Secondary glazing in Portsmouth
From £350
| Service | Typical price in Portsmouth |
|---|---|
| UPVC double glazed windows | £464 - £927 |
| Sash windows (UPVC & timber) | £927 - £2,472 |
| French & patio doors | £1,339 - £3,296 |
| Bay & bow windows | £1,648 - £3,914 |
| Secondary glazing | £361 - £979 |
Secondary glazing for Portsmouth’s listed and seafront homes
Between the naval dockyard, the M275 corridor and the heavy traffic along the seafront, Portsmouth has one of the densest concentrations of noise-affected homes on the south coast. Secondary glazing is the option Portsmouth City Council conservation officers most often accept where a sash replacement would be refused, and Legacy Windows matches you with three specialists who quote a fixed price on the same brief.
Why locals in Portsmouth choose Legacy Windows
- Typical 2026 pricing runs from around £360 for a small horizontal slider to £980 for a full-height vertical unit, calibrated to Portsmouth trade rates.
- Slim aluminium frames fit inside the original reveal, meaning no change to the outside elevation and no Listed Building Consent in most conservation cases.
- Acoustic laminated glass options cut traffic and dockyard noise by up to 45 dB, tested to BS EN ISO 10140.
- Thermal performance on a retained single-glazed sash improves from around 4.8 to 1.8 W/m2K, meeting Part L for retained fabric.
- Public liability insurance and a workmanship warranty of at least ten years is standard across our Portsmouth panel.
Areas we cover around Portsmouth
Secondary glazing briefs are heaviest in PO1 across Old Portsmouth, PO5 in Southsea and along the seafront, and PO2 near the M275 approach. Old Portsmouth and the Southsea Regency terraces make up the majority of the twenty-three conservation areas where secondary glazing wins over replacement. Requests from Gosport, Havant and Fareham are handled by the same Hampshire specialists.
Frequently asked questions
Does secondary glazing work against seafront wind noise as well as traffic? Yes. A 100 to 150 mm cavity between the primary sash and the secondary pane, with 6 mm acoustic laminated glass on the inner unit, cuts most low-frequency wind noise as well as passing traffic. It is a common specification along Clarence Esplanade.
Do I need Listed Building Consent for secondary glazing in Old Portsmouth? Usually no, because the original frame is left in place. Portsmouth City Council conservation officers often actively recommend secondary glazing on Georgian and Regency stock for exactly that reason. A quick call to the conservation team confirms whether consent is needed on your street.
Can secondary glazing be removed cleanly if I sell the house? Yes. Aluminium secondary units are fitted to the surrounding reveal, not the original frame, and remove without damage to the sash.
Windows and doors in Portsmouth - local context
Terraced streets across Southsea and Fratton, Victorian villas in Old Portsmouth, plus postwar rebuild in the docks area after heavy WWII bombing.
Dominant era of housing stock: Victorian to Edwardian, plus significant postwar reconstruction.
Heritage note: 23 conservation areas including Old Portsmouth and Southsea.
- Southsea
- Old Portsmouth
- Cosham
- Drayton
- Milton
Postcodes we cover in Portsmouth
- PO1
- PO2
- PO4
- PO5
- PO6
Not seeing your postcode? Request a quote anyway - we likely still cover it.