How Much Do New Windows Cost in London & Croydon in 2026? (Full Price Guide)
If you've started researching new windows for your home, you've probably noticed something frustrating fast: almost no supplier will give you a straight answer on price without a home visit. That's partly because window costs genuinely do vary a lot by size, material, and style — but it also means homeowners in London and Croydon are left guessing when trying to budget for the project.
This guide gives you realistic, current price ranges for the most common window types fitted across London and Croydon, explains exactly what drives the cost up or down, and helps you figure out what to budget before you request a quote.
Average Window Costs in London & Croydon (2026)
Prices below are per window, supplied and fitted, for a standard-sized opening. Larger or bespoke shapes will sit above these ranges.
| Window Type | Typical Price Range (Supplied & Fitted) |
|---|---|
| UPVC casement window | £450 – £850 |
| UPVC sash window (traditional style) | £700 – £1,200 |
| Aluminium casement window | £750 – £1,400 |
| Aluminium sliding window | £900 – £1,700 |
| Composite/hybrid window | £800 – £1,500 |
| Bi-fold or panoramic sliding door | £2,500 – £6,000+ |
For a typical 3-bedroom semi-detached home in London or Croydon needing 8–10 windows replaced, most homeowners budget somewhere between £5,500 and £11,000 for a full UPVC replacement, or £8,000 to £16,000+ for aluminium across the whole property.
These figures are a starting point, not a quote — the only way to get an accurate number for your home is a free, no-obligation site visit, which is why most reputable installers (including us) don't charge for this step.
What Actually Affects the Price of New Windows?
Understanding what drives cost up or down helps you budget realistically and spot quotes that seem too good to be true.
1. Frame Material
UPVC is the most budget-friendly option and performs well thermally. Aluminium costs more upfront but offers slimmer frames, a more contemporary look, and excellent durability — a common choice for London period conversions and new-build extensions. Composite doors and windows sit in between, blending timber-look aesthetics with lower maintenance.
2. Glazing Type
Standard double glazing is the baseline for most UK homes. Triple glazing costs 15–25% more per window but delivers noticeably better heat retention and noise reduction — worth considering for homes near busy roads (common across much of Croydon and inner London).
3. Window Style
Simple casement windows are the most cost-effective. Sash windows, bay windows, and bi-fold or sliding doors involve more complex manufacturing and installation, which increases price.
4. Size and Number of Openings
Larger openings and full-height glazing (increasingly popular for garden rooms and rear extensions) cost more per square metre than standard-sized windows.
5. Access and Installation Complexity
Upper-floor windows, listed buildings, or properties with restricted access (common in terraced housing across London) can add to labour costs.
6. Energy Rating
A-rated and A++-rated windows cost slightly more than lower-rated equivalents but reduce heating bills over time — an increasingly important factor given current UK energy prices.
UPVC vs Aluminium: Which Costs Less Long-Term?
While UPVC has a lower upfront cost, it's worth thinking beyond the initial price:
UPVC typically lasts 20–25 years with minimal maintenance and offers strong thermal performance at the lowest price point.
Aluminium costs more initially but lasts 30–40+ years, holds its finish better, and suits larger glazing spans without the frame bulk UPVC requires at scale.
For homeowners planning to stay long-term, aluminium's higher upfront cost is often offset by its lifespan and lower long-term maintenance. For shorter-term ownership or budget-focused projects, UPVC remains the more cost-effective choice.
Are There Grants or Financing Options Available?
Several UK homeowners qualify for support that can reduce the effective cost of window replacement:
ECO4 scheme — available to eligible low-income households or those receiving certain benefits, covering some or all of the cost of energy efficiency improvements including glazing.
Flexible payment plans — many installers, including Energy Star Homes, offer staged or financed payment options to spread the cost of larger projects.
It's worth asking directly during your free quote whether your property or circumstances qualify for any current scheme, since eligibility criteria change periodically.
How to Get an Accurate Price for Your Home
Online price guides (including this one) are useful for budgeting, but the only way to get a number you can actually rely on is a site visit — because the exact cost depends on your specific window sizes, wall type, access, and finish choices.
At Energy Star Homes, we provide free, no-obligation quotes across London and Croydon, with no pressure sales tactics — just an honest assessment and a clear price. We supply and fit premium UPVC, aluminium, and composite windows, working with trusted partners including Origin and The Palladio Door Collection to give you genuine choice across price points and styles.
Frequently Asked Questions
How much does it cost to replace all the windows in a 3-bed house in London?
Most homeowners budget between £5,500–£11,000 for UPVC across a full 3-bedroom property, or £8,000–£16,000+ for aluminium, depending on window count, size, and style.
Is it cheaper to replace all windows at once or one at a time?
Replacing all windows in one project is almost always cheaper per window, since it reduces the number of separate site visits, scaffolding/access setups, and labour mobilisation costs.
Do new windows increase home value?
Yes — modern, energy-efficient windows are consistently cited by UK estate agents as a factor that improves both kerb appeal and EPC ratings, which can positively affect resale value.
How long does window installation take?
A standard home (8–10 windows) typically takes 1–3 days to complete, depending on window style and property access.
Do I need planning permission for new windows?
Most window replacements fall under permitted development and don't require planning permission — the main exception is listed buildings or properties in conservation areas, where specific rules may apply.
Get an Accurate, No-Obligation Quote
Skip the guesswork — get a free, honest quote based on your actual property and requirements.
Call: 07804 623910 | Email: info@energystarhomes.co.uk | WhatsApp Us — Available 7 days a week across London & Croydon.
