A developer in the UK would need a daylight assessment for several key reasons, many of which align with those of an architect, but with a specific focus on project viability, financial implications, and regulatory compliance. Here are the primary reasons a developer would require a daylight assessment:

If a new development significantly impacts the daylight access of neighboring properties, it can lead to objections from residents or even legal challenges. A daylight assessment helps the developer identify and address potential issues early on, reducing the risk of costly delays or legal battles.

In the UK, property owners have a legal "right to light" under certain conditions. A daylight assessment helps ensure that the new development doesn't infringe on this right, avoiding potential compensation claims or the need to redesign the project.

Properties with good natural light are more attractive to buyers and tenants, which can lead to higher sales or rental values. A daylight assessment allows developers to optimize the design of their buildings to maximize daylight, making the properties more desirable in the market.

Well-lit spaces are more appealing to tenants, leading to faster lease-ups and potentially higher occupancy rates. This is particularly important in residential, office, and retail developments.

Daylight assessment can inform the layout and design of a building, helping developers make informed decisions about window placement, room orientation, and other design factors. This ensures that the space is both functional and attractive, maximizing the return on investment.

Investors and lenders may require daylight assessments as part of their due diligence process. Demonstrating that a development meets daylight standards can increase confidence in the project's viability and reduce perceived risks, making it easier to secure funding. Addressing daylight concerns proactively can help developers engage positively with the local community. By demonstrating that they have considered the impact on neighboring properties, developers can reduce opposition to the project and foster goodwill.