House & Kitchen Extension Builder Islington
At KT5 Construction, we specialise in house extensions in Islington that blend functionality with style.We focus on creating spaces tailored to your needs while respecting the architectural heritage of Islington’s Victorian and Georgian homes
Communication is key to what we do.
What We Do

Building Construction
New Builds, Extensions, Conversions, Renovations

General Building
Property Maintenance, Handyman Service, Decorating

Design
Planning, Design, Project Management, Quality Checking
Custom House Extensions in Islington by KT5 Construction
Why Choose KT5 Construction for Your Islington House Extension?
Expertise in Period Properties
We have extensive experience working with Islington’s unique architecture. Our team seamlessly integrates modern designs into period properties, ensuring the character of your home is preserved.
Full-Service Design and Build
From initial consultation to final handover, we provide a complete solution:
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- Planning Permission: Guidance and applications tailored to local regulations.
- Design Excellence: Customised plans to suit your style and needs.
- Expert Construction: Skilled builders delivering high-quality results.
Sustainable and Energy-Efficient Solutions
We incorporate eco-friendly materials and energy-saving technologies, such as underfloor heating and triple-glazed windows, into your extension.



Types of House Extensions We Offer in Islington
Single-Storey Extensions
Enhance your ground floor with a single-storey extension, perfect for open-plan kitchens, dining areas, or additional living space.
Rear Extensions
Connect your home to your garden with a rear extension, featuring bi-fold doors, skylights, and seamless indoor-outdoor transitions.
Side Return Extensions
Maximise narrow spaces with side return extensions, ideal for expanding kitchens and dining rooms.
Wrap-Around Extensions
Combine rear and side extensions to create expansive, open-plan areas tailored to modern living.
Double-Storey Extensions
Add extra bedrooms, home offices, or bathrooms with a double-storey extension, ideal for growing families.
The Benefits of a House Extension in Islington
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- Increase Property Value: Extensions can boost your home’s market appeal and resale value.
- Modernise Your Space: Upgrade your home with contemporary designs and smart technology.
- Tailored to Your Lifestyle: Create functional spaces that meet your family’s specific needs.
- Save Time and Money: Extend your existing home rather than relocating.
Our House Extension Process
Step 1: Initial Consultation
We meet to discuss your goals, budget, and vision for the project.
Step 2: Planning and Design
Our experts handle the design process and planning permission applications to ensure a hassle-free experience.
Step 3: Construction
Our skilled builders execute the project efficiently, maintaining the highest standards of craftsmanship.
Step 4: Final Inspection and Handover
We complete your extension with a thorough quality check and provide all necessary certifications.
Client Testimonials
“You made it so simple” – Just wanted to say thank you for making what I thought would be a difficult process much easier than I had imagined.
Thank you for my brand new house! The refurbishment and attention to detail makes it feel like a brand new house, but without the expensive cost of moving.
Just wanted to thank you for the work carried out to my new bathroom, I will definitely be in touch shortly to talk about my proposed kitchen extension.
Frequently Asked Questions About House Extensions in Islington
Q: Do I need planning permission for a house extension in Islington?
Most extensions require planning permission. Our team manages the application process to ensure compliance with local regulations.
Q: How long does it take to complete a house extension?
Project timelines vary, but a typical extension takes between 8–16 weeks, depending on complexity.
Q: How much does a house extension cost?
Costs depend on the size, design, and materials used. Contact us for a personalised quote.
Contact KT5 Construction for Your House Extension in Islington
Ready to transform your home? Trust KT5 Construction to deliver exceptional house extension services in Islington. From planning and design to construction and handover, we are with you every step of the way. Contact us today for a free consultation.
Positive Approach
Be flexible and react quickly to changing demands in order to understand and deliver over and above the clients expectations.
Communication
Management input on a day to day basis and regular client contact ensures problem free contract delivery which is built around the client’s needs and expectations.
Attention To Detail
We take time with our clients during the tender and procurement stage to make sure the small details are thought of and dealt with, making the build process easier.
Delivery
Throughout the project we will update our customers on when their project will be finished, our company ethos is “On Time & On Budget”
Why KT5 Construction?
We Work With You
KT5 works with you on your project, large or small, making sure that we deliver your new project to the high standard you can expect to receive.
25 years’ Experience
You can relax knowing that your project is being managed by a knowledgeable, experienced team.
Quality Focused
Quality and design with our customers in mind. We pride ourselves on using the most modern building techniques and the skilled people.
YEARS OF EXPERIENCE
Completed Projects
Contact Us
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