How Much Do Sash Windows Cost in the UK?

by | Sep 22, 2025 | Windows

Introduction
If you’re considering new sash windows, one of the first questions you’ll ask is: “How much do they cost?” The truth is, sash window prices vary widely depending on materials, glazing, customisation, and installation needs. In this guide, we’ll walk through the key cost factors, provide realistic UK price ranges for 2025, and explain why choosing quality matters for long-term value.

Average Cost of Sash Windows in the UK (2025)

Here’s a general breakdown of current sash window prices in the UK:

  • Supply only (standard timber sash window): £1,000 – £1,500 per window
  • Supply & installation: £1,500 – £2,500 per window
  • Conservation-approved or listed building replicas: £2,500 – £4,000+ per window

👉 Note: These are guide prices only. Every property is unique, and final costs depend on survey results and your specific requirements.

Key Factors That Affect Cost

  1. Type of sash window
    • Single-hung: Lower cost, only one moving sash.
    • Double-hung: Both sashes move, offering ventilation but costing slightly more.
    • Bay or curved sash windows: Premium designs requiring bespoke joinery.
  2. Material & Timber Choice
    • Accoya®: Premium timber with a 50-year guarantee; more expensive upfront but highly durable.
    • Redwood or Laminated Timber: Mid-range, with 30-year protection against rot/warping.
    • Hardwoods like Oak: Cost more due to strength and heritage authenticity.
  3. Glazing Options
    • Standard A-rated double glazing is most common.
    • Slimline double glazing may be required in conservation areas (higher cost).
    • Acoustic or laminated glass adds to price but reduces noise/security concerns.
  4. Heritage & Conservation Requirements
    • Exact replicas for listed buildings must match original detail (horns, profiles, putty lines).
    • Planning permission and specialist craftsmanship increase costs.
  5. Installation Complexity
    • Straightforward replacement in modern homes = lower cost.
    • Older or listed homes with structural issues = higher cost.
    • Access challenges (scaffolding, upper floors) also add to pricing.

Cost Comparisons: Timber vs uPVC

Many homeowners weigh up timber vs uPVC sash windows.

  • uPVC sash windows: £600 – £1,200 per window (cheaper upfront, limited lifespan, less authentic).
  • Timber sash windows: £1,500 – £3,000+ per window (more expensive, but durable, sustainable, and authentic).

👉 If you live in a period property or conservation area, timber is almost always required.

Long-Term Value: Why Quality Matters

While uPVC may look like the budget-friendly option, consider the long-term economics:

  • Timber sash windows (like those from TWCC) can last 50+ years with proper care.
  • uPVC often needs replacing after 15–20 years.
  • Timber retains heritage authenticity, protecting your property’s market value.

Over decades, investing in quality timber windows may actually save money.

The TWCC Approach to Pricing

At The Traditional Window & Conservatory Company, we believe in transparency and craftsmanship:

  • Every project starts with a bespoke survey report outlining observations, design ideas, and detailed costs.
  • Prices are itemised — no hidden extras, no “limited-time discounts.”
  • We guarantee long-lasting value with:
    • Accoya® timber (50-year guarantee).
    • Micro-porous paint finishes (7–10 years).
    • Hardware guarantees (10 years).
    • Workmanship guarantee (10 years).

How to Budget for Sash Windows

When planning your sash window project:

  • Get multiple quotes (but compare quality, not just price).
  • Factor in additional services: planning applications, bespoke glazing, or conservation compliance.
  • Consider energy savings: high-quality glazing can reduce heating bills.
  • Think long term: A higher upfront cost often means better durability and fewer replacements.

Final Thoughts

Sash windows are more than just a purchase — they’re an investment in your home’s character, comfort, and value. In the UK market, expect to pay £1,500–£2,500 per sash window installed, with conservation replicas costing more. While uPVC may seem cheaper, quality timber sash windows provide authenticity and longevity that pay off over time.

If you’re considering new sash windows, request a survey report from TWCC. With over three centuries of craftsmanship and a reputation for excellence, we provide clarity, quality, and confidence at every step.