Our Story
Cosy Build is a new chapter in our journey, rebranding after over 10 years of trusted building and construction expertise across Harpenden, Radlett, Hertfordshire, North London, and surrounding areas.
Cosy Build dedicated team takes care of everything
Based in Hertfordshire, our professional, reliable tradesmen serve St Albans, Harpenden, Radlett, North London, and nearby regions, delivering high-quality building services with a commitment to excellence. Formerly known as Luan Ajazi Home Improvements.
10+
Years in the construction industry
500+
Projects completed across Hertfordshire & North London
98%
Clients satisfaction rate
Who We Are
Cosy Build is a family-run, customer-focused building company with deep roots in the Hertfordshire and North London construction industry.
Our team consist of:
Highly skilled craftsmen with decades of combined experience.
Fully insured and certified professionals for your peace of mind.
Local experts who understand the architectural styles and regulations of the area.
What We Do & What We Care About
Cosy Build is a family-run, customer-focused building company with deep roots in the Hertfordshire and North London construction industry.
We specialise in:
Loft conversions – Maximising your home's space and value. Loft conversions – Maximising your home's space and value.
Home extensions – Seamlessly blending new spaces with your existing property.
Renovations – Modernising or restoring homes to their full potential.
Kitchen & bathroom installations – Stylish, functional upgrades.
Garden renovations, roofing, flooring, carpentry & more – Complete home transformations.
Our Values:
Quality craftsmanship – No shortcuts, just durable, beautiful work.
Transparent pricing – No hidden costs, just honest quotes.
Reliability – We stick to deadlines and communicate clearly.
Customer satisfaction – Your vision is our priority.
What sets Cosy Build apart?
Decades of local expertise
We know Hertfordshire & North London's building standards inside out. We know Hertfordshire & North London's building standards inside out.
End-to-end service
From planning to completion, we handle everything.
Guaranteed workmanship
Our builds come with warranties for long-term assurance.
Personalised approach
We treat every project as if it were our own home.
Happy Clients, Lasting Relationships
EPDM Flat Roof
"Luan did my flat roof with the new material EPDM. Luan did a clean, neat job and approx two years later the roof looks just as good and no leaks even after some heavy stormy weather. Luan will respond to any questions in a short frame of time and has a pleasant manner. However he does like plenty of English tea."
Property Owner AL4 0SX | 2024
Chimney Breast Removal
"Luan and his team were excellent - they arrived early and set to work immediately, keeping everything tidy as they went. Communication has been prompt leading up to the work. Would highly recommend!"
Property Owner HA5 5HR | 2023
Garage Roof Replacement
"Luan has done a great job with replacing our garage roof. Good communication, neat and tidy and great work. I can thoroughly recommend using Luan for local building work. Thanks Luan, top work."
Property Owner AL2 1LX | 2023
Bathroom and Bedroom Plastering and Painting
"Luan and his team were always reliable, punctual, worked professionally and we were very happy with the quality of all work done. He is also very approachable, always answers texts or questions quickly and is a very nice person."
Property Owner N2 8NL | 2022
Gate Fitting and Erected Fencing
"Excellent service, great job, reliable and polite person."
Property Owner AL2 1ET | 2022
Painting and Decorating
"Leo and his team are excellent workers. Very thorough, neat and efficient. Leo has painted lots of parts of my house, fitted a new bathroom and also carried out many different maintenance jobs - roofing, plastering, guttering, etc. He is happy to help and I thoroughly recommend him and his team!"
Property Owner SW16 1JG | 2022
Painting and Decorating
"Punctual and polite. Very neat work and kept the place tidy. Really pleased with the end result -would definitely recommend."
Property Owner AL10 9GL | 2021
Bathroom Renovation, Painting and Decorating
"I initially employed Luan to paint a couple of rooms after my pipes burst. Impressed with his work ethic and his prices,and then employed him to rip out a damaged bathroom and fully replace it. I fully recommend him to anyone looking at employing him - He is easy and fun to work with. Kept my close throughout the project informing me of issues and giving me enough information to make decisions when needed. He was tidy, polite, always on time, went out of his way to go to shops and find the right parts- very committed to the end result. I will be using Luan in my next project(s)!"
Property Owner N3 2NS | 2021
Frequently Asked Questions
Where does Cosy Build operate?
Are you insured and certified?
How much does a loft conversion cost?
Do you handle planning permissions?
What's your typical project timeline?
Can you work within my budget?
Do you provide warranties?
How do I get started?
Get a Free Quote Today for Your Home Project!
Transform your living space with confidence. Our expert team will visit your home, understand your vision, and provide a detailed, no-obligation quote. Trusted by homeowners across Harpenden, Radlett, Hertfordshire, North London, and beyond, we deliver quality craftsmanship and exceptional results.