Glass Extension Design Services

Bring the Garden Into the Room. Sussex & Surrey.

Why Sussex Homeowners Trust ArchEvolve With Glass Extensions

A glass extension lives or dies on structural detailing, thermal performance and solar control, not just the size of the glazing. ArchEvolve is MCIAT-chartered and designs every scheme in Revit with Enscape visualisation.
House extension under construction with skip and clipboard, illustrating hidden costs of a house extension homeowners need to budget for.
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Jonathan Gilbert
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I would highly recommend Alex and his company. He has amazing suggestions as well as taking into account our preferences and ideas too. He is easily accessible and has been so helpful in answering all our many questions! Looking forward to seeing our vision come to life!
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James Riley
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Alex was really helpful throughout the whole process. This was our first ever project like this and he was on hand to answer MANY questions!
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Nick Rutter
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Alex was so helpful from start to finish, great communication throughout. Would strongly recommend and will definitely use their services again in the future!
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arron tully
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Alex at Arch Evolve assisted with obtaining planning permission for a couple of extensions that we were intending on doing. Very professional and offered allot of very helpful advice. Very Happy Thank you.
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Marcus Eaton
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I have worked with Alex on many projects over the years and he has always been brilliant! Looking forward to working together again soon. Very professional and smooth process throughout the whole process.
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Charlotte Morley
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Archevolve has completed a number of plans for us due to changing my mind regularly. They have been consistently patient & listened to my requirements at all time. Alex has then been on hand for our builders if required. Fantastic company & highly recommended
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Peter Proto
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Used Alex for our large project, loft conversion, side garage and rear extension. Unbelievable service from start to finish. We are over the moon with the finish. Thank you so much!!
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Tony Maio
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Great service, they had an excellent understanding of my requirements. They applied great attention to detail, with a fast and very efficient service together very reasonable costs. I highly recommend this firm.

Glass Extensions: Where Structure Meets Solar Performance

A glass extension asks more of the structural design than almost any other extension type, since large spans of glazing need to be supported without bulky steelwork ruining the effect. Thermal and solar performance also need resolving properly, or the room becomes unusable for half the year.

Common challenges

How ArchEvolve solves them

How an ArchEvolve Project Works

Every project follows a clear, stage-by-stage process aligned with the RIBA Plan of Work framework.
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Initial Consultation
We discuss your brief, site and budget for your glass extension project, along with any planning constraints specific to your council. Free, no obligation.
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Feasibility Assessment
We assess planning viability and site constraints before any design fees are committed. This includes early input on structural glazing options and how much steel support the design will realistically need.
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Concept Design
We develop the glass extension design in 3D and produce Enscape renders for your review before planning is prepared.
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Planning Application
We prepare and submit the full application to your local planning authority and manage it through to decision.
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Building Regulations
We produce the full Building Regulations package covering structure, thermal performance, drainage and fire safety. Glass extensions require detailed structural calculations for glazing support, which we coordinate directly with a structural engineer.
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Construction Drawings
We deliver the complete technical drawing set your contractor needs to build your glass extension accurately on site.
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Construction Support
We remain available during the build to respond to queries and issue drawing updates where required.
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A Different Standard of Design for Glass Extensions in Sussex and Surrey

Most practices in the region still work in 2D CAD. ArchEvolve designs glass extension projects in Revit and renders in Enscape, so you see the finished space before planning is submitted.
3D Visualisations Included

Every glass extension project is modelled in Revit and rendered in Enscape. You see accurate light, materials and spatial quality before a planning application goes in.

Faster Planning Submissions

Drawings produced in a coordinated 3D environment are more complete and less prone to officer queries, which keeps your glass extension timeline on track.

Local Planning Knowledge

ArchEvolve has submitted glass extension applications across West Sussex, East Sussex and Surrey planning authorities. Your submission is prepared for the specific council from day one.

End-to-End Service

From feasibility through to construction drawings, Alex Page manages every stage of your glass extension project personally. No handoffs, no junior staff taking over mid-project.

Glass Extension Design Across Sussex and Surrey

ArchEvolve designs structural glass extensions for homeowners throughout West Sussex, East Sussex and Surrey.

This depends on size and position rather than the amount of glazing itself, so many glass extensions follow the same permitted development rules as a standard rear extension. ArchEvolve confirms your specific position at the free initial consultation.

Glass extensions typically cost more than a standard extension of the same size due to the glazing specification and structural requirements. See our house extension cost guide for general extension cost context.

Only if the glazing specification and shading strategy are not properly designed. ArchEvolve models solar gain at concept stage and specifies solar control glass and shading where needed to keep the room comfortable year-round.

Yes, provided the glazing specification addresses both winter heat loss and summer solar gain. This is a core part of the design brief for every glass extension ArchEvolve delivers.

Yes. Large spans of glazing need to be supported by carefully sized structural elements, ideally minimised so they do not interrupt the glazed effect. ArchEvolve coordinates this directly with a structural engineer during design.

The service covers feasibility assessment, structural glazing coordination, 3D concept design with Enscape visualisation, planning application, full Building Regulations drawings, and construction drawings for your builder.

ArchEvolve covers West Sussex, East Sussex and Surrey, including Worthing, Horsham, Chichester, Crawley, Guildford and Brighton, with a free initial consultation offered throughout the region.

Frequently Asked Questions

Start Your Glass Extension Design Today

Free initial consultation for homeowners across Sussex and Surrey. Get in touch to discuss your glazed extension.
Architect and homeowners reviewing plans outside a completed UK brick house extension with glazed roof and bifold doors, illustrating 2026 house extension costs and design options.

Our Latest Publications:

Single Storey vs Double Storey Extension: Pros & Cons
Wrap Around Extension Ideas and Costs: UK Guide
What Does an Architectural Designer Do? A Complete Guide to the Role, Skills and When to Hire One
What to Expect: First Architectural Designer Meeting
Does a House Extension Add Value to Your Property? A Practical UK Guide
Does a Loft Conversion Add Value to Your House? A UK Homeowner’s Complete ROI Guide
Hidden Costs of a House Extension in the UK: What Homeowners Need to Budget For
How Much Does a New Build House Cost to Design in the UK? A Complete 2026 Cost Guide 

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