“Choose a contrasting colour” is not a complete specification. A handrail may stand out against one wall finish and become much less distinct against the next. A bollard may be seen against paving on approach and glazing as the visitor moves closer.
Visual contrast is a relationship between an element and its background, not a property guaranteed by a colour name. The practical decision is to identify the surfaces, obtain the appropriate light reflectance values, compare them using the relevant criterion and review the combination in the actual setting.
This guide explains light reflectance value, or LRV, for architects, facilities managers and specifiers working on non-domestic buildings in the Republic of Ireland. It includes the relevant TGD M contrast criteria, a worked comparison, supplier questions and a colour-decision record that can be reused during maintenance.
It is the visual-contrast guide in SVL’s Protected and Accessible series. The focus is on choosing and retaining a defensible finish combination, not promising that a calculated difference will guarantee visibility for every person.
Table Of Contents
- Assessing and maintaining visual contrast
- What does light reflectance value mean?
- What LRV difference does Irish TGD M guidance use?
- Identify the visual task before choosing the finish
- Request exact finish data from the supplier
- Worked LRV comparison: one rail and two walls
- Review lighting, glare and viewing conditions
- Bollard contrast is not the same as retroreflective visibility
- Keep the colour decision intact during procurement
- Reassess contrast when finishes or lighting change
- Colour-decision record: a reusable specification tool
- Frequently asked questions
- Is 30 LRV points the same as 30 per cent contrast?
- Is yellow always a suitable contrasting colour for bollards?
- Can we calculate LRV from a photograph or colour sample on screen?
- Can a 20-point difference be used for a handrail?
- Does replacing the wall colour require a new rail?
- Does an LRV comparison prove the whole route is accessible?
- Discuss protective finishes and product information with SVL
- Sources and scope
Assessing and maintaining visual contrast
What does light reflectance value mean?
LRV describes how much visible light a surface reflects under the relevant measurement conditions. CEUD explains the scale from black at 0 to white at 100, and uses differences between surface values to assess visual contrast.1
For a simple comparison, subtract the lower value from the higher value:
LRV difference = higher LRV − lower LRV.
For example, hypothetical surfaces with LRVs of 80 and 20 differ by 60 points. The result is not “60 per cent more accessible”. It is a numerical difference between the two stated surface values.
That distinction makes the comparison repeatable. Another reviewer can identify the same surfaces, check the source values and reproduce the arithmetic. They can also see when a proposed change alters the calculation.
What LRV does not tell you
A value does not establish whether the rail is hidden behind equipment, whether the background changes along the route or whether lighting creates glare. Nor does it establish the rail’s support performance or the position of a post within the pedestrian journey.
Keep those questions separate. Product data inform the surface comparison; the plan establishes what is being compared; the installed review examines how that relationship works in context.
Do not estimate an LRV from a photograph or an on-screen swatch. A colour name, visual impression or similar-looking finish from another supplier is not a substitute for data relating to the actual material and finish.
What LRV difference does Irish TGD M guidance use?
The Department’s publication page identifies Technical Guidance Document M — Access and Use 2022 as the current edition. Its application must be considered in relation to the building and proposed work.2
Section 1.6.4 uses the following distinctions where visual contrast is provided.3
| Context in the guidance | LRV difference | Important qualification |
|---|---|---|
| General visual-contrast provision | At least 30 points | Use the measurement basis referenced in the document |
| Large areas, such as walls and floors | At least 20 points | Surface illuminance must be at least 200 lux |
| Door-opening furniture against its background | At least 15 points | This is the specific door-furniture provision |
The lower figures are not general permissions to use reduced contrast for any product. A support rail is not a large wall area because it is mounted on one. A bollard is not door-opening furniture because it stands beside an entrance.
Ask the responsible designer to identify the relevant provision for each comparison. Put that basis beside the calculation, including any lighting-dependent condition. Avoid an unqualified note saying “contrast to comply”.
The section refers to measurement methods in BS 8300:2009 Annex B or BS 8493:2008. Record the actual method and document revision behind supplied values, and have the responsible reviewer confirm applicability rather than treating every published number as directly interchangeable.3
This guide does not certify an installation from the table. Position, route usability, lighting and other applicable requirements still need their own review.
Identify the visual task before choosing the finish
Start with what someone needs to recognise. A support grip, a protective post, a door control and a wall panel have different roles.
