RW Sash Windows

Secondary Glazing

Internal secondary glazing that improves insulation and reduces street noise for period homes, fitted to preserve original sash windows and architectural character.

Secondary Glazing Done Right

Every secondary glazing installation starts with a free on-site survey and a clear three-step plan. We measure original sashes, recommend timber or slimline aluminium secondary panes, then manufacture and fit bespoke internal units that boost insulation and cut street noise while leaving original glazing untouched. Installations are reversible, sympathetic to conservation areas, and finished with draught-sealing and a workmanship warranty for lasting performance.

Secondary Glazing Done Right

How It Works

01

Free Survey & Plan

We inspect each sash, assess frame condition and acoustic needs, then present a clear, written proposal that suits conservation requirements.

02

Bespoke Manufacture

Profiles are made to measure in timber or slimline aluminium, matched to your property and built for easy removal if required by listed building rules.

03

Fit, Seal & Final Checks

We install internal units, fit brush seals and vents where needed, complete airtight sealing, and carry out a final performance and finish check.

Why Choose us for Secondary Glazing?

Conservation Friendly Craftsmanship

Work is tailored to period sash windows and conservation areas, preserving original glazing while delivering modern thermal and acoustic gains.

Free On‑Site Survey and Practical Advice

A no‑obligation survey identifies the best secondary glazing system for your property, with clear guidance on listed building or conservation considerations.

Family‑Run Experience and Guaranteed Workmanship

40 years of joinery experience, bespoke timber options and a workmanship warranty give long‑term peace of mind for sensitive heritage projects.

Systems that respect period character. Secondary glazing offers an alternative internal solution for Georgian terraces, Victorian townhouses and period flats across Manchester. Choose slimline aluminium for minimal sightlines, or timber frames to match existing joinery. Acoustic laminates and sealed cavities reduce traffic and tram noise, while thermal performance improves without replacing original single panes.

Reversible and low impact. Installations are designed to be removable so original frames and glass remain unaltered for conservation records or future restoration. Units are easy to clean from the inside, use brush seals to cut draughts and can include trickle vents for ventilation. Book a free survey and we will recommend secondary glazing or double glazing depending on the sash condition and conservation advice.

Frequently Asked Questions

No. Secondary glazing is fitted internally and designed to be as unobtrusive as possible. We offer slimline profiles and timber options matched to existing mouldings so external appearance and architectural detail remain unchanged.

Protect Your Sashes, Keep Their Character

Arrange a free survey across Manchester and surrounding towns. Call 0161 399 2643 to book a visit and get practical, conservation‑minded advice.
Book a Free Survey
RW Sash Windows - Secondary Glazing Specialists