How Much Do
New Windows
Cost?
Realistic pricing for double glazing replacement in Herts, Beds, Bucks & Cambs.
Updated December 2026 • 7 min read
The Quick Answer
A typical double-glazed window costs £400–£800 per window (material + installation). A full house replacement (10–15 windows) typically ranges from £4,000–£12,000 depending on size, type, and complexity. Most customers spend £6,000–£9,000 for a 3-bedroom home.
What Affects Window Cost?
1. Window Type
2. Window Size
Larger windows cost more. A small bathroom window (600mm × 600mm) costs less than a large bay window or patio door. The price scales with glass area and frame material.
3. Frame Colour & Finish
Standard white uPVC is cheapest. Custom colours (grey, black, cream) add 10–20% to the cost. Wood-effect finishes add 15–30%.
4. Glass Upgrades
Low-emissivity (Low-E) glass improves energy efficiency and costs £50–£150 extra per window. Acoustic glass for noise reduction adds £200–£400 per window. Tinted or privacy glass adds £100–£250.
5. Installation Complexity
Simple replacements in existing frames are cheaper. New openings, structural work, or difficult access add labour costs. Multiple flights of scaffolding add to installation cost.
6. Location & Travel
We serve Herts, Beds, Bucks & Cambs. Travel distances within this area are included. Remote postcodes may add a small travel surcharge.
Sample Costs for a 3-Bedroom Semi
Typical installation: 12 uPVC double-glazed windows
Cost Breakdown: Materials vs Labour
Material Costs (55–60%)
- ✓ Window frames & sash
- ✓ Double-glazed glass units
- ✓ Hardware (handles, hinges, locks)
- ✓ Seals, gaskets, insulation
- ✓ Installation fixings
Labour Costs (40–45%)
- ✓ Removal of old windows
- ✓ Frame preparation & levelling
- ✓ Professional installation
- ✓ Sealing & weatherproofing
- ✓ Making good & cleanup
Will New Windows Pay for Themselves?
Modern double-glazed windows are 30% more energy-efficient than old single glazing. Most homeowners save £150–£300/year on heating bills.
Payback Period Example:
Installation cost: £8,000
Annual energy savings: £250
Payback period: 32 years
Note: Most windows last 20–35 years, so you'll enjoy savings well into ownership. Plus: increased home value, improved comfort, reduced noise, and better security.
Energy savings alone justify replacement, but you'll also gain comfort, security, and property value gains. Most customers report the investment was worth it within 7–10 years.
How to Reduce Costs
- ✓Choose uPVC over aluminium — uPVC is 20–30% cheaper and still very durable.
- ✓Standard white finish — Avoid custom colours which add 15–30% to cost.
- ✓Standard double glazing — Skip triple glazing unless you live in a very cold area or want maximum soundproofing.
- ✓Replace in phases — Do critical windows first, others later if budget is tight.
- ✓Get multiple quotes — Compare prices. At Hewitts, we offer competitive rates and honest advice.
What's Included in Our Quote?
When we provide a free quote, here's what it covers:
- ✓ Professional on-site measurement
- ✓ Material & labour costs
- ✓ Installation & making good
- ✓ Removal & disposal of old windows
- ✓ 10-year warranty on workmanship
- ✓ No hidden costs or surprises
Get Your Free Window Quote Today
No obligation. We'll visit your home, measure your windows, and provide a detailed, honest quote within 24 hours. No surprises. No pressure.