For a handrail, identify the grip and the approaches from which users need to find it. For a bollard, examine the relevant parts of the post and the backgrounds encountered along the pedestrian approach. For door-opening furniture, identify the surface immediately behind the control.
Write that task in the schedule. “Identify the support grip when approaching the corridor junction” is more useful than “use high visibility colours”. It tells the reviewer where to look and which relationship matters.
Map changes in the background
Give each meaningful element-and-background relationship a location reference. A continuous rail may need several entries if it passes different wall finishes, doors or glazed areas.
In a hypothetical public administration building, one rail runs beside a pale wall, a darker feature panel and a doorway. The product code does not change, but the assessment relationships do. A calculation for the first wall should not stand in for the other locations.
Do not average the background values across the building. An average can conceal a weak comparison at the very point where someone needs to identify the rail.
For projects using protective wall cladding, keep the cladding package connected to the rail finish schedule. A change made by one supplier can alter a relationship originally reviewed with another.
For the underlying support function, use our handrail and wall-protection specification guide. Colour selection should support that brief rather than replace its grip, continuity and fixing decisions.
Request exact finish data from the supplier
Record the manufacturer, product, component, material, colour code, finish and source of the value. “Dark grey rail” and “off-white wall” are not traceable inputs.
Gradus states that its handrail colours have measured LRVs. Its CHR160 combination rail is therefore a relevant starting point for a finish-data request through SVL.4 Ask for the current information covering the exact product and colour being proposed, rather than treating a range-wide statement as the completed assessment.
Obtain equivalent information for the wall or other background. A documented rail value cannot complete the comparison when the wall finish is unknown.
| Information to request | Why the record needs it |
|---|---|
| Exact product and component | The grip, cover, return and bracket may require separate identification |
| Material, finish and colour code | The approved appearance must be connected to the supplied surface |
| LRV and measurement basis | Another reviewer needs to understand the numerical input |
| Document date or revision | Procurement needs the applicable source, not an unlabelled screenshot |
| Background data | Contrast depends on both surfaces |
| Unresolved qualifications | Conditional or unavailable information must remain visible |
Check individual components
A system may include a rail cover, returns, brackets and adjacent wall protection. Do not assume every component has the same finish options or value.
Gradus’s current CHR160 page, for example, identifies a specific colour limitation for the CHR1603 mounting bracket. The point is not to prescribe a bracket colour for every project; it is to confirm which components the proposed colour schedule actually covers.4
When reviewing hospital wall guards or corner protection, request the data needed for those exact surfaces. Do not borrow a rail’s LRV because another protective product looks similar.
Deal with missing or conflicting information openly
If two documents give different data, identify the discrepancy and seek clarification. Do not select the more favourable figure without knowing why it differs.
Where a value is unavailable, mark it unverified and allocate an action. An early design assumption can support discussion, but it should not become an accepted specification simply through repeated copying.
An identifiable physical sample can help check delivery against the agreed finish. Label it with the product, code and approval date. It remains a sample reference, not an independent measurement of LRV.
Worked LRV comparison: one rail and two walls
The following exercise uses entirely hypothetical values. They are not Gradus colour data, measurements from an SVL project or approved finish combinations.
Assume a proposed rail has LRV 20. It runs beside Wall A with LRV 80 and Wall B with LRV 45. For the exercise, use a 30-point comparison.
| Surface pair | Calculation | Difference | Arithmetic result against 30 points |
|---|---|---|---|
| Rail 20 and Wall A 80 | 80 − 20 | 60 points | At or above the exercise criterion |
| Rail 20 and Wall B 45 | 45 − 20 | 25 points | Below the exercise criterion |
The same rail produces two different results. It is not enough to say that the selected rail “has good contrast” without identifying the wall behind it.
The next decision is not necessarily to change the rail. The team could reconsider Wall B, explore other rail finishes or revise the coordinated palette. A narrow painted strip behind the rail should not be assumed to solve the issue without assessing the resulting arrangement.
Extend the comparison before accepting a replacement
Suppose the team considers three alternative rail values. Retain both wall backgrounds in the comparison.
| Hypothetical rail LRV | Difference from Wall A, LRV 80 | Difference from Wall B, LRV 45 | What the arithmetic shows |
|---|---|---|---|
| 10 | 70 points | 35 points | Both pairs reach the exercise criterion |
| 55 | 25 points | 10 points | Neither pair reaches it |
| 85 | 5 points | 40 points | Only the Wall B pair reaches it |
The lighter option at 85 helps against Wall B but does not solve the comparison against Wall A. The option at 10 reaches the numerical criterion for both hypothetical backgrounds, but that is not an installed-accessibility approval. Availability, exact data, component finishes, lighting and the relevant project criteria still need confirmation.
