What a floor sander does
A floor sander is a specialist tradesperson who sands timber flooring back to a smooth, level surface so it can be refinished. In practical terms, they remove the old coating and a very thin layer of timber to get rid of scratches, stains, wear marks, small surface imperfections, and uneven finish.
Their work usually includes:
- inspecting the floor to see whether it is suitable for sanding - checking for loose boards, nail heads, squeaks, or damaged sections - sanding the floor with heavy-duty machines in several stages - edging and detail sanding around skirting boards, corners, and hard-to-reach areas - filling gaps, nail holes, or minor defects where appropriate - preparing the surface for staining, oiling, waxing, or polyurethane coating - sometimes applying the final finish, or working alongside a separate coating specialist
In a NZ home, this is most commonly done on old rimu, mataī, tawa, oak, or other timber floors in villas, bungalows, and older homes. In newer houses, a floor sander may be called in for engineered timber floors only if the wear layer is thick enough to allow sanding.
The jobs homeowners hire a floor sander for
Most people do not call a floor sander for one reason only. The trade is usually hired when the floor needs restoration, not just cleaning.
Common reasons include:
- **Refinishing worn timber floors**: The top coat is scratched, dull, yellowed, or patchy. - **Removing old coatings**: Paint, varnish, stain, or polyurethane may need to be stripped back. - **Preparing for a new colour or finish**: Homeowners may want a lighter look, darker stain, or different sheen. - **Fixing surface damage**: Minor burns, pet scratches, scuffs, and water marks can often be sanded out. - **Matching rooms after alterations**: New or repaired sections may be sanded so they blend with the rest of the house. - **Refreshing floors before sale or renovation**: A tidy timber floor can make a major difference to presentation.
A floor sander is often booked as part of a wider renovation programme, especially if painters, builders, or carpet layers are working in the home. In NZ, it is sensible to schedule sanding late in the project, after messy building work is finished but before final painting touch-ups and furniture move-in.
What the sanding process involves
Most sanding jobs follow a similar sequence, though the exact method depends on the timber, the condition of the floor, and the chosen finish.
| Stage | What happens | Why it matters | |---|---|---| | Inspection | The tradesperson assesses the timber, existing coating, damage, and floor height | Helps determine whether the floor can be sanded safely | | Repairs | Loose boards, protruding nails, or damaged sections are fixed | Prevents machine damage and improves the final result | | Coarse sanding | The first pass removes old finish and levels the surface | Strips back wear and major marks | | Intermediate sanding | Medium grit smooths out scratches from the first pass | Prepares the timber for a fine finish | | Edge sanding | Edges, corners, and tricky areas are blended in | Stops visible bands around the room | | Fine sanding | Final smoothing before coating | Creates a clean, even surface | | Filling and clean-up | Gaps or holes may be filled; dust is removed thoroughly | Improves appearance and coating adhesion | | Finishing | Oil, stain, wax, or polyurethane is applied if included | Protects the timber and sets the final look |
A good floor sander will explain how much timber will be removed. That matters because timber floors only have a limited number of sandings in them, especially if they are already thin, uneven, or previously sanded many times.
What a floor sander does not do
It is easy to confuse a floor sander with other trades. While some businesses offer a broader floor restoration service, sanding itself is a specialist skill.
A floor sander usually does **not**:
- install new flooring from scratch - carry out major structural repairs to joists, bearers, or subfloors - remove asbestos-containing materials - rewire, replumb, or carry out regulated trade work - demolish entire rooms or undertake full building alterations
If the floor has serious structural issues, rot, moisture damage, or significant movement, a builder or floor installer may need to fix the base first. If there is evidence of damp or leaks, those issues should be resolved before sanding, otherwise the finish may fail.
How a floor sander differs from related trades
The flooring sector overlaps with a few other trades, but the responsibilities are different.
Floor sander vs floor installer
A floor installer lays new timber, engineered timber, laminate, or other flooring systems. A floor sander restores existing timber flooring. If your floor is solid timber and needs rejuvenating, a sander is the right trade. If you want new flooring laid, you need an installer.
Floor sander vs floor polisher
A polisher may clean, buff, or maintain hard floors. Sanding is more aggressive and removes material. A floor sander handles worn or damaged timber surfaces; a floor polisher is more often used for ongoing maintenance on coated floors, commercial spaces, or hard flooring that does not need material removal.
Floor sander vs carpenter or builder
Carpenters and builders can repair timber floors, replace boards, and fix structural issues. Some may also sand floors, but not all do. If you need loose tongue-and-groove boards secured, rotten sections cut out, or subfloor work completed, a carpenter or builder may be needed before the sander starts.
