House Extensions
Single storey, double storey, rear, side, and wraparound extensions. Transform your home with expertly designed living space.
Extensions & Change of Use Made Simple
Award-winning architectural design services across the UK. We specialise in house extensions, loft conversions, garage conversions, and change of use applications.
- 15+ Years Combined Experience
- 500+ Projects Completed
- 98% Planning Approval Rate
- Professional Design Technologists
Contact us: 029 2115 0515 | info@hosannahs.com
Get Instant Design Quote Book Free ConsultationOur Architectural Design Services
We specialise in everything extensions and change of use. Our qualified design technologists deliver professional drawings and planning support.
Kitchen Extensions
Create your dream kitchen with a beautifully designed extension. Open-plan living, natural light, and modern design.
Loft Conversions
Dormer, hip-to-gable, mansard and velux loft conversions. Add valuable living space without extending your footprint.
Garage Conversions
Convert your garage into a home office, bedroom, gym, or living space. Cost-effective way to add space.
Single Storey Extensions
Ground floor extensions perfect for kitchens, living rooms, and home offices. Often under permitted development.
Double Storey Extensions
Maximise your space with a two-storey extension. Add bedrooms, bathrooms, and living areas simultaneously.
Rear Extensions
Extend into your garden with a rear extension. Popular choice for kitchens and open-plan living spaces.
Side Extensions
Utilise unused side space with a side return or full side extension. Perfect for terraced and semi-detached homes.
Wraparound Extensions
Combine rear and side extensions for maximum space. Create impressive open-plan living areas.
Change of Use Applications
Planning applications for change of use including commercial to residential, HMO conversions, and Airbnb lettings.
Why Choose Hosannahs Architectural Design
- 98% Planning Approval Rate - Our experienced team knows exactly what planning officers look for
- 15+ Years Experience - Combined expertise in residential architectural design
- 500+ Projects Completed - From small extensions to complete house remodels
- Professional Practice - Professional standards and industry recognition
- Fixed Price Packages - No hidden costs, transparent pricing
- Full Planning Support - From initial design to planning submission
Your Journey With Hosannahs
- Free Consultation - Discuss your project requirements with our team
- Site Visit - We visit your property to assess the site
- Design Development - Creating your bespoke architectural drawings
- Planning Submission - We handle your planning application
- Building Regulations - Technical drawings for building control approval
- Project Complete - Ready for construction to begin
What Our Clients Say
"Excellent service from start to finish. The team at Hosannahs made our extension project seamless."
- Claude Brandt
"Professional and knowledgeable. They handled our planning application perfectly."
- Shahin Malik
"Fantastic architectural drawings and great communication throughout the project."
- Keron Osbourne
"Highly recommend Hosannahs for any extension work. Very professional team."
- Sally, Yell Review
"Great experience working with Hosannahs on our loft conversion."
- Dave, Yell Review
"Excellent service and attention to detail. Our garage conversion looks amazing."
- Noah, Yell Review
Featured Projects - Change of Use
Esslemont & Macintosh, Aberdeen
Change of use application for historic building in Aberdeen city centre. Planning in progress.
Campbell Street, Glasgow
Care home to residential conversion. Successfully completed change of use project in Scotland.
Latimer House, Leicester
C3 to Airbnb conversion at 291 Thurcaston Road. Change of use completed 2025.
Port Talbot Mixed-Use Development
Commercial to 7 flats conversion. Mixed-use to residential change of use completed.
House Extension Costs 2026
Extension costs vary by type, size, and location. Use our free pricing calculator for an instant estimate.
- Single Storey Extension: £1,500 - £2,500 per sqm
- Double Storey Extension: £1,200 - £2,000 per sqm
- Kitchen Extension: £30,000 - £80,000
- Loft Conversion: £35,000 - £75,000
- Garage Conversion: £10,000 - £25,000
Costs vary by region. London and South East typically 20-30% higher than national average.
Get Your Free Cost EstimatePlanning Permission & Permitted Development
Many house extensions fall under Permitted Development rights and don't require planning permission. Our team will advise whether your project needs planning permission or qualifies for PD rights.
For projects requiring planning permission, we handle the entire application process with a 98% approval rate.
Check Your Permitted Development Rights Check Your Extension PotentialFrequently Asked Questions
What architectural services does Hosannahs provide?
Hosannahs provides comprehensive architectural design services including house extensions (single storey, double storey, rear, side, wraparound, kitchen), loft conversions, garage conversions, change of use applications, and full building remodelling. We handle planning applications and building regulations across the UK.
What is Hosannahs' planning approval success rate?
Hosannahs has a 98% planning approval rate with over 500 completed projects and 15+ years of combined experience in architectural design across the UK.
How much does a house extension cost in the UK in 2026?
House extension costs in 2026 vary by type and region. Single storey extensions typically cost £1,500-£2,500 per sqm, double storey £1,200-£2,000 per sqm. Kitchen extensions average £30,000-£80,000. Use our free pricing calculator for an instant estimate.
Does Hosannahs offer free quotes?
Yes, Hosannahs offers free instant design quotes through our online calculator and free consultations with our qualified design technologists. Call 029 2115 0515 or visit our website to get started.
Where does Hosannahs provide services?
Hosannahs provides architectural design services across the entire UK including England, Wales, and Scotland. We have completed projects in London, Cardiff, Bristol, Birmingham, Manchester, Leeds, Glasgow, Edinburgh, Leicester, Nottingham, Sheffield, Liverpool, Newcastle, Southampton, and Brighton.
Do I need planning permission for a house extension?
Many house extensions fall under Permitted Development rights and don't require planning permission. Use our free Permitted Development Checker to find out if your project qualifies. For extensions that need planning permission, Hosannahs handles the entire application process.
How long does it take to get planning permission?
Planning permission typically takes 8-12 weeks from submission. Hosannahs prepares professional architectural drawings and handles all planning submissions, with a 98% approval rate.
Architectural Design Services by Location
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View All GuidesContact Hosannahs Architectural Design
Phone: 029 2115 0515
Email: info@hosannahs.com
WhatsApp: +44 7477 495768
Office hours: Monday to Friday, 9am - 6pm
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