This additional comparison is useful during value engineering. Replacing a dark finish with a lighter one may improve one part of the route while weakening another. Review every affected pair rather than choosing from a single sample arrangement.
Keep precision consistent with the evidence
Do not present a calculation from rounded inputs as more precise than those inputs. A result close to the applicable criterion needs appropriate review, not an invented tolerance or convenient rounding.
Record preliminary assumptions separately from confirmed values. When actual data arrive, repeat the calculation and retain the superseded version as a design record. That makes the reason for a later change understandable.
Review lighting, glare and viewing conditions
LRV comparison is not the end of the process. CEUD’s internal-environment guidance discusses lighting and the effects of glare, reflections and shadows on how surfaces are perceived.1
Select representative viewing positions based on the route, not the most flattering camera angle. Consider relevant daylight conditions and the artificial lighting used during the building’s operating hours.
Where a design decision depends on a stated illuminance, retain appropriate evidence for that condition. Do not treat the existence of a light fitting as confirmation of the required illumination at the surfaces being assessed.
A safely arranged sample installation or mock-up can help the team ask practical questions. Is the grip obscured at a junction? Does glazing change the background on approach? Does a reflection interfere with identification? Are temporary displays masking the intended cue?
Invite relevant user observations where practical and record the context. One successful demonstration should not be represented as proof of visibility for every user and operating condition.
Use photographs as records, not measurements
Photographs can record the installation, viewing direction and lighting condition. Unless an appropriate measurement method was actually used, they should not be presented as LRV evidence.
The same applies to a rendering or generated illustration. Printing an LRV beside a shaded rail does not establish that the image reproduces the measured appearance of the real material. Keep data, visual explanation and installed review clearly identified.
For PVC wall cladding and other background finishes, record the product actually installed. A photograph of a broadly similar panel should not replace the approved finish code and source data.
Bollard contrast is not the same as retroreflective visibility
A reflective band and an LRV comparison answer different questions. 3M explains retroreflection as directed light being returned towards its source, with the observer’s position relative to that source affecting apparent brightness.5
A feature intended to respond to vehicle headlights should therefore not be treated as proof that a pedestrian can identify the post under ordinary building lighting. The source of light, direction of approach and viewing position may differ.
For parking bollards and posts, identify the body, bands, paving and other relevant backgrounds in the specification. Ask which feature is expected to perform which visual task.
A yellow-and-black finish is not automatically an accessible arrangement. The post still needs an appropriate location, usable passage and a reviewed relationship with the actual background. Likewise, visual identification does not establish vehicle restraint.
Coordinate the exterior finish decision with the bollard-placement and accessible-entrance guide. That guide addresses the arrival route, installed footprints and door approach.
Keep pedestrian contrast and vehicle-related visibility as separate evidence requests where both matter. One product may contribute to several functions, but each needs its own explanation.
Keep the colour decision intact during procurement
The approved item is the surface pair, not an isolated sample. Link the rail or post finish to its background in the procurement record.
For example, a substitution in the wall-finish package should trigger a check of the related rail comparisons. A change in a rail cover should trigger a check against the walls along that run. Do not wait until both packages have been delivered to discover that each team approved a different combination.
Use a simple substitution request: identify the affected location, original pair, replacement product and new data. Repeat the relevant calculation and explain any remaining conditions before approval.
For broader product coordination, SVL’s wall protection systems guide provides related context. The contrast schedule should travel with those protection decisions rather than being filed separately as a decorative preference.
Require the delivered components to be checked against the accepted codes. A similar appearance is useful evidence for a visual check, but it is not confirmation that the replacement carries the same measured value.
Reassess contrast when finishes or lighting change
CEUD’s building-management guidance specifically connects redecoration with retaining or improving visual contrast.6 The original decision therefore needs an owner after installation.
Keep the approved surface pairs with the facilities records. Identify changes that should trigger a review: repainting, replacing cladding, changing a rail cover, altering lighting or adding a large display near an important element.
These are proposed management triggers, not universal statutory inspection intervals. Their purpose is to make the effect of a change visible before the original comparison is lost.
For multi-site organisations, standardising a product colour does not standardise every background. Keep location-specific comparisons even when the same rail is used across the estate. A satisfactory pair in one corridor is not evidence for another building.
