Daylight & Sunlight Assessments

Expert daylight sunlight assessments to ensure new developments receive adequate natural light, comply with planning standards, and protect neighbouring properties. Our detailed daylight and sunlight assessments support planning applications by identifying potential impacts early and providing clear, compliant solutions. We help architects and developers meet regulatory requirements while enhancing design quality, occupant wellbeing, and overall project success.

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Understanding Daylight & Sunlight Assessments

Our daylight sunlight assessments evaluate how much natural light new buildings and outdoor spaces receive, ensuring every development meets planning standards and design expectations. These detailed daylight and sunlight assessments help create comfortable, well-lit interiors, minimise overshadowing impacts on neighbouring properties, and support balanced urban development. By combining accurate analysis with practical design guidance, we help architects and developers achieve compliant, sustainable, and light-filled spaces that enhance occupant wellbeing and overall project quality.

Our Assessment Process

1. Site & Design Review

Evaluate layouts, window orientation, and surrounding structures for daylight access.

2. Light Modelling

Simulate daylight (VSC, NSL) and sunlight (APSH) for rooms and external spaces.

3. Impact Assessment

Analyse potential effects on neighbouring properties and amenity spaces.

4. Recommendations

Provide mitigation strategies to optimise natural light and support planning approval.

Key Factors Assessed

• Vertical Sky Component (VSC) – Measures daylight visible from windows.
• No Sky Line (NSL) – Evaluates daylight distribution within rooms.
• Annual Probable Sunlight Hours (APSH) – Calculates sunlight exposure for rooms and gardens.
• Overshadowing – Assesses impact of new buildings on neighbours.
• External Amenity Spaces – Ensures gardens, courtyards, and playgrounds receive sunlight.

Planning Compliance

Our assessments align with BRE Guidelines (BR209) and provide evidence for local planning authorities while protecting neighbours’ access to light.

Assessment Methods

We use 3D modelling, CAD software, and advanced simulations to deliver accurate results for both new developments and existing properties.

Optimised Layouts

Position windows and rooms to maximise daylight and sunlight exposure.

Shading Solutions

Reduce glare while maintaining adequate natural light inside rooms.

Neighbour Impact Management

Minimise overshadowing of adjacent properties and amenity spaces.

Outdoor Space Enhancement

Ensure gardens and courtyards maintain usable sunlight throughout the year.

Trusted Daylight and Sunlight Experts

At A+E Consultancy Ltd, We provide clear, practical guidance to ensure your building projects meet the highest sustainability standards. As a leading energy and sustainability consultancy, we bridge regulatory requirements with practical design solutions. We help with UK building regulations like Part L, Part O, and Part G.

By reviewing your plans early, we ensure your development complies with all regulations and performs effectively over the long term. We provide straightforward reports and professional daylight and sunlight assessments, streamlining the process for both residential and commercial properties.

Expert Energy Consultant for Architects

Designers often grapple with the challenge of harmonising aesthetics with demanding carbon targets. We offer our services as a supportive energy consultant for architects, providing technical insights that enhance your design vision.

• SAP & SBEM Calculations: We conduct energy assessments to ensure compliance with regulatory requirements for residential and commercial buildings.
• Overheating Assessments: We assess developments against Approved Document Part O and provide documentation for Building Control approval.
• Daylight & Sunlight Assessments: We provide practical guidance to help you make informed design decisions without compromising your scheme’s aesthetics.

How We Work

Our fast steps save time and cut risk right from the start.

• First Check: We review your drawings to identify potential issues at an early stage.
• 3D Modelling: We use dynamic simulation software to test daylight levels, sunlight to open spaces, and impact on neighbouring buildings.
• Final Report: We send you the report you need for planning based on the UK’s most recognised guidance for daylight and sunlight assessments, BR209 updated in 2022.

We support projects of all sizes, from small residential builds to large commercial developments. Rely on our team to provide the technical foundation your project needs to succeed. Our tailored approach helps ensure each project achieves a lower environmental impact.

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Frequently Asked Questions

Q1. What is a Daylight and Sunlight Assessment and when is one required?
It’s a technical study that measures how much natural light neighbouring properties and the proposed development itself will receive, both before and after a scheme is built. Councils request them for developments that could overshadow existing homes or gardens, particularly in dense urban areas or where a new building sits close to an existing one.

Q2. How is daylight and sunlight impact actually measured?
Assessors build a 3D model of the existing and proposed buildings, then calculate metrics such as Vertical Sky Component (how much sky is visible from a window) and Annual Probable Sunlight Hours (how much direct sunlight reaches a room over the year). These are compared against BRE guideline targets, and any reduction is checked against the recommended thresholds for neighbouring properties.

Q3. My scheme shows a daylight reduction beyond BRE guidelines; does that mean it will be refused?
Not automatically. BRE guidance is explicitly described as advisory rather than a hard planning limit, and officers weigh a shortfall against site constraints, existing urban context and the wider benefits of the scheme. In dense city environments, a degree of daylight reduction is often accepted as inevitable and reasonable. What matters is that the assessment clearly explains why any exceedance occurs and, where possible, shows what design changes were considered to reduce the impact.

Q4. What’s the difference between a planning daylight assessment and a ‘right to light’ survey?
A planning daylight & sunlight assessment addresses local authority policy and BRE guidance as part of the planning process, and is a public document submitted with the application. A right to light survey is a separate, private legal matter concerning a neighbouring owner’s actual legal entitlement to light, which can exist independently of planning permission and is typically handled by a chartered surveyor or solicitor.

Q5. What drawings or information do you need to start a daylight and sunlight assessment?
Scaled site plans, elevations and floor plans of the proposed development are the starting point, along with equivalent information on any neighbouring buildings that could be affected; existing surveys, OS data or measured drawings work well here. Site levels and orientation are also needed to build an accurate 3D model.