Craftsmanship
Every installation is an exercise in precision. We measure twice, cut once, and obsess over the details that most people will never notice — because we will.
About
Built on craft.
Proven over 25 years.
From a family glazing business on Allerton Road to Liverpool's most trusted name in luxury windows and doors — this is our story.
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01
“We never set out to be the biggest — just the best on every job we touch.”
Founding principle
Our Story
Allerton Glass & Glazing was founded in 1999 with a simple belief: that every home deserves windows and doors installed with the same care the owner would give themselves. What started as a two-person operation serving South Liverpool quickly earned a reputation that spread across Merseyside — and then further.
Over the following two decades, that reputation grew. Heritage restorations in Woolton. Contemporary new builds in Heswall. Multi-unit developments across the Wirral. Each project raised the bar. Each satisfied client became an advocate. Word of mouth became our most powerful marketing tool — and it still is today.
When we discovered RK Door Systems in 2020, something shifted. Here was a manufacturer whose obsession with quality matched our own. We became their North West partner, and AGG Exclusive Doors was born — a dedicated luxury division for clients who wanted something truly extraordinary.
Today, the AGG Group brings together three specialist divisions under one roof: Allerton Glass & Glazing for architectural glazing, AGG Exclusive Doors for premium entrance systems, and AGG Developments for large-scale projects. Three companies, one standard — and it's the one we set on day one.
02
What We Stand For
Integrity
No hard sells. No hidden costs. No corners cut. We quote honestly, communicate clearly, and stand behind every project with a name we've spent 25 years building.
Partnership
We don't just install products — we represent the finest manufacturers in Europe. RK Door Systems, Reynaers, and a curated network of premium suppliers trust us to uphold their standards.
“The details are not the details. They make the design.”Charles Eames
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25 Years of Progress
1999
Founded in Liverpool
Allerton Glass & Glazing opens its doors on Allerton Road, offering quality window and door installations to homeowners across South Liverpool.
2006
FENSA Registration
Achieving FENSA certification as a registered installer, guaranteeing every installation meets Building Regulations standards.
2012
Secured by Design
Awarded Secured by Design certification by the UK Police, recognising our commitment to security-focused installations.
2020
RK Door Systems Partnership
Becoming an official RK Door Systems partner — bringing German-engineered entrance doors to the North West for the first time.
2019
AGG Exclusive Doors Launches
A dedicated luxury division is born, specialising in high-end entrance doors, steel partitions and architectural glazing for premium properties.
2023
Reynaers Alliance
Partnering with Belgian aluminium innovators Reynaers to offer Hi-Finity sliding systems, slim-profile bi-folds and precision-engineered window systems.
2025
AGG Group
Allerton Glass, AGG Exclusive Doors and AGG Developments unite under a single banner — three divisions, one uncompromising standard.
04
Our Partners
Engineered in Germany
RK Door Systems
The world's leading manufacturer of bespoke entrance doors. Every RK door is engineered to order in Germany — thermally broken aluminium, multi-point locking, and finishes that range from brushed stainless to weathered corten steel.
60mm+Panel thickness
Engineered in Belgium
Reynaers
Pioneers of slim-profile aluminium systems. Reynaers' Hi-Finity sliding doors deliver sightlines as narrow as 35mm, while their MasterLine and SlimLine window systems set the standard for thermal efficiency and minimal aesthetics.
35mmSlimmest sightline
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What Our Clients Say
“From the initial consultation to the final installation, AGG were exceptional. The RK pivot door has completely transformed the entrance to our home — it's the first thing every visitor comments on.”
James & Sarah MitchellWoolton, Liverpool
“We've used AGG across three developments now. Their attention to detail, reliability and the quality of product they specify is unmatched. They understand what the high-end market demands.”
David ThorntonThornton Developments Ltd
“The Hi-Finity sliding doors have genuinely changed how we live. The light, the views, the seamless connection to the garden — it's everything we dreamed of and more.”
Claire & Mark StevensFormby, Merseyside
“We have just recently had all our windows and doors replaced by AGG. 9 windows and 2 doors, plus we had soffit, facia, gutters and tudor boards replaced at the same time. The lads did a fabulous job and we are so happy with the end result. We opted for triple glazed units and for a small fraction of the total cost from double glazing, we have already noticed a huge difference in noise reduction and heat retention. I would highly recommend this company to anyone looking for quality windows and doors expertly fitted. I am aware this company has been operating for years and is a local mainly family run business. Which I prefer to using national companies who just want your dosh. Thanks to jess , john paul and the whole gang for an excellent job.”
Nick JonesLiverpool
“Stunning, stunning, stunning In case you think Allerton Glass only did windows they did my soffit, gutters, windows, doors and built and completed the interior decoration of my extension. The overall finish is first rate. The owner project manages the job to perfection. Only high quality materials are used. All the workmen are highly skilled and just nice blokes to have around and they take on and train apprentices. What is not to commend. Thank you Jon and the gang you have transformed my property and I love it. Sandra”
Sandra RobinsonLiverpool
“We can not recommend Allerton Glass & Glazing highly enough. Jon and his team were professional, knowledgeable and conscientious throughout the whole project. Their attention to detail was incredible and nothing was too much trouble. We couldn't be happier with our new door.”
ANDY ROBINSONLiverpool
“Highly recommended - I have to say from start to finish it was a pleasure to deal with AGG Allerton Glass & Glazing. Having had a few quotes firstly there were spot on with the price, and no pushy sales team trying to push to hard. Once we agreed the spec of the doors and price the ordering process was straight forward with great communications. The surveyor came out about a week later and he was efficient and really helpful and polite. Today the doors were fitted and the lads were amazing, shout out to Josh and Callum for being really professional, friendly and most important really good at their jobs. The doors look amazing and we are really pleased. No hesitation of recommending AGG to anyone looking for windows and doors and any of the services they do in the Merseyside and North West areas. 5 Stars 🎖️🎖️🎖️🎖️🎖️ Mr Robinson, Belvidere Road, Crosby L23”
Pete Robo.Crosby
“We are very happy with our new door, which has just been fitted today. From start to finish, dealing with AGG has been seamless. The guys who fitted the door took a lot of pride in their work and did a great job, thanks Callum & Josh. I would definitely recommend this company and use them again in the future.”
DMG ETLLiverpool
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Giving Back
Meg Hurly Foundation
Proud supporters of the Meg Hurly Foundation, working to make a difference in our local community through charitable initiatives and fundraising.
Woolton MSB Football
Sponsoring grassroots youth football at Woolton MSB, helping young players develop their skills and love of the game across South Liverpool.
Halewood Apollo Football
Supporting Halewood Apollo Football Club, investing in local youth sport and community engagement across Merseyside.
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Rooted in Liverpool.
Trusted Across the North West.
Our workshop and showroom sit in the heart of Allerton, South Liverpool — but our projects span from the shores of the Wirral to the countryside of West Lancashire and beyond.
Whether you're renovating a period townhouse in Aigburth, building new in Formby, or developing a multi-unit scheme in Cheshire — we're close enough to be hands-on and experienced enough to deliver.
LiverpoolWirralFormbyCrosbySouthportWest LancashireCheshireNorth Wales
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Let's Build Something Remarkable
Whether you have a project in mind or simply want to explore what's possible — we'd love to hear from you. Every great project starts with a conversation.
- Main dealer for RK Door Systems in the North West
- Approved Rockdoor installer
- FENSA registered
- 25-year guarantee on orangeries & conservatories
FENSA
Secured by Design
RK Door Systems
Rockdoor
Reynaers