When redecoration or replacement affects the normal route, use the guide to maintaining access during building maintenance. Include finish and lighting checks in the reopening decision.
Request cleaning and maintenance guidance for the actual materials. Where wear, staining or surface treatment raises doubts about the record, seek appropriate advice. Do not invent a fixed allowance for ageing or assume a universal deterioration rate.
Colour-decision record: a reusable specification tool
Use one entry for each meaningful element-and-background relationship. The record should allow a colleague to reconstruct the decision without relying on memory.
| Field | What to record |
|---|---|
| Location and viewing task | Run or object reference, approach direction and what people need to recognise |
| Element surface | Manufacturer, product, component, material, finish and colour code |
| Background surface | Exact wall, panel, door, paving or other relevant background |
| Source values | Each LRV, source document, revision and measurement basis |
| Evidence status | Confirmed data, provisional assumption or unresolved information |
| Calculation | Higher value minus lower value; record the difference in points |
| Assessment basis | Applicable provision, conditions and person confirming its relevance |
| Installed review | Lighting, viewing positions, sample checks and observations requiring action |
| Procurement control | Accepted pair, substitution decisions and component verification |
| Continuing ownership | Facilities contact and changes that should trigger reassessment |
A complete record makes an unknown background as apparent as a favourable calculation. Keep the source documents and marked-up location drawing with it.
The worked values in this article can be used to practise the method. Replace them with appropriate project information before treating a schedule as a live specification.
Frequently asked questions
Is 30 LRV points the same as 30 per cent contrast?
No. The method described here subtracts one LRV from another to give a point difference. It does not calculate a relative percentage improvement in visibility or accessibility.
Is yellow always a suitable contrasting colour for bollards?
No colour is automatically suitable against every background. Assess the exact material and finish against the relevant surfaces and lighting, alongside the post’s position and intended function.
Can we calculate LRV from a photograph or colour sample on screen?
Do not use an ordinary photograph or screen swatch as measured surface data. Obtain information for the exact finish or seek a suitable measurement assessment where reliable values are unavailable.
Can a 20-point difference be used for a handrail?
The lower TGD M provision discussed here applies to large areas such as walls and floors, subject to its illuminance condition. It should not be transferred to a handrail merely because the handrail is mounted on a large wall. Have the responsible designer confirm the relevant criterion.
Does replacing the wall colour require a new rail?
Not necessarily. It requires reassessment of the affected surface pair. The project may retain the rail, change the wall finish or investigate another arrangement. Confirm the actual data and review the result rather than deciding from the colour name alone.
Does an LRV comparison prove the whole route is accessible?
No. It addresses one defined visual relationship. Passage, support, door operation, hazards and other project requirements still need assessment. A numerical result should not be presented as certification of the complete installation.
Discuss protective finishes and product information with SVL
SVL provides product selection, survey and installation support across Ireland.7 A precise finish-data request helps connect that support with the architect’s or facilities team’s colour strategy.
Contact SVL about handrail, wall-protection or bollard finishes with the product references, proposed backgrounds and specification questions. Request the information needed for the exact configuration, and retain the project team’s responsibility for the overall assessment.
A useful colour decision is one another person can check: the element, its background, the evidence and the conditions remain connected.
Sources and scope
References were reviewed on 15 October 2026. This guide concerns non-domestic premises in the Republic of Ireland. Every value in the worked comparison is hypothetical; no named product colour or customer measurement is implied. The record is a proposed coordination tool, not a compliance certificate. Confirm current product information and project-specific requirements before procurement.
[1] CEUD / National Disability Authority, Building for Everyone, Booklet 4: Internal Environment and Services, section 4.4.3 on visual contrast and section 4.5 on lighting.
[2] Department of Housing, Local Government and Heritage, Technical Guidance Document M — Access and Use.
[3] Department of Housing, Local Government and Heritage, TGD M 2022, section 1.6.4, printed page 128. The qualifications and measurement references belong with the criteria.
[4] Gradus, CHR160 Combination Rail. Manufacturer statement on measured LRVs and component finish information. Obtain current exact-code data before selection.
[5] 3M, What is retroreflectivity and why is it important?. Used for the optical principle only, not US traffic requirements.
[6] CEUD / National Disability Authority, Booklet 8: Building Management, section 8.4.4 on maintenance and redecoration.
[7] SVL, About us. Published nationwide services.