Sash windows in Portsmouth
From £900
| 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 |
Sash restoration in Portsmouth’s Regency and Victorian streets
The Regency squares of Southsea and the Georgian survivors around Old Portsmouth carry some of the finest sash window stock on the south coast, and every box is a slightly different width. Legacy Windows introduces homeowners to sash specialists who quote a fixed price to either restore the original box with slim double glazing or fit a full timber replacement to the same profile.
Why locals in Portsmouth choose Legacy Windows
- Typical 2026 pricing sits between £925 and £2,470 per sliding sash supplied and fitted, calibrated to Portsmouth trade rates and coastal joinery premiums.
- Slim 12 to 14 mm double-glazed units let installers reach Part L Uw of 1.4 W/m2K without altering the sightlines that Portsmouth City Council conservation officers protect.
- Original glazing bar profiles, meniscus glass and horn detailing are matched to the Historic England guidance for pre-1919 stock.
- Draught-proofing brush seals, modern spiral balances and acoustic laminated glass options are offered as line items, so you compare on the same brief.
- The service is comparison-only: three sash quotes, no doorstep visits until you invite one.
Areas we cover around Portsmouth
Sash briefs concentrate in PO1 (Old Portsmouth), PO5 (Southsea) and pockets of PO4, with a steady flow from Havant, Gosport and Emsworth. Old Portsmouth and Southsea together account for most of the twenty-three conservation areas in the city, and Listed Building Consent applies to any street-facing change on the Georgian and early Victorian stock. Our Hampshire joinery workshops handle both restoration and full replacement briefs.
Frequently asked questions
Can I install slim double-glazed sashes in Old Portsmouth? Usually yes, provided the glazing bar layout, horns and profile match the original. Portsmouth City Council’s conservation team generally accepts slim units at 12 to 14 mm on Georgian frontages. Full 24 mm units on the street elevation are almost always refused.
Is Listed Building Consent required for sash restoration? Yes if the building is listed, whether the work is inside or outside. In practice a like-for-like restoration with matched glass and profiles is usually approved. Southsea Regency terraces are the strictest, and consent typically takes six to eight weeks.
What is the difference between spring balance and weight-and-pulley? Weight-and-pulley suits period restoration and preserves original detail. Spring balance is quieter, easier to service and lets the box be shallower on modern replacements. Both are offered by our matched joiners.
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.