Traditional Craftsmanship · Modern Performance

Timber Sash
Windows

Handcrafted timber sash windows for period homes. Design and price your bespoke windows online in minutes — no calls, no waiting.

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✦ Crafted timber sash windows. Designed in real-time.

Interactive Window Configurator

Design and price your bespoke sash windows online in minutes.

Get Your Price Now →
Handcrafted sash windows

About Us

Craftsmanship meets functionality

Welcome to Prime Sash Windows, where craftsmanship meets functionality. We specialize in creating high-quality timber windows that enhance both the aesthetic appeal and energy efficiency of your home.

Serving London and surrounding areas, we bring over a decade of expertise in bespoke timber window manufacturing and installation. As members of The Joinery Network and FENSA registered installers, we offer free site surveys within 25 miles of London.

10+Years Experience
500+Windows Installed
0.8U-Value with Passive Glass
Warm interior with sash windows London

Our Expertise

Traditional Sash Windows

Every window we make follows the traditional method — built from premium hardwood, finished with multiple coats of microporous paint for lasting protection, and balanced exclusively on lead weights. We never use spring balances.

Our lead weights are 100% recycled, keeping the authentic feel and smooth operation of a proper sash window while being environmentally responsible. The result is a window that works exactly as it should — quiet, balanced, and built to last decades.

Why Choose Us

Six reasons to choose Prime Sash

01

Premium Timber

Hardwood, Accoya & Oak. Engineered timber prevents warping. Sourced from sustainable forests.

02

Premium Finishing

Immersed in preprimer, primed twice, topped with finish coat. Sikkens Wood Coatings and Teknos systems.

03

Modern Performance

Slimline double glazing and draught-proofing. PAS24 certified security. FENSA registered.

04

Made in Britain

Sash windows were invented in Britain over 350 years ago — and this is still the only place in the world where they are manufactured to the highest standard. Our windows are designed, built, tested and certified in the UK. Not imported. Not assembled from parts made elsewhere. Proudly British-made.

05

In-House Workshop

Every window handcrafted in our workshop near London and installed by FENSA-certified installers.

06

Comprehensive Warranty

Insurance-backed warranty and dedicated customer service team. Part of Skylon Group.

"Our windows are engineered for exceptional airtightness and energy efficiency, significantly reducing heat loss without compromising traditional appearance." — Prime Sash Windows, London
Handcrafted excellence

Technology

Passive Glass Technology

Traditional double glazing achieves a U-value of around 1.4 W/m²K. With Passive Glass, our windows reach U-values as low as 0.8 W/m²K — a dramatic improvement for overall building energy performance.

For architects struggling to meet SAP calculations or Part L compliance on heritage projects, this is a game-changer. No compromise between conservation requirements and energy targets.

0.8U-Value W/m²K
50%Better than standard
Part LCompliance Ready

How It Works

Four steps to your new windows

01

Configure Online

Use our interactive configurator to design and price your windows. No calls, no pressure.

02

Free Survey

We visit your property to take precise measurements and discuss your requirements in detail.

03

Production

Hand-crafted in our workshop near London. Quality-checked at every stage. 8–12 weeks production.

04

Installation

Our FENSA-certified team installs your windows with minimal disruption. Guaranteed quality.

FENSA Certified PAS24 Security Lignum System The Joinery Network Made in Britain