Whether you're touching up a scuffed wall or repainting a single room to blend with the rest of the house, matching an existing paint colour is one of the most common — and frustrating — DIY challenges. The good news is that NZ paint retailers have excellent tools to help, and with a bit of preparation you can get a result that's hard to tell apart from the original.
Why Exact Colour Matching Is Harder Than It Looks
Paint colours change over time. Fading from UV exposure, dirt, and the natural ageing of pigments all shift a colour away from its original tone. Even a freshly painted wall can look slightly different depending on the sheen level, the number of coats applied, and the lighting in the room. This means a perfect spectrophotometer match won't always look identical once it's on the wall — something worth keeping in mind before you start.
Step 1 — Try to Find the Original Colour Name or Code
Before anything else, check whether you already know the colour. Look for:
- Old paint tins in the garage or shed — the label should show the colour name, code, and brand.
- Renovation records or LIM reports — some previous owners document paint colours used.
- Builder's specifications — if the home is relatively new, the builder or Licensed Building Practitioner may have records.
If you find the original colour code, take it straight to the paint store. Bear in mind that if the paint is several years old, you may still need to account for fading on the wall.
Step 2 — Take a Paint Chip or Sample to a Paint Store
If you don't have the original details, the next best option is to take a physical sample to a paint retailer. Here's how to do it well:
- Cut a small piece from an inconspicuous spot — behind a light switch plate, inside a wardrobe, or from a spare offcut of timber or board.
- Make the sample at least 5 cm × 5 cm if possible; larger is better for the scanner.
- Keep it clean and unscratched — oils from your fingers can affect the reading.
- Take it in during daylight hours if you can, though most stores use controlled lighting.
Resene and Dulux both offer spectrophotometer colour scanning at their stores — a device that reads the exact light wavelengths reflected by your sample and matches it to their colour database. Wattyl products are also available through many hardware stores with similar tinting services.
Step 3 — Use a Colour Scanning Service
Spectrophotometer scanning is the most accurate method available to homeowners. The machine produces a formula that the store mixes on the spot. A few tips:
- Ask the store to match to the closest standard colour in their range first — this makes future reorders much easier.
- Request a test pot before committing to a full tin. Apply it to the wall and check it in different lighting conditions (morning light, evening light, artificial light).
- If the scanned colour looks slightly off once dry, ask the store to adjust the tint — most will do this at no extra charge.
Step 4 — Account for Sheen and Finish
Colour is only half the equation. Sheen level — flat/matt, low sheen, semi-gloss, or gloss — dramatically affects how a colour looks on the wall. A low-sheen version of a colour will look noticeably different from a gloss version, even if the pigment formula is identical. Check your existing paint's finish and match it as closely as possible.
| Sheen Level | Typical Use | Light Reflection |
|---|---|---|
| Flat / Matt | Ceilings, low-traffic walls | Very low |
| Low Sheen | Living areas, bedrooms | Low–medium |
| Semi-Gloss | Kitchens, bathrooms, trims | Medium–high |
| Gloss | Doors, skirting, exterior trims | High |
Step 5 — Prep and Application Tips for a Seamless Blend
Even a perfect colour match can look patchy if the application isn't right. Follow these steps:
- Clean the surface thoroughly before painting — grease and grime cause uneven absorption.
- Feather the edges of any touch-up area rather than painting a hard line.
- Apply the same number of coats as the original — one coat over a two-coat finish will often look thinner and shinier.
- For larger areas, consider painting the entire wall from corner to corner rather than spot-patching. This hides any slight colour variation.
- Allow adequate drying time between coats as specified on the tin — NZ humidity, especially in Auckland and other northern regions, can extend drying times.
BRANZ has useful guidance on paint performance and surface preparation that's worth reviewing if you're working on an older home.
Exterior Colour Matching — Extra Considerations
Exterior paints fade faster than interior ones due to UV exposure and weathering. When matching exterior colours:
- Take your sample from a sheltered spot (under the eaves) where fading is minimal — this is closer to the original colour.
- Check whether your home is in a heritage zone or under an RMA covenant that restricts colour changes — your local council can advise.
- Use an exterior-grade paint rated for NZ conditions; UV resistance varies significantly between products.
When to Call a Professional
For large areas, high-end finishes, or heritage properties where colour accuracy is critical, it's worth engaging a qualified painter. A professional will have experience blending colours on the wall and can often achieve a more seamless result than a DIYer. If you're unsure, you can find qualified local painters on tradedirectory.co.nz.
For any painting work involving lead paint (common in homes built before the 1980s), take extra care. WorkSafe NZ has guidance on working safely with lead-based paints, and in some cases a professional with appropriate PPE and disposal knowledge is the safest option.