Expert House Extensions in London | Leading Design & Build Company
A well-designed house extension is one of the smartest ways to add space, light and value to a London home without the cost and upheaval of moving. At IONESI Development, we deliver professional house extensions in London, providing a complete design and build service tailored to your home, lifestyle, and budget. Whether you’re planning a rear extension, a side return layout upgrade, or a modern open-plan kitchen extension, our team manages everything with precision, from concept to completion.
Expert Home Additions & Extensions Across London
As trusted home extension specialists, we help homeowners expand their living space with beautifully designed and expertly built extensions.
Our work combines architectural planning, structural expertise, and high-quality construction to create extensions that feel like a natural part of your home, not an afterthought.
If you’re looking for a bespoke design and build company in London, IONESI Development is here to guide you through a smooth, stress-free extension journey.
Types Of House Extensions We Offer
Every home is different, and so is every extension. We offer a range of extension options designed to increase space, improve functionality, and bring in more natural light.
Rear Extension
A rear extension is one of the most popular ways to expand your home and open up your living area towards the garden. It’s ideal for creating larger kitchens, dining spaces, or bright open-plan layouts while adding valuable extra room on the ground floor.
Side Return Extension
Side return extensions are perfect for making better use of narrow side spaces, especially in terraced homes. This type of extension helps widen the ground floor, bringing in more light and creating a more practical and modern interior layout.
Single-Storey Extension
A single-storey extension is a great option for homeowners who want to increase space on the ground level without changing the upper floors. It offers a cost-effective way to enhance everyday living, whether you need a larger family room, kitchen upgrade, or home office area.
Double-Storey Extension
For larger projects, a double-storey extension provides additional space across both the ground and upper floor. This is an excellent solution for growing families or detached house extension plans, allowing you to add multiple rooms while significantly improving your home’s layout and long-term value.
Design & Planning Services for London Extensions
A successful home extension begins with the right design and careful preparation. At IONESI Development, we provide complete design and build services to ensure your project is planned properly from the very start.
Our team focuses on meticulous planning and execution, helping you make the most of your space while ensuring the extension blends seamlessly with your existing home. As trusted extension builders, we guide you through every stage, from initial design ideas to the final construction plan.
We also support homeowners with key requirements such as planning permission, working closely with local authorities where needed to ensure your extension meets all guidelines. Every project includes detailed drawings, compliance checks, and structural design approval to guarantee safety, durability, and long-term performance.
Why London Homeowners Choose IONESI Development Over Other Builders
Choosing the right team for your home extensions is one of the most important decisions you’ll make. At IONESI Development, we are trusted by homeowners for delivering high-quality extensions with expert support, careful management, and results that enhance everyday living. Whether you’re planning a full home upgrade or a wider property renovation project, we provide the experience and reliability you need.
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From Consultation to Completion
We offer a complete service that covers everything from the first consultation through to the final finishing touches. Our team ensures your extension journey is smooth, well-organised, and professionally managed, with clear guidance at every stage. -
Skilled London Extension Specialists
Our experienced extension team works alongside residential architects and technical experts to deliver extensions that suit homes perfectly. We understand the demands of period properties, modern layouts, and complex renovation requirements. -
High-Quality Finishes & Client Satisfaction
We take pride in delivering exceptional workmanship on every project. From structural work to interior detailing, our focus is always on quality, long-lasting results, and client satisfaction, especially for larger house renovation and refurbishment projects. -
Transparent, Reliable Service
Homeowners choose us for our honest approach and strong project organisation. We provide accurate project planning, realistic timescales, and clear communication throughout the build. Our goal is to deliver an affordable home extension solution without compromising on standards. From a full extension to a simpler garage conversion, we plan every project around your budget and timescale.
Our Design & Build Process for House Extensions in London
From your first consultation to the final handover, our experienced team manages every stage of your project, keeping the process straightforward, transparent and well organised.
- Free consultation and site visit – We assess your property, discuss your goals, and provide practical advice based on your space and budget.
- Design and architectural drawings – We work with experienced architects and designers to create plans tailored to your requirements.
- Planning and building regulations – We manage planning permission (where required), permitted development assessments, and building regulations approval.
- Construction and project management – Our skilled team delivers your extension to a high standard while keeping the project on schedule.
- Final finishes and handover – We complete the finishing touches, carry out quality inspections, and hand over your new space ready to enjoy.
Contact Us to Start Your London House Extension Today
If you’re ready to create more space, improve your home’s layout, and bring your extension ideas to life, IONESI Development is here to help.
We provide expert extension services for houses across London, offering full support from design and planning through to construction and final finishes. If you are also looking to renovate your property, our team can guide you through the wider project with clear advice and professional management. Whether you’re considering a rear extension, side return extension, or a larger double-storey build, our team will guide you with clear advice and professional project management.
Get in touch today to discuss your requirements, request a consultation, and take the first step toward a beautiful home extension built around your lifestyle. View our recent projects.
Frequently Asked Questions
When Is the Right Time to Consider a House Extension?
It is a great option when you need more space but don’t want the stress and cost of moving. It’s ideal for growing families, home office needs, or improving your kitchen and living areas.
Are House Extensions in London a Cost-Effective Home Improvement?
Yes, a well-planned extension can be a cost-effective way to gain additional living space and increase your property’s long-term value, especially compared to buying a larger home.
What Does a Planning Permission Application Involve?
A planning permission application is the process of getting approval from your local council before starting certain types of extension work. It ensures the design meets local guidelines, neighbour considerations, and development rules.
Do You Support Homeowners with Extension Design and Planning?
Yes, we provide full support with extension design, planning guidance, and building regulation compliance to ensure your project runs smoothly from start to finish.
How Long Does a House Extension Take?
Timescales vary with size and complexity, but a typical single-storey extension often takes a few months from the start of construction. We agree on realistic timescales with you before work begins.
Will I Need to Move Out During the Build?
For most single-storey and side return projects you can usually stay in your home, and we plan the works to keep disruption to a minimum. We will advise you honestly at the design stage.
