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Fitting uPVC Windows into Timber Openings

Replacing timber windows with uPVC? Here's how the opening is handled.

Fitting into an existing timber opening

When old wooden windows come out, the surrounding structure needs checking before the uPVC goes in. If the timber sub-frame or surround has rotted, that has to be dealt with — fitting a new window into rotten timber defeats the purpose.

What to know

Look for this

  • Old frame removed cleanly
  • Surrounding structure checked for rot
  • Any rot addressed before fitting
  • New frame seated true into sound structure
  • Fixed securely and sealed all around

The practical takeaway

This is a step cheap jobs skip — fitting a nice new window into rotten surrounding timber. We check the structure and tell you what we find, even when it complicates the job.

Questions

Frequently asked

Can uPVC windows be fitted into timber openings?

Yes — the old frame comes out, the surrounding structure is checked for rot, any rot is addressed, then the new frame is seated true, fixed securely, and sealed.

What if the surrounding timber has rotted?

It has to be dealt with before fitting — putting a new window into rotten timber defeats the purpose. We'll tell you what we find.

Is replacing timber with uPVC straightforward?

Usually, but the surrounding structure decides it. We check rather than assume.

From our range

What we make

uPVC Sliding Windows

Multi-track windows that need no swing space.

uPVC Casement Windows

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

uPVC Performance Systems

Double-glazed acoustic and thermal windows.

Related Guides

You might also need

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

Talk to the maker, not a middleman

Tell us your openings and we'll measure on site, advise, and give you a real quote — factory-direct from our Pannimadai works in Coimbatore.