Rooflight Buying Checklist for a Flat-Roof Extension

Before ordering a rooflight, agree the product type, finished order dimensions, glazing and installation details together. Use this checklist for a flat-roof extension, then compare the products that meet your confirmed specification.

Still deciding between product types? Start with our detailed guide to choosing a rooflight for an extension. This page focuses on the checks to make before you buy.

1. Confirm what you are ordering

Is it a complete fixed rooflight, a framed or frameless design, or replacement glazing for an existing assembly? A roof lantern is a different product type. Do not assume an ordinary fixed rooflight opens or is suitable for walking on.

Browse our flat-rooflight range and check the specification of the exact listing. For an option not shown, ask about availability before planning the roof around it.

2. Label every measurement

Write the width and length in millimetres, and state whether they refer to the structural opening, upstand, daylight opening or overall unit. These can be different. Follow the manufacturer's instructions for the selected system and have your installer confirm the required finished order size.

Our rooflight sizing guide and bespoke quote checklist explains the differences. Do not assume a larger bespoke size has the price or delivery time of a standard online product.

3. Confirm the glazing specification

• Double or triple glazing, where available for the selected product.
• The exact clear, solar-control or privacy finish you want.
• The documented safety-glass construction for the intended installation.
• What any quoted thermal-performance figure measures: glass or the complete unit.
• Whether a self-cleaning coating is actually included in that specification.

Consider daylight, glare and summer comfort together with your designer. Bigger is not automatically better, and a coating does not replace the room's ventilation strategy. Compare the available glass options, then verify them on the product you intend to order.

4. Agree installation and handling

Confirm the supporting structure, kerb details, required pitch, weathering and fitting instructions with the people responsible for the roof. Check delivery access and how the unit will be lifted and handled safely. SmartaView supplies the product only; installation is arranged separately.

5. Review the complete quotation

Check that it identifies the product, dimensions and their measurement basis, glass, frame or border details, quantity, VAT-inclusive total, delivery arrangement and lead time. Resolve any difference between your request and the written specification before accepting it.

For a bespoke requirement, send your dimensions, drawing or photographs, delivery postcode and intended timescale to the SmartaView team. We will check the available specification and quotation before you order. Approximate measurements are for initial guidance only, not manufacture.