Our team reviews the information provided, including the existing window type, architectural requirements and likely noise conditions. We then identify whether replacement windows, secondary glazing, acoustic doors or another approach appears most appropriate.

Where there is enough information, we prepare a provisional estimate so you can understand the likely scope and cost before committing to a detailed survey.

The initial estimate is based on the information supplied and may change following a site survey, final measurements or a revised specification.

When the initial estimate is suitable, the next step may be an on-site acoustic and window survey. This is more than a measuring appointment: we assess the noise, the existing windows, the building opening and the practical requirements of the project.

The visit is carried out by an acoustic specialist using professional measurement equipment, including an NTi XL2 acoustic analyser where acoustic readings are required. Surveys typically take around 90 minutes, depending on the size and complexity of the property.

During the visit, we may assess:

The existing windows and openings
We record the window type, condition, dimensions, reveal depth, surrounding construction and installation constraints. This helps us refine the proposed product and identify whether replacement windows or secondary glazing are likely to be more appropriate.

Real-world noise conditions
Where useful, we take acoustic readings during the visit to understand the noise present inside and outside the property. These may include:

• LAeq — the average sound level over the measurement period;
• LAFmax — the maximum level reached during individual noise events;
• frequency spectrum — the distribution of sound across different frequencies, helping us understand the character of the noise.

The readings are considered alongside what you experience at different times of day. A short survey may not capture every possible event, particularly intermittent aircraft, rail or late-night noise.

Ventilation, appearance and practical use
We discuss how the windows need to open, ventilation requirements, architectural appearance, conservation considerations and how the room is used.

The most appropriate level of specification
The purpose is not automatically to recommend the highest specification. In some properties, a lower-rated or less disruptive option may be more appropriate. In others, secondary glazing, a different opening style or treatment of another weak point may be necessary.

Following the visit, we refine the proposed solution and explain what can reasonably be expected before the project moves to final design and manufacture.

Following the survey and final measurements, we confirm the design, acoustic specification, finishes and installation requirements. Once approved, the windows or doors are manufactured for the individual openings.

Installation is completed by our specialist team, with attention to perimeter sealing, airtightness, alignment, finishing and the junction between the new product and the surrounding building.

We remain responsible for the project through specification, manufacture, installation and aftercare.