Garage Conversion Design Services

Existing Footprint, New Living Space. Sussex & Surrey.

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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.

      
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   Jonathan Gilbert 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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
  
 
      Posted on Google  
   
   Peter Proto 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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.

Our services

Garage Conversions Alongside Related Services

A garage conversion is frequently the first phase of a wider project. Many clients pair it with a full house refurbishment, or use the freed-up space as a workshop base while pursuing a self build project elsewhere on their plot. For cost context, see our garage conversion guide.

Completed rear extension at Oldfield Crescent

17 services · Sussex & Surrey

Residential

Extensions, conversions and whole-home projects for homeowners, with site visits across West Sussex, East Sussex and Surrey.

Extensions

House extensions Single storey extensions Double storey extensions Rear extensions Side return extensions Wrap around extensions Kitchen extensions Glass extensions

Conversions

Loft conversions Garage conversions Basement conversions Barn conversions

Whole home

House refurbishment Interior design Listed building design Self-build design Sustainable design

20 services · Nationwide

Developers & Commercial

Planning and technical design for developers and commercial clients across England.

Developer services

Design for developers Planning for developers Technical design for housing

Site & feasibility

Housing development feasibility Development site appraisals Residential masterplanning

Conversions

Commercial conversions Office to residential Flat conversions

Development types

New build schemes Residential developments Blocks of flats Infill housing Brownfield sites Affordable housing Mixed-use developments Care homes Student accommodation HMOs Rooftop developments

3D visualisation of a rear extension design

15 services · Homeowners and developers

Planning & Drawings

From the first feasibility check to construction drawings, in the order a project needs them.

01Feasibility & survey

Feasibility studies Measured building surveys Pre-application advice 3D visualisations

02Planning

Planning applications Planning drawings Permitted development Design and access statements Outline planning Reserved matters Discharge of conditions

03Technical & construction

Building regulations drawings Construction drawings Technical design for housing Contract administration

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

Damp proofing overlooked until problems appear after completion
Floor levels that do not match the rest of the house
Insufficient insulation leaving the room cold and unusable
Structural openings left unresolved where the garage door was
Drainage and services not accounted for in the design
Assuming no planning permission or Building Regulations are needed

How ArchEvolve solves them

Damp proof course and floor build-up specified correctly from the outset
Floor levels designed to tie in seamlessly with adjoining rooms
Insulation specification meeting current thermal standards
Structural infill of the garage door opening designed and calculated
Full Building Regulations application prepared and submitted
Full Building Regulations application prepared and submitted

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 garage conversion 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 checking damp levels, floor build-up and whether the garage is attached, integral or detached, since this changes the approach.

Concept Design

We develop the garage conversion 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. Garage conversions always require Building Regulations approval, covering damp proofing, insulation, ventilation and the infilled garage door opening.

Construction Drawings

We deliver the complete technical drawing set your contractor needs to build your garage conversion 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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Areas we cover

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

Town not listed? Ask us

West Sussex11 towns

Storrington Worthing Horsham Chichester Crawley Littlehampton Bognor Regis Burgess Hill Steyning Findon Hassocks

East Sussex2 towns

Brighton Eastbourne

Surrey1 town

Guildford

Developer or commercial project outside Sussex?

We work across England →

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.