Renovating a commercial property often means changing how people and vehicles move around it. A new tenant wants a loading bay. A strata complex adds visitor parking. A warehouse moves its racking and needs new walkways.

Every one of those changes leaves behind old line markings that no longer make sense. Left in place, they confuse drivers and can send people into the wrong area.

Delineation Line Marking is a family-owned company that removes and alters line markings on roads, car parks, factories and warehouses across Perth and the South West of Western Australia.

This guide explains the main ways old markings are dealt with, and what property owners should think about before they start.

Why old markings cause trouble

People follow lines without thinking about it. If a faded arrow still points one way and a fresh arrow points the other, some drivers will follow the wrong one.

Ghost lines are a common problem after a rushed change. These are old markings that were painted over or partly worn away but still show up in low sun, at night or after rain. They can make a car park or driveway look like two layouts laid on top of each other.

Removing or covering old lines properly is part of the renovation, in the same way patching walls is part of a repaint.

Mechanical removal

Mechanical removal physically takes the marking off the surface. Delineation Line Marking describes using a scarifier for this work. The machine has a rotating drum or milling head with cutting teeth or flails that break up the top layer of the surface where the paint sits.

It can be used on concrete, asphalt and other pavement. Because it removes material, it leaves a slightly different texture where the line used to be.

This method suits areas where the old lines must be gone for good, such as a road or a busy entry where any leftover marking could mislead drivers.

Blackout or grey-out paint

Blackout paint covers an existing line with a dark coating that blends in with the surface. It is usually the lower cost option and can be quick to apply.

There is a catch. The company notes that old markings may still be visible under certain lighting conditions. It also says this method may not suit roads or airport runways.

For a private car park or a low speed yard, blackout paint can be a sensible choice. Where safety depends on drivers seeing only one set of lines, full removal is often the better path.

Water blasting and grinding

Abrasive methods such as water blasting and grinding are another option. According to the Delineation Line Marking site, these methods can remove the history of previous markings.

They suit surfaces where a clean result matters and where the old lines have built up over several repaints. A line marker can look at the surface and the layers of paint and suggest which method will work best.

Choosing a method for your site

There is no single right answer for every property. A few things will guide the choice.

• How the area is used, and how fast vehicles travel through it.
• What the surface is made of, such as asphalt or concrete.
• How many layers of old paint are on the surface.
• Whether the area is a private site or part of a public road.

Budget matters too. Full removal costs more than covering a line, but it can save the cost of fixing a confusing layout later.

Work on or near a public road

Some changes reach beyond the property boundary. A new driveway, a moved crossover or a change at the edge of a site can bring the work close to a public road.

In Western Australia, Main Roads WA sets out when people working in the road reserve need consent and traffic management. It also explains that anyone doing works that affect traffic or pedestrian access in the road reserve needs a current traffic management accreditation.

Local roads are handled by the local road authority, which is usually your council. Check with them early so the job is not held up waiting on paperwork.

Plan the new layout before anything is removed

It is tempting to remove the old lines first and work out the new design later. That often leads to a site with no markings at all for days, which is not safe for anyone using it.

Draw the new layout first. Walk the site with that plan. Mark up the bays, walkways, arrows and loading areas you need, and agree on them with tenants or the strata committee.

Then the removal and the new marking can happen in a single, planned visit or a short run of visits.

Replacing the markings

Once the old lines are gone, the new ones go down. The removal and alteration page lists options such as thermoplastic paint for high traffic areas, raised pavement markers, and stencils for disabled, electric vehicle and crosswalk bays.

The company also says it can redesign or rejuvenate existing markings, and it will work on markings that another business put down in the first place. That helps when you have taken over a property and do not know who did the original work.

Keep the site safe during the work

Even a small line marking job affects how people use a site. Plan where cars will park while an area is closed, and how pedestrians will get to the building.

Tell tenants, staff and visitors when the work will happen. Simple temporary signs and cones help people find their way around a closed section.

If the property is a strata complex, give residents enough notice to move their cars. A single car left in a bay can hold up an entire row.

A plain checklist for owners and managers

Before you book the work, run through these points:

• New layout drawn and agreed with tenants or the strata committee.
• Removal method discussed with the line marker for each area.
• Any road reserve or council requirements checked.
• Temporary parking and walking routes planned.
• Tenants, residents and visitors told about the dates.
• New layout recorded for future maintenance.

Changing a site layout is a normal part of owning a commercial or strata property. Dealing with the old markings properly is what makes the new layout clear and safe to use.