Aperture Precision — field of expertise
Every window. Every door. Every specification —
processed correctly, first time.
25+ years of fenestration industry experience. Available to manufacturers and suppliers who need a reliable, expert processing specialist — without the cost and complexity of a permanent hire.
An experienced processor prevents errors before they reach production.
One prevented remake typically covers several days of support fees.
Aperture Precision — field of expertise
Every window. Every door. Every specification —
processed correctly, first time.
My name is Darryl Haggan. I've spent over 25 years in the uPVC fenestration industry — starting on the factory floor and progressing into specialist order processing and quoting roles across retail and new build commercial. I know what happens downstream when a spec is wrong, because I've seen it from both sides.
That factory-floor foundation is what separates experienced processing from box-ticking. I understand profile behaviour, weld tolerances, glass unit sizing, and hardware compatibility — not just what to type into the system. I launched Aperture Precision to make that depth of expertise available to manufacturers and suppliers without the cost and commitment of a permanent hire.
Whether you need help with everyday quoting, overflow cover during busy periods, or someone to step in for a colleague on holiday, I can integrate quickly and get to work with minimal disruption.
Professional insurance
Professionally insured through PolicyBee
Professional indemnity and public liability insurance in place — full details available on request.
"Every opening, exactly right."
Aperture Precision — Darryl Haggan
"I have had the pleasure of working alongside Darryl for the past eight years and cannot speak highly enough of his professionalism and work ethic. He possesses an outstanding track record in tendering and order processing, where his remarkable accuracy and attention to detail always stands out."
— Nick Powder, Fenster UK
— Six core service specifications —
End-to-end processing of uPVC window and door orders, handled accurately and efficiently from initial enquiry through to confirmed order.
Precise, professional quotations for retail customers and new build commercial clients. Experienced across both sectors.
When your order book grows faster than your team, I provide reliable additional capacity to keep things moving without missed deadlines.
Simple, no-fuss cover when your processing team is on leave — so your customers never notice the gap.
Pre-production compliance checks against Part F (trickle vents), Part L (U-values), Part Q (security) and M4 accessibility requirements — flagging non-compliant specs before they reach the factory floor. Already up to date on Future Homes Standard requirements ahead of the 2027 implementation.
No long-term contracts required. Work with me on a project, retainer, or ad-hoc basis — whatever suits your business.
Indicative rates — no minimum commitment
Ready to discuss your requirements?
No obligation — just a conversation about what you need.
Initiate
Get in touch
Drop me an email or call — tell me what you need and when
Assess
Brief call
Quick conversation to understand your system and requirements
Access
System setup
Access granted — up and running with minimal onboarding
Execute
Processing begins
Accurate orders and quotes turned around to your schedule
Deliver
Problem solved
Your desk runs smoothly — no errors, no delays, no stress
Factory Floor to Processing Desk
25+ years in fenestration — starting on the factory floor means I understand profile behaviour, weld tolerances, and downstream consequences. Processing experience alone doesn't give you that.
Ready Immediately
Extensive Window Designer experience and Business Micros exposure means minimal onboarding time. No hand-holding required — I hit the ground running.
Regulatory Compliance Built In
Every order is checked against current building regulations — Part F ventilation, Part L U-values, Part Q security, and M4 accessibility requirements. Compliance errors are identified and flagged before they become expensive remedials or liability issues on site.
No Commitment Required
No long contracts, no recruitment fees, no employment obligations. Experienced support exactly when you need it — and nothing more when you don't.
From single retail quotes to large-scale residential schedules —
handled with equal precision.
System access
How do I give you access to our system securely?
Most clients use remote desktop (RDP), TeamViewer, or a VPN connection. I've used all three and can work with whatever your IT setup supports. We agree the access method before we start and you can revoke it instantly at any time.
Software
Which version of Window Designer do you work with?
I have extensive experience across multiple versions of Window Designer. I also have solid Business Micros exposure. If you use a different system, let me know — I'm happy to discuss whether it's something I can support.
Turnaround
What's your typical turnaround on a quote?
That depends on the complexity and volume agreed at the start of the engagement. For most retail quotes I work to your existing turnaround expectations. For new build schedules we agree a production timeline upfront. I work to your deadlines, not my own.
Errors
What happens if there's a processing error?
I carry professional indemnity insurance for exactly this reason. My focus is preventing errors before they reach production through careful specification checking — but if something does go wrong, we address it immediately and professionally. Full details are in my Terms & Conditions.
Commitment
Do I have to commit to a long-term contract?
No. You can engage me on an ad-hoc hourly basis, a day rate, or a monthly retainer — whichever suits your needs. There are no minimum commitments on ad-hoc work and retainer arrangements require only 30 days written notice to end.
Getting started
How quickly can you start?
Usually within a few days of our initial call. Once we've agreed scope and I have system access, I can begin processing immediately. There's no lengthy onboarding — 25 years in the industry means I hit the ground running.
Fill in the form and I'll get back to you within a few hours. Or reach me directly — no obligation, just a conversation.