17 services · Sussex & Surrey
Residential
Extensions, conversions and whole-home projects for homeowners, with site visits across West Sussex, East Sussex and Surrey.
Extensions
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.
- 15 years of experience
- 350 planning approvals secured
- 500 projects completed
- Revit 3D modelling as standard
- MCIAT-chartered accreditation
Our services
Glass Extensions Alongside Related Services
A glass extension is typically built as a rear extension and often houses a new kitchen extension layout. For further reading, see our dedicated guide to glass extensions in Sussex homes.
20 services · Nationwide
Developers & Commercial
Planning and technical design for developers and commercial clients across England.
Developer services
Site & feasibility
15 services · Homeowners and developers
Planning & Drawings
From the first feasibility check to construction drawings, in the order a project needs them.
01Feasibility & survey
02Planning
03Technical & construction
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
- Structural steels sized incorrectly, leaving visible bulky beams
- Overheating in summer from unmanaged solar gain
- Heat loss in winter from poorly specified glazing
- Condensation issues from inadequate ventilation strategy
- Roof glazing and wall glazing not designed as one system
- Planning concerns over the visual impact of large glazed areas
How ArchEvolve solves them
- Structural glazing systems specified to minimise visible steelwork
- Solar control glass and shading strategy modelled at design stage
- Glazing specification balanced for both winter heat retention and summer comfort
- Ventilation strategy designed in from the outset to prevent condensation
- Roof and wall glazing designed as a single coordinated system
- Roof and wall glazing designed as a single coordinated system
How an ArchEvolve Project Works
Every project follows a clear, stage-by-stage process aligned with the RIBA Plan of Work framework.
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.
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.
Concept Design
We develop the glass extension design in 3D and produce Enscape renders for your review before planning is prepared.
Planning Application
We prepare and submit the full application to your local planning authority and manage it through to decision.
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.
Construction Drawings
We deliver the complete technical drawing set your contractor needs to build your glass extension accurately on site.
Construction Support
We remain available during the build to respond to queries and issue drawing updates where required.
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Proudly Serving Homeowners Across Sussex and Surrey
Residential projects across West Sussex, East Sussex and Surrey, with site visits and local planning knowledge. Developer and commercial projects are delivered across England.
3Counties
14Towns
UKDevelopers
West Sussex11 towns
Developer or commercial project outside Sussex?
We work across England →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.
Does a glass extension need planning permission?
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.
How much does a glass extension cost?
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.
Will a glass extension get too hot in summer?
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.
Can a glass extension be used all 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.
Do glass extensions need special structural engineering?
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.
What is included in ArchEvolve's glass extension service?
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.
Which areas does ArchEvolve design glass extensions in?
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.
