Your Trusted Builders in North London
Commercial & Residential Construction Services – Quality Craftsmanship, Guaranteed.
Our Range of Expert Building Solutions
We deliver precision and care in every project, from loft conversions to full renovations.
Loft conversion
Home Improvements in North London
We specialise in making every loft conversion as simple and stress free as possible. If you are contemplating a Loft conversion to your property, it can add as much as 25% in value. This means you’re likely to make money from your loft conversion in the long run. Add 25% value to your home with our stress-free, profit-driven conversions.
Home extension
Home Improvements in North London
Seamless expansions tailored to your lifestyle and budget.
Renovations
Home Improvements in North London
A house renovation can be the perfect way to buy a house within your price range and refurbish it into your ideal home to suit your tastes and requirements or as a wise investment. Transform tired spaces into your dream home or a lucrative investment.
Kitchen installations
Home Improvements in North London
The place in the house where stylish flair can really come into its own is the Kitchen. If you are looking for a team of talented tradesmen to bring your visions to life, get in touch with us today.
Bathroom installations
Home Improvements in North London
Fully insured, end-to-end bathroom installations with luxury finishes.
Roofing
Home Improvements in North London
We specialise in different types of roofing. Always working with the latest innovations materials, providing the best option for the client with high quality standard finished works. Durable, innovative roofing solutions for all property types.
Building Trust Since 2013
Cosy Build rebrands a decade of excellence in Hertfordshire and North London. Fully insured, guaranteed, and recommended by families across the region.
Local, Reliable & Fast
Affordable Rates, No Surprises
Let's work together!
Contact Us
Monday to Friday from 9:00 AM to 5:00 PM
Saturday from 9:00 AM to 3:00 PM
Sunday - Closed
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
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.