Loft Conversion Design Services

An Extra Floor Without Extending the Footprint. Sussex & Surrey.

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Why Sussex Homeowners Trust ArchEvolve With Loft Conversions

A loft conversion is one of the most cost-effective ways to add space, but only when headroom, stair access and structural loading are resolved correctly. ArchEvolve is MCIAT-chartered with 500 projects completed.

      
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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.
  
 
      Posted on Google  
   
   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.
  
 
      Posted on Google  
   
   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!!
  
 
      Posted on Google  
   
   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

Loft Conversions Alongside Related Services

A loft conversion is often the first step in a wider transformation. Many clients combine it with a full house refurbishment or new interior design scheme so the new floor feels integrated with the rest of the home. For step-by-step guidance, read our definitive guide to attic transformations.

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

Loft Conversions: Where Headroom and Planning Collide

Loft conversions look simple on paper, but headroom requirements, staircase positioning and roof alterations catch out designs that are not planned properly from the start. Getting this wrong means a converted loft that cannot legally be used as a habitable room.

Common challenges

Insufficient headroom once floor build-up is accounted for
Staircases that eat into valuable first floor space
Dormer designs that look disproportionate to the roof
Roof structure loading missed until Building Regulations stage
Confusion over permitted development limits for dormers
Fire escape and means of access requirements overlooked

How ArchEvolve solves them

Headroom calculated accurately from the structural survey stage
Staircase positions tested in 3D before committing to a layout
Dormer proportions designed to suit the existing roofline
Structural loading assessed with an engineer at concept stage
Fire safety and escape routes designed in from the outset
Fire safety and escape routes designed in from the outset

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 loft 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 measuring available headroom and assessing which conversion type, such as dormer, hip-to-gable or rooflight, suits your roof.

Concept Design

We develop the loft 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. Loft conversions require careful attention to fire safety, means of escape and floor loading, which we build into the drawing package.

Construction Drawings

We deliver the complete technical drawing set your contractor needs to build your loft 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 Loft Conversions in Sussex and Surrey

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

3D Visualisations Included

Every loft 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 loft conversion timeline on track.

Local Planning Knowledge

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

Loft Conversion Design Across Sussex and Surrey

ArchEvolve designs dormer, hip-to-gable and rooflight loft conversions for period and modern properties throughout the region.

Many loft conversions fall under permitted development, subject to volume limits and restrictions on dormer positioning. Hip-to-gable conversions and those on designated land usually need full planning permission. Our planning permission guide for loft conversions explains the current thresholds.

Costs vary significantly by conversion type, from rooflight conversions to full dormer or hip-to-gable schemes. Our loft conversion cost breakdown sets out typical ranges for each type.

In most cases, yes, particularly when it adds a genuine extra bedroom with an en suite. Our article on whether a loft conversion adds value covers what makes the difference.

Building Regulations require a minimum head height over the staircase and a workable ceiling height in the main room, which varies with roof pitch and existing joist depth. ArchEvolve confirms whether your roof has sufficient headroom during the feasibility stage, before any design fees are committed.

ArchEvolve designs rooflight conversions, dormer conversions, hip-to-gable conversions and mansard conversions, matching the type to your roof structure, budget and planning constraints.

Staircase positioning is one of the most important early decisions, since it affects the layout of the floor below as well as the new loft space. ArchEvolve tests staircase options in 3D at concept design stage so you can see the impact before committing.

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 Loft Conversion Design Today

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