything above the slab, inside the unit. Then the subfloor is your repair, except after an insured loss in Florida (see below). That is why you read your own document before you pay anyone.

Concrete Slab or Wood Frame: What “Subfloor” Means in Your Building

The word means different things in different buildings.

In a concrete building, the slab is structure, and it is almost always common. In a wood-frame building, the plywood is the layer people argue about. A soft spot, a squeak or a crack in it is usually an association repair, unless your declaration says the subfloor is part of the unit. For problems in the slab or the frame below it, see our guide to structural repairs.

Who Pays When a Leak Damages the Subfloor

If the subfloor is a common element, the association must repair it no matter where the water came from. In McLlenan, sewage from the upstairs owner’s bathtub poured into the bathroom of the unit below and broke through the light fixtures on its ceiling. The association said it had no duty to repair because the leak did not come from a common element. The court disagreed. Under that declaration, the space between the lower unit’s ceiling and the upstairs unit’s floor was a common element, and “[t]he cause of the leak was irrelevant to the association’s duty to repair.” The opinion does not mention a subfloor. The owner’s complaint was about drywall, ceilings and mold. The court sent the case back for further proceedings on facts still in dispute, including whether the damage was to common elements. Florida law says plainly that “[m]aintenance of the common elements is the responsibility of the association” (Fla. Stat. 718.113(1)).

In Florida, an insured loss goes to the association even if the subfloor is in your unit. The association’s master policy must cover “[a]ll portions of the condominium property as originally installed or replacement of like kind and quality” (Fla. Stat. 718.111(11)(f)1). The list of exclusions in (f)3 names “floor, wall, and ceiling coverings” but not the subfloor. Any part of the property the policy must cover “which is damaged by an insurable event shall be reconstructed, repaired, or replaced as necessary by the association as a common expense” (718.111(11)(j)). So after a leak the policy would cover, the association repairs the original subfloor, unless your association voted to opt out of this rule under 718.111(11)(k) and recorded a notice, in which case the declaration decides.

But the association may send the bill to whoever caused it. In McLlenan, the declaration let the association charge a negligent owner for the repair. In Florida, an owner whose “intentional conduct, negligence, or failure to comply with the terms of the declaration or the rules” caused the damage pays the repair costs “not paid by insurance proceeds” (718.111(11)(j)1). That is often the deductible. In Washington, the association can charge one unit only for willful misconduct or gross negligence, for breaking a maintenance standard that warns owners they may be liable, or for ordinary negligence if the declaration says so. It must give notice and a chance for a hearing first. The charge is limited to the association’s cost “less any insured proceeds received by the association.” Separately, if the declaration allows it, the association may charge a unit for a covered loss to that unit that falls within the master policy deductible, up to the deductible (RCW 64.90.480(6) to (8)).

Your flooring stays your cost. In Florida, the master policy must exclude “floor, wall, and ceiling coverings” inside the unit (Fla. Stat. 718.111(11)(f)3). Your HO-6 is the usual source of money for new flooring. See what HO-6 insurance covers and leaks into the unit below.

Replacing Your Floors: Approval and Sound Rules

You can usually change the finish without touching the subfloor. Washington and Nevada let an owner make improvements to the unit that do not “impair the structural integrity or mechanical” systems or “lessen the support of any portion” of the community (RCW 64.90.255(1); NRS 116.2111(1)(a)). Your governing documents can add conditions.

Cutting, replacing or leveling the subfloor is a different job. If it is a common element, you need the association’s written approval first.

Sound rules matter most when you swap carpet for a hard floor. The International Building Code requires floor-ceiling assemblies between dwelling units to have an impact insulation class (IIC) of at least 50 in lab tests, or a field rating of at least 45 (IBC 2021, Section 1206.3). That applies to new construction. Many associations set their own flooring rules on top of it, often a required underlayment or a minimum rating. Ask for the rule in writing before you buy flooring.

