Light Reflectance Value (LRV) Requirements UK: BS 8300 Contrast Rules Explained
27th Jun 2025
Light Reflectance Value (LRV) Requirements UK: BS 8300 Stair Nosing Contrast Guide
Light Reflectance Value (LRV) is a key requirement in UK building regulations for stair safety and accessibility. Guidance such as BS 8300 recommends sufficient visual contrast between stair nosings and treads to help users clearly identify step edges.
This guide explains Light Reflectance Value requirements, the 30-point contrast rule, and how to achieve compliance in public and commercial buildings.
For a broader overview of legal obligations, see our complete UK stair nosing requirements guide.
Light Reflectance Value (LRV) in UK Building Regulations
Light Reflectance Value (LRV) is used in UK building regulations and guidance to ensure that building elements are visually distinguishable. On stairs, this is critical for identifying step edges and reducing the risk of trips and falls.
Approved Document M and BS 8300 both reference the need for visual contrast, with LRV being the standard method used to measure this.
What Is Light Reflectance Value (LRV)?
Light Reflectance Value (LRV) measures how much visible light a surface reflects on a scale from 0 (black) to 100 (white). It is the standard method used in the UK to assess visual contrast between surfaces.
Differences in LRV allow people, particularly those with visual impairments, to distinguish between adjacent surfaces such as stair treads and nosings.
LRV Contrast Requirements for Stair Nosings (30-Point Rule)
UK guidance in BS 8300 recommends a minimum 30-point difference in Light Reflectance Value (LRV) between stair nosings and the stair tread.
- Stair nosings must contrast visually with the tread surface
- A minimum difference of 30 LRV points is recommended
- The contrast should be clearly visible under normal lighting conditions
- Highly reflective or glossy finishes should be avoided
Example:
- Stair tread LRV: 25
- Stair nosing LRV: 60
- Difference: 35 → Compliant
Why LRV Contrast Is Important for Accessibility
Adequate LRV contrast is essential for safe stair use and accessibility compliance. Poorly defined step edges are a common cause of trips and falls, particularly for visually impaired users.
- Clearly defines the edge of each step
- Reduces the risk of slips, trips, and falls
- Supports visually impaired and elderly users
- Helps demonstrate compliance with the Equality Act 2010
For broader accessibility requirements, see our guide to stair nosing accessibility compliance.
Measuring and Achieving LRV Contrast
LRV values are determined through laboratory testing or manufacturer data. To achieve compliant contrast:
- Use a light-coloured nosing on dark stair treads
- Use a dark-coloured nosing on light stair treads
- Avoid patterns or finishes that reduce visible contrast
Lighting conditions can affect perceived contrast, so LRV performance should be considered alongside real-world lighting.
Common LRV Compliance Issues
- Insufficient contrast between nosing and tread
- Glossy or reflective nosing surfaces
- Assuming colour difference automatically equals LRV contrast
- Wear or dirt reducing visible contrast over time
Correct fitting and material choice are essential. Our guide on how to install stair nosings correctly explains how installation affects long-term compliance.
LRV Compliance Checklist
- Is there at least 30 LRV contrast between the nosing and tread?
- Is the nosing finish non-reflective?
- Is the contrast clearly visible under site lighting?
- Will wear or dirt affect long-term visibility?
Stair Nosing Products for LRV Compliance
Choosing the right product is essential to achieving compliant contrast. Browse our full range of stair nosings designed for safety and regulatory compliance.
For high-traffic environments, explore our commercial stair nosings with durable inserts and tested LRV performance.
Download the LRV Stair Nosing Guide (PDF)
FAQs
What is the LRV requirement for stair nosings?
BS 8300 recommends a minimum 30-point difference in Light Reflectance Value (LRV) between stair nosings and treads.
Is LRV a legal requirement in the UK?
LRV is referenced in guidance such as BS 8300 and Approved Document M, which support compliance with building regulations and accessibility requirements.
Does colour difference guarantee LRV contrast?
No. Two colours may appear different but still have similar LRV values. Measured contrast is required to ensure compliance.