Summary

Clients frequently ask their decorator for colour recommendations, even when you've been hired purely to apply paint. Knowing how to guide that conversation — without overstepping into interior design territory — is a practical skill that saves repaint callbacks, builds trust, and can generate repeat business. A decorator who says "I'd recommend a warm white here to counteract the north-facing light" is far more valuable than one who simply asks "what colour do you want?"

Colour selection is also a source of real commercial risk. Colour approved on a small swatch often looks dramatically different across a full wall under different lighting conditions. Understanding metamerism, LRV (light reflectance value), and undertone shifts protects you from the common scenario of a client who selected a neutral grey but ends up with a lavender wall.

This guide covers practical colour advice you can offer clients, how to use manufacturer systems professionally, and how to protect yourself commercially when clients make colour choices you have doubts about.

Key Facts

  • BS 5252 — UK colour standard providing 237 reference colours used in architectural specifications; rarely used by domestic clients but may appear on commercial specs
  • NCS (Natural Colour System) — Swedish system widely used in UK construction; defines colours by hue, blackness, and chromaticness (e.g. S 2030-Y90R)
  • RAL — German system common in commercial/industrial work (RAL 9010 = pure white); standard for powder-coated metalwork, windows, and doors
  • LRV (Light Reflectance Value) — percentage of light a colour reflects; ranges 0 (black) to 100 (white); values above 70 read as "light", below 40 as "dark"
  • Metamerism — the phenomenon where two colours match under one light source but not another; critical when matching existing paint using artificial lighting
  • Undertones — all whites and neutrals carry a warm (yellow/pink), cool (blue/green), or neutral undertone; undertone shifts dramatically with room orientation
  • North-facing rooms — receive cool, indirect light; warm undertones (cream, yellow, pink-biased) offset the coldness better than cool greys
  • South-facing rooms — bright, warm light; can handle cooler tones (blue-greys, cool whites) without feeling cold
  • Sheen level affects perceived colour — matt absorbs light and colours read softer; eggshell/silk reflects light and colours appear more saturated and slightly darker
  • Fan decks — manufacturers supply large colour fans for professionals; Dulux Trade, Johnstone's, and Crown all offer free or subsidised trade fan decks
  • Sample pots — always recommend clients paint at least A4-size samples on the actual wall, not card, and view at different times of day
  • Three-colour rule — a simple formula for domestic rooms: 60% dominant (walls), 30% secondary (woodwork/soft furnishings), 10% accent

Quick Reference Table

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Paint finish LRV effect Best use
Dead matt (15–30° gloss) Absorbs light, softens colour Walls, ceilings — hides imperfections
Matt emulsion (30–40°) Minimal reflection General walls
Soft sheen / eggshell (40–70°) Slight reflection, colour appears richer Woodwork, damp-prone rooms
Silk emulsion (70–85°) Noticeable sheen, colour deepens Feature walls, kitchens
Satin (85–95°) High sheen, colours appear darker Woodwork, trims
Gloss (95–100°) Maximum reflection, significant colour shift Exterior woodwork, radiators
Room orientation Light quality Colour recommendation
North-facing Cool, blue-toned, low brightness Warm whites (LRV 75+), ochres, warm greys
South-facing Warm, bright, changes through day Versatile — cool and warm tones both work
East-facing Warm morning light, cool afternoons Balanced neutrals, soft yellows
West-facing Cool mornings, warm golden evening light Cool tones in the morning read warm by evening

Detailed Guidance

Using Manufacturer Colour Systems

Every major UK manufacturer has a proprietary colour system. Understanding how they cross-reference protects you when a client specifies a colour from one brand but you're using another.

Dulux Trade uses its own colour palette of approximately 1,200 colours plus a mixing service. The Dulux Trade colour finder provides cross-references to NCS and RAL codes. For most domestic work, working within the Dulux palette with a trade mixing base gives you reliable batch consistency.

Farrow & Ball is specified on heritage and high-end domestic work. Their colours have high pigment loads and distinctive finishes but are expensive and less forgiving on substrate imperfections. If a client specifies F&B but you want to use a different product, manufacturers like Mylands and Little Greene offer matched alternatives — always get written client approval before substituting.

Little Greene offers an excellent range of historical colours and is increasingly used on period property work. Their paint is waterborne but formulated to replicate traditional finishes — useful when working in conservation areas where solvent-based paints may be restricted.

RAL matching is most relevant on commercial work: steel lintels, metal window frames, roller shutters, and powder-coated surfaces all use RAL references. Ensure you know the specific RAL code before pricing — RAL 7016 (anthracite grey) and RAL 7021 (black grey) look almost identical in print but produce very different results.

Giving Colour Advice Without Overstepping

Clients often want direction, not just execution. Here's how to structure colour conversations professionally:

Ask about light first. "Which way does this room face?" immediately demonstrates expertise and gets to the key variable before you've looked at a single colour chip.

Identify the fixed elements. Flooring, tiles, and fixed furniture colours should anchor the palette — these are the most expensive to change. Pick up undertones from these elements for the wall colour.

