Daylight and Sunlight Assessments

Daylight and Sunlight Assessments for Planning and Design Teams

KJ Tait provides daylight and sunlight assessments for planning applications, design development and environmental performance analysis across the UK. We support architects, planning consultants, developers and asset managers with technical daylight modelling, BRE sunlight analysis and building performance advice for both residential and commercial projects.

Our assessments help project teams understand how proposed developments affect daylight availability, sunlight access and neighbouring amenity. We provide clear technical reporting, practical design input and modelling outputs that support informed planning and design decisions.

We regularly support projects involving urban infill developments, mixed-use schemes, office refurbishments, residential developments, student accommodation and commercial buildings where daylighting performance forms part of the planning or sustainability strategy.

BRE Daylight and Sunlight Assessments

Our daylight and sunlight assessments are typically undertaken in accordance with the latest BRE guidance, including Site Layout Planning for Daylight and Sunlight: A Guide to Good Practice. We assess the likely impact of proposed developments on neighbouring properties and internal spaces using recognised industry methodologies and digital modelling tools.

Typical BRE Daylight Analysis Includes:

• Vertical Sky Component (VSC)
• No Sky Line (NSL)
• Average Daylight Factor (ADF)
• Daylight Distribution Analysis
• Overshadowing Assessments
• Sunlight Availability to Amenity Spaces
• Annual Probable Sunlight Hours (APSH)

Our reports are developed to align with planning authority expectations while remaining commercially focused and technically robust. We aim to identify risks early and provide practical recommendations where daylight or sunlight performance may become constrained.

Planning Support and Design Stage Daylighting Analysis

Daylight and sunlight performance can significantly influence planning outcomes, particularly on constrained urban sites or where developments interface closely with neighbouring buildings. Early stage daylight analysis can help design teams understand potential planning risks before layouts are fixed.

KJ Tait works alongside planning consultants, architects and wider design teams to provide technical modelling and design stage support throughout the planning process. This includes feasibility studies, massing reviews, planning submission reports and responses to planning comments or objections relating to daylighting and sunlight access.

We focus on providing commercially realistic advice that balances planning compliance, development viability and building performance outcomes.

BREEAM Daylight Assessments

We also undertake daylight assessments in support of BREEAM certification and wider sustainability objectives. Daylighting performance can contribute to occupant wellbeing, visual comfort and energy efficiency while supporting environmental assessment frameworks.

Our BREEAM daylight modelling services typically assess internal daylight performance against relevant criteria within the applicable BREEAM scheme. This may include daylight illuminance analysis, glare considerations and spatial daylight performance depending on project requirements.

We coordinate closely with sustainability consultants, architects and MEP designers to ensure daylighting strategies align with wider building performance objectives including overheating mitigation, operational energy performance and occupant comfort.

Digital Daylight Modelling and Building Performance Analysis

Our team uses advanced digital modelling techniques to assess daylight and sunlight performance across a range of building typologies and project stages. Daylight modelling can support planning submissions, sustainability strategies and wider environmental design analysis.

We understand that daylight performance does not sit in isolation. Daylighting strategies often interact with overheating risk, façade design, operational energy use and occupant comfort. Our wider building physics and sustainability expertise allows us to consider daylighting within the context of overall building performance.

This integrated approach supports more informed decision-making during concept design, planning and technical development stages.

Why Teams Appoint KJ Tait for Daylight and Sunlight Consultancy

• Clear and technically robust reporting
• Commercially focused planning support
• Experience supporting complex urban developments
• Integrated sustainability and building performance expertise
• Collaborative support for architects and planning consultants
• Early-stage feasibility and massing analysis
• UK-wide project support

We work collaboratively with project teams to provide practical advice, responsive technical support and clear modelling outputs that assist planning submissions and design development.

Frequently Asked Questions

What is a daylight and sunlight assessment?

A daylight and sunlight assessment evaluates how a proposed development affects daylight levels, sunlight access and neighbouring amenity. Assessments are commonly required as part of planning applications for residential, mixed-use and urban developments.

When is a daylight assessment required for planning?

Planning authorities may request a daylight and sunlight assessment where a development could affect neighbouring properties, internal daylight levels or external amenity spaces. This is particularly common on constrained urban sites or taller developments.

Do you undertake BREEAM daylight assessments?

Yes. KJ Tait supports BREEAM daylight modelling and environmental analysis for commercial and residential developments as part of wider sustainability and building performance strategies.

Can daylight modelling be completed at early design stage?

Yes. Early-stage daylight modelling can help identify planning risks, façade constraints and massing issues before layouts are fixed. This often supports more efficient planning and design development.