Hertfordshire
Bifold proof slot for a Hertfordshire extension
Use this slot for a verified rear-opening project once real photos, specification, location permission and customer wording are available.
Green Property Windows & Doors
Replacement Windows Supplied and Fitted Across London and the Three Counties
uPVC, aluminium and flush-style replacement windows fitted with careful measuring, clean removal and clear advice on ventilation, energy performance and certification.
Survey-led measuring and compliance guidance before ordering.
Survey-led quotes
Supply & fit or fit-only
Compliance route explained
Real project photos
Workmanship terms explained
Quick answer
What to know first
Useful for cold rooms, draughts, failed units, dated frames and refurbishments. We check opener layout, ventilation, safety glazing, sills, trims and access before a final quote.
Options
Designed around your home
uPVC casement
Checked against the opening, product specification and finish details before ordering.
Aluminium windows
Checked against the opening, product specification and finish details before ordering.
Flush casement
Checked against the opening, product specification and finish details before ordering.
Bay windows
Checked against the opening, product specification and finish details before ordering.
Sash-style replacements if suitable
Checked against the opening, product specification and finish details before ordering.
Double or triple glazing if specified
Checked against the opening, product specification and finish details before ordering.
Decision support
uPVC or aluminium windows?
We keep the choice practical: how the opening is used, how the product looks, what it needs to achieve and what route is needed for paperwork.
Not sure? Send photosLower-cost practical replacementuPVC windows
Slimmer modern frame styleAluminium windows
Traditional appearanceFlush or sash-style options
Thermal performanceCheck full product data
Process
From first photos to final handover
1
Photos or plans
A practical step before ordering or fitting.
2
Initial guidance
A practical step before ordering or fitting.
3
Measured survey
A practical step before ordering or fitting.
4
Product specification
A practical step before ordering or fitting.
5
Installation and handover
A practical step before ordering or fitting.
Compliance
Compliance considered before the job starts
We explain the compliance route before you order, not after the job is finished.
Read our certification guideBuilding Regulations route
Checked where relevant and explained in plain English.
Part L energy performance
Checked where relevant and explained in plain English.
Part F ventilation
Checked where relevant and explained in plain English.
Safety glazing
Checked where relevant and explained in plain English.
Pricing factors
What affects the quote?
Number of windows
Confirmed before a final measured quote.
Frame material
Confirmed before a final measured quote.
Opening styles
Confirmed before a final measured quote.
Glazing and vents
Confirmed before a final measured quote.
Colour
Confirmed before a final measured quote.
Sills and trims
Confirmed before a final measured quote.
Access
Confirmed before a final measured quote.
Removal and finishing
Confirmed before a final measured quote.
Project proof
Recent project examples
Greater London
Replacement window proof slot for a brick home
Reserved for a verified window replacement showing ventilation decisions, finish details and the agreed certification route.
London and the Three Counties
Composite front door proof slot
Reserved for a verified entrance upgrade with frame size, threshold, glazing safety and hardware choices documented.
FAQs
Common questions
Do replacement windows need trickle vents?
Many projects need background ventilation. We discuss Part F before ordering.
Do I need a certificate?
The certification route depends on the project and installer status. We explain this before work proceeds.
How long does replacement take?
Small projects may be completed quickly, but number of windows, access and finish details affect time on site.
Can windows be replaced in flats?
Often, but leasehold, access, external appearance and Building Control responsibilities may need checking.
Next step
Send photos, postcode and project details.
We’ll tell you what we need to check, what options are realistic and what compliance route may apply before you order.