What are acceptable gaps in hardwood floors?

Author: Mrs. Giovanna Conroy  |  Last update: Friday, March 27, 2026

Most flooring specialists agree that a gap of 1%-5% of the hardwood's width is acceptable and won't affect the performance of the flooring.

What is the tolerance for hardwood floors?

Tolerances are 1/8” within a 6' radius, or 3/16” within a 10' radius.

What gap for wood flooring?

Most of the time the expansion gap will be hidden beneath a skirting board or beading so it is recommended that a 15mm expansion is left. There are some circumstances where it would be preferable to have less of a gap than 15mm, but we recommended consulting with us first.

What is the spacing for hardwood floors?

A safe bet is spacing them every 4- to 6-inches and 1/2- to 1-inch away from the edge against the wall. Drive flooring nails through the pilot holes.

What can I do about large gaps in my hardwood floors?

The process is relatively simple. Fill in the gap with wood filler, leave the wood filler to dry, and wipe off the excess with a damp rag. This will fill in the gaps between your hardwood floor pieces and make your floors look a lot better!

Understanding Hardwood Floor Gaps

What is the acceptable gap in hardwood floors?

Generally speaking, gaps in a wood floor are normal for boards up to 2¼ inches wide if the gaps close during more humid times of the year. Normal gaps can vary in width, ranging from hairline gaps to the thickness of a quarter.

How to fill gaps in floorboards in Australia?

Caulk your floors to seal the gaps and cracks using Fuller Ultra Clear sealant. This is a water-based gap sealant that is white when applied and clear when dry (not invisible). You can also apply this sealant on your draughty architraves, skirting boards, and air vents.

How far apart should hardwood floor seams be?

Allow a minimum of 10 to 12 inches between end joints in adjacent rows. Apply a quality T&G glue in the top portion of the groove along the side and end joints of each plank to ensure a strong bond between them. As each plank in installed, check for and remove excess T&G glue or spills immediately.

How much does a hardwood floor expand and contract?

Solid hardwoods by far, will expand and contract more than engineered products. How much will depend on the layout involved, seasonal change in relative humidity, species selection, and type of hardwood cut. For smaller areas such as 10' x 12' rooms, leaving 3/8" expansion would be satisfactory.

Should you leave gaps between floorboards?

Gaps between floorboards act as a kind of insurance policy, a buffer zone that accommodates the wood's tendency to expand and contract. Without them, you risk a floor that ends up looking warped, uneven, or damaged over time.

How much gap should I leave for flooring?

Generally, a gap of 1/4 inch to 1/2 inch is recommended for hardwood flooring, while laminate flooring typically requires a gap of 1/4 inch to 3/8 inch. It's important to note that the expansion gap should be consistent throughout the room, including around obstacles such as doorways, cabinets, and pipes.

What is the rule of 3 flooring?

This rule says you should use three flooring types at maximum throughout the whole home. For example, you might use hardwood in public areas of the house, except the kitchen and bathroom, where you use vinyl linoleum.

Why are my new hardwood floors separating?

More specifically, you could be experiencing hardwood floor splitting because: The wood was installed in an uncontrolled environment—meaning it was outside the 35 – 55 percent relative humidity (RH) range that's used throughout the industry. The wood wasn't acclimated properly before installation.

Where not to install hardwood floors?

Bathrooms and laundry rooms are rooms where you should not install hardwood floors. Separately stands the basement, where it is not recommended to install hardwood flooring under almost any conditions. Humidity, the possibility of spills, and floods make these rooms dangerous for hardwood flooring.

What is the acceptable floor level tolerance?

Just like ceramic tile, wood and resilient flooring require a high degree of flatness that can easily be achieved using a cementitious SLu. Many manufacturers of wood flooring require that the variation in floor flatness be no more than 3/16" in 10' and 1/8" in 6'.

What is the life expectancy of hardwood floors?

Solid hardwood flooring lasts 30 to 100 years (or more), while engineered hardwood flooring can last at least 20 to 30 years. Your floor's life span depends on the type of wood, the quality of the product, how it was installed, where it is located, and whether it receives regular maintenance.

Are gaps in hardwood floors normal?

Gaps in wooden floors are normal and occur when wood loses its moisture content. Some floors have deliberate gaps for preferred aged aesthetics such as a rustic look chevron floor. Wood expands and contracts when it absorbs or releases moisture. This natural movement exists in all wooden floors.

What is the expansion gap for flooring?

An expansion gap is a small space left around the perimeter of the room. For hardwood floors it is recommended that a gap of at least 12mm is left around the entire edge of the room, including all doorways, fireplaces, and around any pipework.

What is the average labor cost for hardwood floors?

Labor costs for installing hardwood floors can vary widely. On average, you can expect to pay between $3 and $7 per square foot for labor. The final rate depends on your location, the installer's reputation, and the complexity of the project.

How much gap for hardwood flooring?

If the hardwood planks have no space to expand, they can start to lift or crack. For example, for red oak hardwood flooring, expect it to move 1/16” for every foot across the grain. That means, in a 16 ft wide by 20 ft long room, you'll need a 1-inch expansion gap, 1/2inch on each side.

How do you close gaps in hardwood floors?

The first step is to clean out any debris that may in between the gaps. Apply filler liberally with either your fingers or a putty knife, allowing for some overfill. Once the filler has dried, you can sand and complete the filling process by stain where needed.

What flooring does not need an expansion gap?

Brecon is a very popular choice for bathroom and/or kitchen flooring as it usually needs no expansion gaps, is fully waterproof flooring, and comes with a built-in underlay, so installation can be quick and efficient.

Should I leave gaps between floorboards?

Incorrect or no acclimatizing of the floor before fitting.

They will contract and expand depending on the room's conditions. They advise leaving a gap around the room of 10/15 millimetres. That way, the floor will be able to contract and expand all it likes without unsightly gaps or damage to your floor.

What is the best wood filler for floorboard gaps?

Top 3 Products for Filling Gaps in Floorboards
  • Minwax Stainable Wood Filler. Overview: Minwax is a high-performance, professional-grade wood filler. ...
  • Red Devil Onetime Patch & Prime. ...
  • Bona Pacific Filler.

Can you fill gaps in wood with silicone?

Yes – absolutely. Silicone caulk is effective for bonding and sealing wood surfaces. Its versatility ensures secure and durable adhesion and results in a long-lasting finish. Silicone caulk creates a flexible, robust barrier.

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