Do I need to prime the wall behind shelving before painting?

If the wall behind the shelving has bare plasterboard, bare timber, or significant staining, yes — you should apply a suitable primer or sealer before your topcoat. Priming ensures even paint absorption and a longer-lasting finish. If the surface is already painted and in good condition, a light sand and clean may be all that's needed before applying your topcoat.

What's the best brush for painting in very narrow gaps behind shelving?

A slim angled sash brush (25–50 mm wide) is the most versatile option for tight spaces. For extremely confined areas, a bent or flexible brush can help you reach awkward corners. A mini radiator roller on an extension handle is useful for any flat wall sections you can access. These tools are available at most NZ hardware stores including Bunnings and Mitre 10.

Can I paint over mould I find behind a wardrobe?

No — you should never simply paint over mould. Treat the affected area with a mould killer first, allow it to dry fully, then apply a mould-resistant primer before your topcoat. If the mould is extensive or you suspect it's caused by a moisture or ventilation problem in the wall, it's worth getting a professional assessment. BRANZ has helpful guidance on dealing with mould in NZ homes.

Is it worth removing a built-in wardrobe just to paint behind it?

It depends on how accessible the wall is and how fixed the unit is. If the wardrobe can be safely moved without damaging the wall or disconnecting any electrical fittings, removing it temporarily will give you much better access and a cleaner result. If it's structurally built-in or involves electrical work to remove, it's usually better to work around it using the right tools and techniques.

How do I match the paint colour behind shelving to the rest of the room?

If you still have the original paint tin, use the same product and colour. If not, take a paint chip or photo to your local Resene, Dulux, or Wattyl store — they can often colour-match from a sample. Keep in mind that paint behind shelving is rarely visible, so a close match is usually fine. If you're doing a full room repaint at the same time, simply use the same batch of paint throughout.

How to Paint Behind Built-In Shelving or Wardrobes

Painting behind built-in shelving or wardrobes is one of those jobs that looks simple until you're crouched in a dark corner with a brush that's too big and paint dripping on the carpet. The good news is that with the right approach, tools, and a bit of patience, most homeowners can tackle this themselves — or at least make a solid start before calling in a professional.

Assess What You're Working With

Before you pick up a brush, take stock of the situation. Ask yourself:

Is the unit fixed to the wall or floor? Built-in wardrobes and shelving units are often screwed into wall studs or the floor, making removal impractical.
How much of the wall is actually visible? Sometimes only a sliver of wall is exposed at the sides and top — in that case, a slim angled brush may be all you need.
What surface are you painting? Plasterboard (GIB board), timber, or a previously painted surface will each need slightly different preparation. Check GIB's technical information if you're unsure about your wall substrate.
Is there any mould or moisture damage? In NZ's often damp climate, hidden wall sections behind wardrobes can harbour mould. Address this before painting — a mould-wash treatment and appropriate primer are essential.

Preparation is Everything

Good prep makes the difference between a job that lasts and one that peels within a year.

Clear the area — Remove everything from shelves and the floor in front of the unit. Lay drop sheets to protect flooring and any fixed surfaces.
Clean the wall — Wipe down with a damp cloth and a mild sugar soap solution to remove dust, grease, and cobwebs. Allow to dry fully.
Check for mould — If you spot mould, treat it with a suitable mould killer before priming. BRANZ has useful guidance on moisture and mould in NZ homes.
Fill and sand — Fill any holes or cracks with a suitable interior filler, sand smooth once dry, and spot-prime bare areas.
Mask edges — Use painter's tape along the edges of the shelving unit, skirting boards, and any trim to keep lines clean.

Choosing the Right Paint

For walls behind shelving, a quality water-based interior wall paint is the standard choice. You don't need anything fancy — a flat or low-sheen finish is fine since these areas aren't high-traffic. Match the sheen level to the rest of the room for a consistent look if the area is partially visible.

If you're painting bare plasterboard, always apply a sealer/primer first — skipping this step leads to uneven absorption and a patchy finish. Resene, Dulux, and Wattyl all offer suitable interior primers and wall paints widely available across NZ.

The Right Tools for Tight Spaces

This is where most DIYers struggle. Standard rollers and wide brushes simply won't fit. Here's what works:

Tool	Best Use
Angled sash brush (25–50 mm)	Cutting in along edges and corners
Slim mini roller (75–100 mm)	Rolling flat wall sections in narrow gaps
Radiator roller	Long handle reaches behind and above units
Bent or flexible brush	Extreme corners where nothing else fits
Extension pole	Reaching the top of tall wardrobes

You can find most of these tools at Bunnings or Mitre 10.

Painting Technique for Tight Spots

Work top to bottom — Always paint from the highest point downward so drips land on unpainted surfaces.
Cut in first — Use your angled brush to carefully paint all edges, corners, and the strip directly behind the unit frame.
Roll the open sections — Once edges are done, use your mini roller to fill in any flat wall area you can reach.
Two coats — One coat is rarely enough. Allow the first coat to dry fully (check the tin for recoat times — typically 2–4 hours for water-based paints) before applying the second.
Don't overload the brush — In tight spaces, excess paint leads to drips and runs that are very hard to fix later.
Use a torch or work light — Proper lighting behind dark units is essential to see what you're doing and spot missed patches.

Should You Remove the Unit?

If the shelving or wardrobe is not structurally fixed and can be safely moved, removing it temporarily is always the best option — it gives you full access and a far better result. However, if the unit is built-in and fixed to the wall, do not attempt to remove it yourself if it involves disconnecting electrical fittings, light switches, or power points. Any work on fixed wiring is restricted electrical work and must be carried out by a registered electrician. Check the Electrical Workers Registration Board (EWRB) to find a licensed electrician.

When to Call a Professional

Consider hiring a qualified painter if:

The area is large, heavily soiled, or has significant mould or moisture damage
You need colour matching to existing walls and want a seamless result
The job involves working at height (above 1.5 m on a ladder in a confined space carries real fall risk — see WorkSafe NZ for ladder safety guidance)
The shelving is part of a full room repaint and you want a professional finish throughout

A skilled painter will have the specialist tools and experience to get into tight spaces efficiently and deliver a clean, lasting result. You can find qualified local painters on tradedirectory.co.nz.