Who Replaces the Baseboards and Trim

If the association pulls up your floor to repair the subfloor, ask who puts the finishes back. The default statutes help you here. In Washington and Nevada, the owner must give the association access through the unit for repairs. “If damage is inflicted on the common elements or on any unit through which access is taken, the unit owner responsible for the damage, or the association if it is responsible, is liable for the prompt repair of the damage” (RCW 64.90.440(3)). Nevada’s rule is nearly word for word the same (NRS 116.3107(1)).

Your declaration may say more about restoring finishes after an association repair, so read its maintenance and insurance sections. Get the scope in writing before work starts: who removes and reinstalls flooring, baseboards and trim, and who pays for paint touch-ups.

The Back of the Drywall and “Studs Out”

The same boundary rule answers two related questions.

• The back of the drywall. Under the Washington and Nevada default, “wallboard” is listed as part of the finished surface, so the whole board is in the unit. Under California’s default, only the “interior surfaces” are. Some declarations keep drywall common: Third Laguna Hills Mutual lists “non-altered drywall” as Mutual-controlled property (Section 2.6). See drywall responsibility.
• Studs out. In a studs-out declaration, the association maintains everything from the studs outward: framing, insulation, sheathing, and the subfloor and joists under you. See unit boundaries.

Steps If Your Subfloor Is Soft, Cracked or Wet

1. Stop any water first. Shut the fixture valve or the unit valve.
2. Report it in writing to the manager the same day. Say where, what you see and when it started.
3. Find your boundary clause. Look in the declaration for “unit boundaries” and “maintenance.” Note the exact words about the floor.
4. Photograph everything before anyone removes flooring.
5. Let the association inspect before you or your installer cut, level or replace the subfloor.
6. Call your HO-6 insurer to open a claim for flooring and belongings.
7. Agree on scope in writing: who repairs the subfloor, who removes and replaces flooring and trim, and who pays.
8. If the association refuses, quote the clause and the statute back, and ask for a hearing before any charge, where your state law or documents give one. Use our repair dispute process and letter to the HOA to repair leak damage.

Frequently Asked Questions

Who is responsible for a subfloor in a condo?

Usually the association. Many declarations, and the default rule in states that adopted the Uniform Common Interest Ownership Act, make only the finished flooring part of the unit. The subfloor, joists and slab are common elements the association maintains. Your declaration can put the subfloor inside the unit, and the association can charge you if you caused the damage.

Is the subfloor a common element in a condo?

Usually yes. If the declaration designates floors as unit boundaries and says nothing more, the default statutes in states like Washington and Nevada make the finished flooring part of the unit and all other portions of the floor common elements. California's default keeps only the interior surface in the unit.

Does the HOA pay to replace the subfloor after a leak from the unit above?

Usually, if the subfloor is a common element. A Florida appeals court held the cause of the leak was irrelevant to the association's duty to repair common elements. In Florida, the association also repairs insured damage to the original subfloor even if the declaration puts it in the unit, unless the association opted out under 718.111(11)(k). The association may then charge a negligent upstairs owner for costs insurance does not pay, often the deductible, if state law or the declaration allows it.

If the condo association is replacing my floors, who takes care of the trim and baseboards?

Check your declaration first. In Washington and Nevada, an owner must give the association access for repairs, and if the association damages your unit while taking access through it to make repairs, it is liable for prompt repair of that damage. Before work starts, agree in writing who removes and reinstalls flooring, baseboards and trim, and who pays for upgrades.

Can I replace my condo subfloor myself?

Not without approval if the subfloor is a common element. You can usually change the finished flooring, subject to your association's flooring and sound rules. Cutting or replacing the subfloor changes common property, so get written approval first. In Florida, after a property loss the association does the reconstruction, and an owner may do reconstruction work on the unit only with the board's prior written consent (Fla. Stat. 718.111(11)(g)1).

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Important Disclaimer: This article describes common patterns and quotes state law as of November 2026. It is general educational information, not legal advice. Every declaration is different, and state law varies. Always read your own governing documents, and talk to your association’s manager or a qualified community association attorney about your situation.

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