Concrete grinding and polishing restores a worn, stained or uneven commercial floor by mechanically removing the damaged top layer and then either sealing the surface or polishing it to the finish you want. Grinding takes off old coatings, glue, stains and built-up markings and exposes sound concrete. From there the floor can be sealed with a penetrating sealer, a polyurethane, an epoxy or a decorative flake system, or ground progressively finer to a polished shine. The right choice depends on what the floor has to cope with: forklifts, foot traffic, moisture, chemicals, spills or how it needs to look. Because grinding concrete can release respirable crystalline silica, the work also comes with specific safety obligations in NSW.

This guide is for facilities managers, warehouse and operations managers, and building owners in Sydney weighing up whether to restore an existing concrete floor rather than cover or replace it.

What is the difference between grinding, sealing and polishing?

The three terms are often used interchangeably, but they describe different steps.

Grinding is the preparation. A heavy floor grinder with diamond tooling cuts back the surface of the concrete. It removes old sealers and coatings, adhesive residue, ingrained stains, surface damage and built-up line markings, and it can flatten minor unevenness. What is left is clean, open concrete.

Sealing protects that concrete. Concrete is porous, and unprotected concrete absorbs oil, liquids and dirt, leaving stains that cannot be cleaned out. A sealer either soaks into the concrete or forms a coating on top of it.

Polishing refines the surface itself. The floor is ground with progressively finer diamond tooling until it develops a smooth, reflective finish. The level of shine can range from a low sheen to a high gloss. Polished concrete is usually also treated to help protect it.

Royce Cleaning grinds back and seals concrete floors, re-polishes older polished concrete that has lost its shine, and polishes terrazzo, marble and natural stone floors.

Which concrete floor finish suits which commercial space?

Each sealer type has its own strengths and trade-offs. Royce’s concrete grinding and polishing service works with the main options:

Acrylic sealers form a thin coating on the surface. They provide some protection and are the budget option, but they are not as long-lasting as the other choices.
Penetrating sealers soak into the pores of the concrete and form a protective barrier against moisture while leaving a matte, natural finish. They suit floors where a natural look matters.
Polyurethane sealers form a coating that helps protect against scuff marks and staining. They can be used indoors or outdoors, including on stamped and stained concrete, and the finish can range from low sheen to high gloss depending on the number of coats.
Epoxy resins create a highly protective film on the surface and are used indoors. They are well suited to workshops, laboratories, commercial kitchens and cool rooms. Epoxy takes longer to apply, and because it forms a barrier it traps moisture in the concrete, which needs to be considered for slabs with moisture issues.
Flake flooring is an epoxy system with decorative coloured flakes, finished with a polyurethane topcoat. It is often chosen for high-traffic areas and garages, and where a floor needs more grip underfoot.

As a rough guide to matching finish to space:

Warehouses and workshops usually need a hard-wearing, easy-to-clean surface that copes with forklifts, pallets and spills. Epoxy and durable coatings are common choices, along with sealed or polished concrete in lighter-duty areas.
Retail floors and showrooms often favour polished concrete or a polyurethane finish for appearance, with slip resistance as a key consideration.
Office foyers and corridors may suit polished concrete or a restored terrazzo or stone floor.
Commercial kitchens and cool rooms need a surface that resists moisture and is easy to clean thoroughly, which is why epoxy is often used.

What does a concrete floor restoration involve?

Every floor is different, but most commercial concrete restoration jobs follow a similar sequence.

Site assessment. The contractor inspects the floor, checks its condition, previous coatings, cracks and moisture, and talks through how the space is used and what finish you want.
Preparation and protection. The work area is cleared and isolated. Walls, doors, fixed equipment and adjoining areas are protected, and dust controls are set up.
The floor is ground back to remove coatings, residue, stains and old markings, usually in several passes.
Cracks, joints and surface defects are filled or repaired so the finish goes onto a sound base.
Sealing or polishing. The chosen sealer or coating is applied, or the floor is ground through progressively finer tooling to the required level of polish.
The floor is left to cure for the time the product requires, with the area kept closed to traffic.
Clean-up and handover. The site is cleaned, protection is removed, and you receive care instructions for the finish.

Polished concrete is common in retail fit-outs, and our guide to cleaning strategies for retail environments covers how those floors are looked after day to day in a trading store.

How slippery is polished or sealed concrete?

It depends on the finish, the treatment and what ends up on the floor. A highly polished or glossy coated floor can be slippery when it is wet or contaminated with oil, dust or food. That matters for entrances, ramps, wet areas, kitchens and anywhere spills are likely.

Slip resistance should be part of the conversation from the start, not an afterthought. The questions to ask are where the floor is, what is likely to get onto it, and who walks on it. Options include a lower level of polish in higher-risk areas, slip-resistant additives in coatings, a textured system such as flake flooring, and good entry matting to stop water and grit being carried in. Maintenance matters too: a floor that is kept clean and dry is a safer floor whatever its finish.

Is concrete grinding dust dangerous?

It can be. Many concrete and masonry products contain crystalline silica. Grinding, cutting or polishing them can release respirable crystalline silica, a fine dust that can cause serious lung disease when it is inhaled. NSW regulates this work closely, and the obligations sit with the business doing the grinding.