Present choices in threes. Two feels limiting; more than four overwhelms. A warm option, a neutral, and a cool option within the same LRV band gives clients structure.

Use the LRV band to manage expectations. If a client wants a dramatic dark room (LRV <30), flag that it will require primer and two full coats of colour, and that the room will need more artificial lighting. Price accordingly.

Never recommend a colour you have doubts about without written client sign-off. If a client insists on a colour you think will look wrong, provide a written email confirmation: "As discussed, you've chosen [colour reference] for the living room. I'd recommend viewing a sample on the wall in daylight before we proceed, and I'm happy to arrange this. If you'd like to go ahead without a sample, please confirm by reply." This is not excessive — it protects both parties.

Colour Reference Systems for Commercial Work

Commercial specifications often reference NCS codes rather than manufacturer names. The NCS code format is: S [blackness][chromaticness]-[hue].

For example, NCS S 2030-Y90R means:

  • S = second edition
  • 20 = 20% blackness
  • 30 = 30% chromaticness (saturation)
  • Y90R = hue 90% towards red from yellow (i.e. orange-red)

Most UK paint manufacturers can match to NCS codes. Dulux Trade, Johnstone's, and Crown all offer NCS-matched mixing. Always specify the batch code and manufacturer on the quote for commercial work so any future touching up matches.

Dealing with Client Colour Changes Mid-Job

Colour changes are one of the most common sources of scope creep in decorating. Price and process upfront:

  • Colour changes to agreed specification = variation order with additional material and labour cost
  • Finish changes (matt to silk on all walls) = significant repricing
  • One wall changed = manageable; all four walls changed = full reprice

Include this clause in your T&Cs or quote: "Colour changes to approved specifications will be treated as a variation and charged at [£day rate]. Colour approval is confirmed by the client applying and approving a sample pot prior to full application."

Frequently Asked Questions

Should I carry sample pots to show clients?

Carrying 10–20 of your most commonly specified neutral shades is useful, but the real value is having a trade fan deck and knowing how to use it. Most manufacturers supply fan decks free to registered trade accounts. The key advice to give clients is always the same: paint a sample on the actual wall, not card, and look at it at different times of day before committing.

A client's chosen colour looks wrong on the wall — what do I do?

Stop before you've painted more than the first coat. Show the client the issue in good daylight. If the colour was client-specified and approved, document the situation in writing and offer to re-do in a different colour as a chargeable variation. If you specified the colour and it's wrong, you'll need to repaint at cost — which is why getting written approval on sample pots is essential before you pick up a roller.

How do I match existing paint when the client doesn't know the colour?

Use a spectrometer service — most Dulux Trade and Johnstone's trade counters can scan a paint chip (scrape a coin-sized patch of paint off an inconspicuous area) and produce a formula match. Results vary with weathered or faded paints. Always warn the client that an exact match on a large fresh area will look slightly different from the existing aged surface — this is normal and unavoidable.

Can I recommend eco or low-VOC paints?

Yes, and increasingly clients ask for them. Dulux Trade Diamond and Johnstone's Covaplus Zero both offer very low VOC formulations suitable for occupied properties. For occupied spaces during painting, VOC content and ventilation are practical health considerations — not just marketing. Waterborne alkyds (solvent-replacement eggshells) have dramatically improved in recent years and are the go-to on woodwork in occupied residential.

Regulations & Standards

  • BS 5252 (Framework for Colour Co-ordination for Building Purposes) — the UK architectural colour reference standard; relevant on commercial and public sector projects

  • NCS (Natural Colour System) — internationally standardised; frequently used in UK architectural specifications and manufacturer cross-references

  • RAL Classic and RAL Design — European standard for powder coatings and industrial finishes; common on commercial metalwork and windows

  • VOC Directive (2004/42/EC, retained in UK law) — limits on volatile organic compounds in decorative paints; products sold in the UK must be within VOC content limits by category

  • BS 7543 — guide to durability of buildings and building elements, products, and components; relevant when specifying exterior paint lifespan

  • NCS Colour System — official NCS colour system and UK conversion tools

  • Dulux Trade Colour Fan — trade colour system and NCS cross-reference

  • RAL Colour Standard — official RAL colour codes including architectural ranges

  • Painting and Decorating Association — trade body guidance on professional colour specification

  • [interior emulsion|choosing interior emulsion paint finishes by room type](/wiki/painting/interior-emulsion|choosing interior emulsion paint finishes by room type) — finish selection goes hand-in-hand with colour selection

  • [paint coverage rates|calculating paint quantities from coverage rates](/wiki/painting/paint-coverage-rates|calculating paint quantities from coverage rates) — colour depth affects coverage — deeper colours often need more coats

  • [lining paper before decorating|using lining paper before painting to improve surface quality](/wiki/decorating/lining-paper-before-decorating|using lining paper before painting to improve surface quality) — surface preparation affects how colour reads

  • [scope creep|managing variation orders when clients change specifications mid job](/wiki/customer-comms/scope-creep|managing variation orders when clients change specifications mid-job) — colour changes are a common source of scope creep