Garage Conversion Design Services

Existing Footprint, New Living Space. Sussex & Surrey.

Why Sussex Homeowners Trust ArchEvolve With Garage Conversions

A garage conversion is one of the most affordable ways to add habitable floor area, provided the structure, damp proofing and thermal upgrade are designed correctly. ArchEvolve is MCIAT-chartered with 15 years of experience.
House extension under construction with skip and clipboard, illustrating hidden costs of a house extension homeowners need to budget for.

Garage Conversions: Where Damp and Building Regs Get Overlooked

Converting a garage looks like the simplest project on paper, but garages are rarely built to habitable room standards. Damp proofing, floor build-up, insulation and structural openings all need proper design attention, not just a plasterboard finish.

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 garage conversion 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 checking damp levels, floor build-up and whether the garage is attached, integral or detached, since this changes the approach.
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Concept Design
We develop the garage conversion 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. Garage conversions always require Building Regulations approval, covering damp proofing, insulation, ventilation and the infilled garage door opening.
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Construction Drawings
We deliver the complete technical drawing set your contractor needs to build your garage conversion 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 Garage Conversions in Sussex and Surrey

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

Every garage conversion 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 garage conversion timeline on track.

Local Planning Knowledge

ArchEvolve has submitted garage conversion 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 garage conversion project personally. No handoffs, no junior staff taking over mid-project.

Garage Conversion Design Across Sussex and Surrey

ArchEvolve designs integral, attached and detached garage conversions for homeowners throughout the region.

Most internal garage conversions that do not change the external appearance fall under permitted development. If you are altering the garage door opening, adding windows to a side elevation, or the property is in a conservation area, full planning permission may be required. ArchEvolve confirms your specific position at the free initial consultation.

Yes, in all cases. Garages are not built to habitable room standards, so Building Regulations approval covering damp proofing, insulation, ventilation, fire safety and structural work is always required, regardless of whether planning permission is needed.

Costs depend on the condition of the existing structure, floor build-up requirements and specification. Our garage conversion cost guide sets out typical UK price ranges.

Yes, integral garages are usually the most straightforward to convert since they already share a wall with the main house, simplifying access, services and structural connections.

Damp. Garages are rarely built with the same damp proofing as habitable rooms. ArchEvolve specifies the correct damp proof course and floor build-up as standard, so this does not become a problem after the room is finished and decorated.

In some cases, a partial conversion retains a smaller storage area while converting the rest to habitable space. ArchEvolve assesses this option at the feasibility stage based on your garage dimensions and storage needs.

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 Garage Conversion Design Today

Free initial consultation for homeowners across Sussex and Surrey. Get in touch to discuss your garage.
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:

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