• Showroom & Head Office

    01923 231 111


Say goodbye to the 45° corner welds for good with our innovative new timber look corners!

February 1, 2016 by harp_admin

logo diamond

FAB NEW TIMBER LOOK CORNERS ON OUR EVOLUTION WINDOWS MAKE IT EVEN HARDER TO SPOT THAT THESE STUNNING WINDOWS AREN’T REALLY WOOD! We’re really excited about this latest innovation from Evolution! Gone are the telltail 45° corner heat weld marks that are so characteristic of your average uPVC window!

WELDS 750 Storm & Timberlook

Original discreet 45° weld marks on the exterior vents of an Evolution Storm 2 window (left) compared with the new innovative timber-look corners.


Woodgrain effect foils have got so good now that it can sometimes be difficult to tell if a profile is uPVC, until you touch it, that is. However if there was one sure giveaway sign that a window was uPVC it was always the 45° corner heat weld marks that could be found all across the vents and joints. You simply don’t get these on a genuine timber window. Customers love the look of timber but don’t want the maintenance issues. uPVC offered woodgrain foils, but it still didn’t look like a genuine timber window.

Enter Evolution Manufacturing, with the ground breaking STORM timber replacement window. Evolution took on board the differences in construction between a uPVC window and a timber window, and worked hard to create a new window that embraced the age old techniques of wood, but with all the benefits of uPVC. It wasn’t always easy but with hard work and innovation they created the STORM window which took the humble uPVC window to brand new heights. Now, combining the aesthetics of a hand finished mechanical construction timber window with exceptional energy performance meant that customers could finally have a uPVC window that really could give a genuine timber window a run for its money!

750 EVO storm interior

Interior of an Evolution window. The mechanical construction looks much more like the aesthetics of a genuine timber window than your average uPVC window does.


It wasn’t long before Evolution were busy working on their next innovation – the Flush window. Once again, this window replicated a genuine timber window like no other. Flush fitting casements that looked just like wood but with all the benefits of uPVC were now possible, and our customers were loving it!

750 EVO FLUSH dual

Fab looking Flush casements with very discreet 45° weld marks to the corners of the vents.


Now, we can finally kiss goodbye to the 45° corner weld altogether with the introduction of the brand new timber-look corners. This subtle but ground breaking design feature has taken the Evolution timber alternative window to even dizzier new heights!

WELDS 750 Rehau & Timberlook

COMPARE THE CORNERS: Our standard Rehau uPVC window (left) and the Evolution Storm timber alternative window (right).

Contact us at our showroom in Bushey Arches if you’d like to find out more about our Evolution timber alternative windows and doors, or check out our brochures and video page where you can download our latest Evolution brochures.


Endorsements & Reviews

Watch Our Videos

Window unit replacement to a sash

10 Verified Review

Fantastic service from beginning to end. Local showroom in Watford with a super variety of windows and doors The fitment of the sash for my son's bedroom, best decision. Quality window and beautiful finish Paul and Miles are polite and friendly. Paul is a master at his job and Miles is super when finishing and completion. Thanks guys and thank you Harp Windows

Location: WD25September 2023

Replacement front door

10 Verified Review

All appointments on time. Advice useful when choosing design. Fitted in less time than expected.

Location: WD23August 2023

Bay Window Replacement

10 Verified Review

I have to say I have been impressed with HARP from start to finish. I was guaranteed the best price from John at the beginning, There was no hard sell or tricks, Just simple and honest. I ordered 1 window to replace my old bay which I was advised would take 6 weeks from ordering. My window arrived slightly earlier than anticipated and was fitted without delay. The fitting team worked in a clean and tidy manner, were punctual and had a great attention to detail.

Location: WD24July 2023

Supply rear door.

10 Verified Review

Excellent service, most helpful and friendly. Highly recommend.

Location: BH10May 2023

2 x casement windows

10 Verified Review

Very pleased with product and workmanship. All done with no fuss and no mess. Brilliant job. Billy even hoovered up afterwards !

Location: WD18May 2023

New windows and doors

10 Verified Review

Excellent service from both the showroom staff and the fitting team . Quality of the windows and doors is very good , and would highly recommend this company

Location: WD24April 2023

Read all 250 reviews

  • Harp Windows (Watford) Ltd
  • 91-93 St Albans Road
  • Watford
  • Hertfordshire
  • WD17 1UL



Copyright Harp Windows. All rights reserved

Designed by Npwebservices Limited