Evaluating Daylight in a Project

Why it matters at project stage

The objective is to manage daylight for the room’s function rather than exclude it entirely. Work and relaxation areas on the same elevation may need different degrees of control.

Solar control is not simply room darkening. It balances daylight, glare, outward view and night-time privacy, with façade orientation and hours of use informing the number and role of each layer.

Information required

Review façade orientation, hours of use, glare points, outward-view objectives, night-time privacy, glazing information and the intended role of each textile or blind layer.

Verify screen openness, blackout performance and other technical values from the selected manufacturer data. Glazing, edge gaps, installation method and window geometry also influence the result.

Reaching a project decision

A sheer curtain or screen blind can filter light, while a dress curtain or documented blackout product can provide a more complete closing layer. Define each layer’s function and operating sequence.

Use “Is façade orientation known” and “Have glare points been identified” as decision gates for this subject. Compare any viable alternatives against those two project-specific questions, then document why the selected approach answers them.

Coordination through delivery

Coordinate lighting and façade decisions with the window treatments. Where measured performance is required, review fabric data, glazing and installation conditions with the relevant specialists.

Define the daytime and night-time role of every layer, then coordinate the tracks, pocket and controls around that sequence. Use project-specific objectives rather than a fixed energy-saving claim.

Before handover, resolve “Is outward view an objective” and “Is night-time privacy resolved” with the named project parties. Record the answer under the relevant opening or room reference so a later site, material or programme revision can be assessed against the correct approval.

Recording and verifying the decision

For evaluating daylight in a project, the approval record should identify the opening or room, current drawing revision, responsible party and date. Attach the dimensions, samples or system information needed to evidence “Is each layer’s role clear”; mark superseded decisions explicitly rather than relying on verbal instruction.

The release checklist for this guide is: Is façade orientation known; Have glare points been identified; Is outward view an objective; Is night-time privacy resolved; Is each layer’s role clear. Any unanswered point remains an action with a named owner and decision date, not an assumed instruction to proceed with production or installation.