Insert Replacement
New uPVC units fitted into your existing frame, draughts and misting fixed without touching the outside finish.
What Goes Wrong
The insert method only works when the frame is properly assessed first, skipping that step causes the same problems to return.
Fitting a new unit into a rotten or out-of-square frame means the window will stick, leak, or fail to seal within months.
The installer checks for rot, movement, and sill condition before confirming the approach or taking any measurements.
A unit set without shims and proper caulking leaves gaps at the perimeter, letting draughts back in through the new frame.
The new vinyl unit is shimmed level and square, fixed through the jambs, and the full perimeter sealed airtight with weatherproofing caulk.
Removing cladding or siding unnecessarily adds cost, extends the job, and risks damage that is difficult to make good afterwards.
The old sashes are removed and the new unit fitted entirely from inside the opening, the exterior cladding is never touched.
Being given only a full-frame price when an insert replacement would do the job means paying for work that was never necessary.
Where the frame is sound, the written quote sets out the insert and full-frame alternatives so you can compare before deciding.
Scope of Work
From a single misted unit to a room-by-room update across an older semi or terrace.
A new vinyl unit is fitted into a sound uPVC or timber frame using shims and sealant, no cladding removed.
Where only the double-glazed unit has failed, the misted glass is swapped out without disturbing the surrounding frame or trim.
Perimeter caulking and weathersealing are renewed to eliminate cold air ingress around the frame and sashes.
Each window is treated as a self-contained job, so you can update one room at a time without committing to the whole house.
Existing uPVC frames assessed for rot, level, and plumb.
Wood frames checked before any vinyl unit is ordered.
Beads and trim stops close the gap between old frame and new unit.
Old sashes and glazing units removed and taken away.
Insert Fit, Less Disruption
The insert method works when the existing frame is structurally sound, the installer checks that before anything is measured or ordered.
Much of Havering’s 1960s to 1980s housing stock has original double glazing now reaching the end of its lifespan. Where the outer uPVC or timber frame is still level, plumb, and free from rot, the insert replacement method avoids the disruption of a full frame removal. The installer checks the frame condition first, looking for rot, movement, and whether the sill is still sound, before confirming the approach.
The old sashes or glazing units are removed from inside the opening. The new vinyl unit is set into the existing frame, shimmed for level and square, and fixed through the jambs. Glazing beads and trim stops are fitted to close the gap between old frame and new unit, and the full perimeter is sealed with caulk to eliminate draughts. The exterior cladding or siding is not touched at any stage.
Room-by-room replacement is common among Havering homeowners updating older semis and terraces, and the insert method suits that approach well, each window is a self-contained job. Where the frame inspection reveals rot or significant movement, the installer will set out the full-frame alternative in the written quote so you can compare both options before deciding.
Why Choose Us
We connect customers with vetted independent local installers who know the borough’s housing stock and work to a clear, written process.
A local installer visits the property to record frame condition and glazing before a single measurement is taken or unit ordered.
The written quote covers glass, frames, labour, and waste removal, broken down line by line so you know what you are paying for.
Where both approaches are viable, the quote sets them out together so you can make an informed decision before work begins.
Work is planned to keep time on site short, which matters when you are updating a room at a time rather than the whole house at once.
Our trusted partners work regularly with the timber and uPVC frames found across Romford, Hornchurch, and the wider borough.
How It Works
01
Describe the symptoms, draughts, misting, sticking, and we arrange a local installer to visit the property for a free on-site survey.
02
The installer assesses frame condition, confirms the right approach, and returns a written itemised quote covering all materials and labour.
03
The new vinyl unit is fitted, shimmed, sealed, and trimmed, with old glazing removed from site and the surrounding finish left intact.
Pricing Estimates
| Job | Typical cost | Typical duration |
|---|---|---|
| Single uPVC casement window | £495-£930 | 2-3 hours |
| Flush uPVC casement window | £650-£1,400 | 2-3 hours |
| uPVC sash window | £900-£1,800 | Half day |
| uPVC bay window | £1,490-£3,730 | 1 day |
| Whole-house uPVC replacement | £4,350-£11,000 | 1-3 days |
Tell us the symptoms and the property type. We arrange a local installer to survey the windows and return a written quote before anything is ordered. There is no charge for the survey or the written quote.