Floor sander vs painter and decorator
Painters and decorators may prepare or finish surfaces, but they do not normally sand timber floors as a primary trade. A floor sander prepares the wood itself; a painter may help with adjacent skirting boards, architraves, or trim after the sanding is complete.
Floor sander vs tiler or carpet layer
These trades usually come in when the existing floor is being covered, not restored. If you are ripping out carpet to reveal timber, a floor sander may be the next person on site. If the timber is being replaced with carpet, tiles, or vinyl, sanding is not needed.
When you should hire a floor sander
Hiring a floor sander makes sense when the timber is sound and you want to keep it.
Good candidates for sanding include floors that are:
- solid timber rather than thin decorative veneer - structurally sound with no major rot or movement - scratched, faded, or stained but still serviceable - old and patchy after years of use - covered in an outdated coating that needs removal
You may need advice before booking if the floor is:
- engineered timber with a thin wear layer - warped, cupped, or badly gapped - heavily water-damaged - previously painted with unknown products - located in a wet area where timber is not suitable
A reputable tradesperson will tell you if sanding is not the right solution. That honesty is worth far more than a cheap quote.
What affects the cost in New Zealand
Floor sanding prices vary depending on room size, floor condition, finish type, and access. In NZ, it is common for trades to quote per square metre or as a project price.
Key pricing factors include:
- total floor area in square metres - number of rooms and how much edging/detail work is needed - whether repairs or board replacement are included - choice of finish, such as oil or polyurethane - whether staining is required - how much furniture moving or site preparation is needed - travel costs if you are outside a main centre
As a rough guide, the final cost can move significantly depending on complexity. For example, a simple sand-and-seal job on a straightforward living area may cost much less than a floor with extensive patching, stairs, multiple coats, and premium finishing products.
For best value, get at least three written quotes and compare not only price but also:
- what preparation is included - whether dust extraction is used - number of sanding stages - type and brand of finish - drying times and recoat schedule - warranty or workmanship guarantees
What to check before hiring
Floor sanding may not be a licensed trade in the same way as electrical work, gasfitting, plumbing, or drainlaying, but that does not mean you should hire blindly. Good checking still matters.
Before hiring, ask for:
- proof of trading history and recent floor sanding experience - references or photos of completed NZ jobs - a written scope of work - confirmation of insurance, including public liability cover - details of dust control and clean-up - clarification on who supplies the coating products - a start date, project duration, and curing time before furniture can return
If the job also involves electrical alterations, plumbing changes, gas work, or building work that needs consent, the relevant regulated trades or council approvals must be arranged separately. A floor sander should not be assumed to cover that work.
What good preparation looks like
You can help the job go smoothly by preparing the home before the sander arrives.
Usually this means:
- removing all furniture, rugs, and loose items from the area - arranging access to power and water if needed - making sure pets and children stay clear during work - discussing where dust will be contained - checking that skirting boards and architraves are protected - confirming whether door trimming will be needed after sanding
In many NZ homes, especially older villas and bungalows, doors may need minor adjustments because sanding and refinishing can slightly change floor height or the profile near thresholds.
Seasonal and NZ-specific considerations
New Zealand conditions can affect how floor sanding is scheduled and finished.
- **Humidity and temperature:** Coatings cure differently in humid coastal areas than in drier inland regions. - **Winter:** Cold, damp conditions can extend drying times, especially for oil-based finishes and some sealers. - **Summer:** Warmer weather can speed up drying but also increases dust control challenges if windows are open. - **Older homes:** Character houses may have uneven floors, repairs from previous renovations, or timber species that need a gentle approach.
If you are in a coastal area, salt-laden air and humidity can influence maintenance and product choice. A good sander will recommend finishes suited to the local environment and your household use.
How to judge whether they are the right trade for the job
A floor sander is the right person if your main goal is to restore the look and life of existing timber flooring. They are not the right person if you need structural repairs, new flooring installation, or regulated trade work.
Use this simple rule:
- **Want to keep the timber floor and improve its surface?** Call a floor sander. - **Need new boards, major repairs, or layout changes?** Start with a builder or carpenter. - **Need the floor installed in the first place?** Hire a flooring installer. - **Need maintenance only?** A floor polisher or cleaning specialist may be enough.
The best floor sanding results usually come from clear planning. Know what your floor is made of, what condition it is in, and what finish you want before asking for quotes. That makes it easier to compare trades fairly and avoid surprises.
The bottom line
A floor sander restores timber floors by sanding away the worn surface, correcting minor imperfections, and preparing the wood for a new protective finish. In New Zealand homes, they are commonly hired for renovation projects, pre-sale upgrades, and repairs to tired old timber floors.
If you are thinking about sanding, focus on three things: whether the floor is suitable, what is included in the quote, and whether the tradesperson has the experience to handle your floor type. Getting a few written quotes and checking references is the safest way to choose someone who will do the job properly.