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OMNIA uPVC windows give you slim sightlines, strong thermal performance, and advanced security in a true double-flush profile. Available locally through our Lancashire team, specified for today and ready for future regulations.

Design

Slim. Flush. Consistent.

The OMNIA profile delivers a clean, double-flush look inside and out. Timber-style corner detailing suits period homes; modern trims suit contemporary builds. Use one consistent aesthetic across casement, tilt & turn, French doors, bays, and residential doors.

• Double-flush inside and out
• Timber-style corner detail
• More glass, less frame for light

Performance

Comfort that’s built in

OMNIA is engineered for thermal and acoustic performance. With suitable glazing, U-values can reach 0.79 W/m²K (triple) and around 1.2 W/m²K (double). Double rebates improve weather protection. Quality hardware keeps operation smooth.

At-a-glance:

• U-values from 0.79 W/m²K (spec-dependent)
• Double-rebated frames for weather resistance
• Compatible with premium hardware

Independent verification

Tested and certified

OMNIA meets recognised standards for weather, security and thermal performance, including BS 6375 (parts 1–3) and PAS 24. With the right glazing, specifications can deliver U-values from 0.79 W/m²K for compliance-led projects.

Badges

• BS 6375-1/2/3 (weather)
• PAS 24 (security)
• From 0.79 W/m²K (thermal)

One look across the whole home

Applications

Use the same profile across townhouses, cottages, new builds and refurbishments. Keep a unified look with matching windows and doors installed by a local team that understands North West property styles.

Casement, tilt & turn, bays, outward-opening French doors, and residential doors.

Popular colours, modern textures

Colours and finishes

Choose from light and earthy tones, dark modern shades, and timber-effect finishes. Options include Claystone, Agate Grey, Cream, Chartwell Green, Pebble Grey, Anthracite Grey (grained or smooth), Beck Brown, Ulti Matt Black, Irish Oak, Sage Green, and Ginger Oak. Swatches recommended before ordering.

Note: Full made-to-order selection available; colours shown are indicative.

Key specifications

Quick spec

• Frame depth: 70 mm
• Profile style: True double-flush (inside & out)
• Seals: Co-extruded PCE gaskets
• Weathering: Double-rebated design
• Security: PAS 24-ready specification
• Thermal: From 0.79 W/m²K (glazing-dependent)
• Mullions: Invisible mullion option
• Jointing: Mechanical jointing compatible

Fabrication details that matter

Made for precise builds

OMNIA incorporates details that speed up production and keep finishes consistent—useful for one-off homes and multi-plot sites our team supports across the North West.

Feature list:

• Rider block mechanism for faster assembly
• Invisible mullions for a clean, uninterrupted look
• Mechanical jointing compatibility
• 70 mm frame depth for straightforward upgrades
• Multiple bead options for style matching
• Double rebates for added protection
• Co-extruded PCE gaskets for consistent sealing

French-style flush sash uPVC windows in a traditional Blackburn cottage interior

What Should You Know Before Choosing OMNIA?

Got questions about OMNIA windows? This section covers performance (U-values), security (PAS 24), styles, colours, installation, and aftercare. If you don’t see what you need, drop our Lancashire team a line for clear advice and a quick quote.

Get a Quote for uPVC Windows in Blackburn

What U-values can OMNIA achieve?

With triple glazing, down to 0.79 W/m²K. With double glazing, around 1.2 W/m²K, subject to glass unit choice.

Is OMNIA suitable for refurbishments?

Yes. The 70 mm depth supports like-for-like upgrades with minimal disruption.

How does OMNIA handle weather?

The double-rebated design improves resistance to wind and rain for long-term reliability.

What security options are available?

OMNIA is designed to meet PAS 24 when combined with compatible hardware and glazing.

Which styles are available?

Casement, tilt & turn, bays, French doors and residential doors, all using the same double-flush profile.

Full house installation with flush sash windows

Very good communication and very professional company. High standard fitting of front door. We had a couple of little issues but they
responded and resolved them promptly and efficiently.

Kirsty Imie

August 28, 2025

Fantastic customer service. Very helpful in advice on the various products offered, how the cost would be affected. We were kept informed
throughout process even down to a reminder a few days prior to installation. The installation process was clean and efficient.

Mr Rifai.

August 28, 2025

Excellent communication throughout both in person and electronically. Lovely team fitting and install. Very happy with the finished product

Gary Lane

August 28, 2025

“I found GWH Windows an excellent company to deal with. The staff were very friendly and easy to deal with. The installation staff were very experienced and did and excellent job. I would recommend them to anyone.”

Mr Nuttall - Burnley

July 31, 2025

“Very efficient from start to finish, great company, I would highly recommend them to anyone wanting replacement doors and windows etc. I will be using GH Windows again for a roof lantern”

Mr Inge - Accrington

July 31, 2025

“We replaced our old wooden porch and door through Great Harwood windows. The whole experience was extremely good. Couldn’t fault the fitters Scott and Sam who were very professional and paid a lot of care to detail. Very tidy. Reasonable price.”

Mrs Wroe - Clitheroe

July 7, 2025

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Get in Touch

Based in the heart of Lancashire

Situated in the very heart of Blackburn, we are readily capable of providing the people of East Lancashire and surrounding areas with a range of UPVC, composite and aluminium products. Whether for personal or trade purposes, realising your aspirations are only one step away with Great Harwood Windows team.