Under the crystalline silica provisions of the Work Health and Safety Regulation 2025 (NSW), a business that processes a crystalline silica substance must:

Assess whether the processing is high risk. If the business cannot determine whether the work is high risk, it must treat it as high risk until it can.
Prepare a silica risk control plan before high risk processing starts, setting out the tasks, the control measures and how they will be monitored. Where the work is also high risk construction work, a safe work method statement containing the required information can be used instead.
Train workers involved in high risk processing about the risks of crystalline silica.
Provide health monitoring for workers carrying out high risk crystalline silica processing.
Register workers. Since 1 October 2025, businesses must register each worker carrying out high risk crystalline silica processing on the SafeWork NSW silica worker register within 28 days of the worker starting that work.

SafeWork NSW’s codes of practice on managing the risks of respirable crystalline silica, and on working safely when cutting, drilling and grinding concrete and masonry products, describe the controls expected. These typically include dust suppression with water, on-tool dust extraction, and appropriate respiratory protection.

What this means for you as the site. Ask your contractor how they will control dust, and ask to see the silica risk control plan or safe work method statement for the job. Plan the work so that the area being ground is isolated from staff and visitors, and agree on how the area will be cleaned up afterwards.

What does the site need to provide?

Concrete grinding is heavy work with heavy equipment, and a little preparation on the site’s side makes the job faster and cleaner.

Royce’s grinding equipment needs three-phase power. If the site does not have it available, Royce can bring generators.
A clear floor. Racking, stock, furniture and equipment need to be moved out of the work area, or the work planned around fixed items.
Access and timing. Grinding is noisy and the area cannot be used while the work is under way. Many sites schedule it after hours, on weekends or during a shutdown.
Information about the floor. The age of the slab, previous coatings, known moisture problems, cracks, and whether there is any in-floor heating or services close to the surface.
Time before traffic returns. Sealers and coatings need time to cure before foot traffic, and longer before forklifts or heavy loads. The contractor should specify this for the product being used.

How do you maintain a polished or sealed concrete floor?

A restored floor stays looking good for longer with the right routine care.

Remove grit daily. Dust mopping or sweeping stops grit acting like sandpaper on the finish.
Use the right cleaner. Harsh or acidic products can damage some sealers and dull polished surfaces. Use products suited to the finish.
Clean up spills quickly, particularly oils, chemicals and acidic liquids.
Use entry matting to keep water and grit off the floor at doors.
Protect against damage. Felt pads under furniture, and care with pallets and dragged loads.
Plan periodic maintenance. Coated floors may need a fresh topcoat over time, and polished floors can be re-polished when the shine fades.

For warehouse and industrial floors, routine machine sweeping and scrubbing are part of the same picture. Royce’s industrial cleaning services cover this, and our article on how industrial floor cleaning contributes to workplace safety explains why it matters.

Should you restore a concrete floor or replace the floor covering?

If your concrete is structurally sound, restoring it is often worth considering before you lay a new floor covering over it. Grinding and sealing or polishing works with the slab you already have, and a hard concrete finish can stand up well to heavy traffic.

Restoration is less suitable where the slab has significant structural cracking, serious moisture problems, or damage that goes well below the surface. In those cases, the floor may need repair before any finish is applied, and the contractor should say so at the quoting stage rather than after the grinder has started.

If the floor needs marking once it is finished, such as warehouse walkways, forklift zones or car park bays, plan the line marking at the same time so it goes onto the new surface as soon as the finish has cured.

What should a concrete grinding and polishing quote include?

Floor restoration quotes vary a lot in what they cover, so check that each one answers the same questions:

The area. The floor area to be treated, and any areas excluded.
Whether removing old coatings, adhesive or raised line markings is included, and how many grinding passes are allowed for.
Whether crack and joint repairs are included or priced separately once the floor is exposed.
The finish. The specific sealer, coating or level of polish, the number of coats, and what it is suited to.
Slip resistance. How the finish will be made suitable for the areas where slipping is a risk.
Dust control and safety. How dust will be controlled, and confirmation that a silica risk control plan or safe work method statement will be prepared where the work is high risk.
Site requirements. Power, access, working hours, and who moves furniture, racking or stock.
Curing and return to service. When foot traffic, vehicles and heavy loads can return.
Care instructions and any recommended maintenance schedule.

Frequently asked questions

Can old polished concrete be restored?

Usually, yes. Older polished concrete that has lost its shine can often be re-polished to bring it back. If the surface has deep scratches or damage, it may need to be ground back further first.

Do you polish terrazzo, marble and stone floors?

Yes. Royce polishes terrazzo, marble and natural stone floors as well as concrete.

How long before a sealed floor can be used again?

It depends on the sealer or coating, the temperature and humidity, and what the floor will carry. Foot traffic can usually return before vehicles or heavy loads. Your contractor should give you specific times for the product being used.

Is concrete grinding dusty?

Grinding concrete can generate fine dust, including respirable crystalline silica. Dust control methods such as water suppression and on-tool extraction are used to control it, and in NSW the contractor must assess the risk and, for high risk work, prepare a silica risk control plan or safe work method statement before work starts.

Does concrete grinding need three-phase power?

Royce’s equipment requires three-phase power. If your site does not have it available, Royce can bring generators.

Get a concrete floor assessment

If you have a worn, stained or uneven concrete floor, or a polished floor that has lost its shine, request a quote from Royce Cleaning. We will look at the slab, talk through how the space is used, and recommend a finish that suits your traffic, your budget and the way you want the floor to look.