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How-To Guide

How to Measure Windows for Replacement

Accurate measurement is the difference between a window that fits perfectly and one that doesn't. Here's how it works and why we always measure on site.

Why measurement is critical

A made-to-order window is built to the opening's exact dimensions. A small error becomes a poor fit — gaps, drafts, or a unit that won't seat. That's why measuring is a job for care, not guesswork.

Openings are rarely perfectly square

Older openings especially are seldom truly square or level. A proper measure checks width and height at multiple points and accounts for any out-of-square, so the finished unit fits the real opening, not an idealised one.

Why we measure on site ourselves

Rather than ask you to measure, we send our own team — the same people who'll build and fit the unit. That removes the risk of a mismeasure and means the responsibility for a correct fit stays with us.

Questions

Frequently asked

Can I measure my own windows?

You can for a rough idea, but for a made-to-order unit we measure on site ourselves — openings are rarely perfectly square, and a small error means a poor fit.

Why does on-site measurement matter?

Because the unit is built to exact dimensions. Measuring at multiple points and accounting for out-of-square openings ensures a proper fit.

Do you charge to measure?

Tell us about your openings and we'll arrange a site visit — get in touch and we'll explain how it works for your job.

From our range

Products that fit the bill

uPVC Sliding Windows

Multi-track windows that need no swing space.

uPVC Casement Windows

Side-hung sashes that open wide for full airflow and the tightest seal.

uPVC Sliding Doors

Floor-to-ceiling panels that glide along a track.

Related Guides

You might also need

Related guides covering this topic from other angles — different products, applications, or contexts.

Have a question about your home?

Still deciding what's right for your home? Tell us about your openings and we'll measure, advise, and quote — factory-direct from our Pannimadai works in Coimbatore.