Business Details
41 Years
experience
Expert Home Builders in North London
At Cox Format Developments, we have been delivering expert building solutions in North London for over 35 years. Our extensive experience in loft conversions, house extensions, and interior finishings ensures clients receive tailored, high-quality results. We pride ourselves on transparent pricing, fixed-scope projects, and a commitment to avoiding hidden costs. Our team handles every stage of the process, from initial planning and structural advice to final execution, ensuring compliance with local authority requirements. With a focus on using premium materials and employing skilled craftsmen, we guarantee both the durability and aesthetic appeal of our work.Our Which? Trusted Trader status and decades of positive client testimonials underscore our reputation for reliability and excellence. We prioritise clear communication, offering free no-obligation quotes and maintaining open lines of contact throughout each project. Our dedication to client satisfaction is reflected in our 35-year track record of repeat business and personal recommendations. By combining local expertise with a comprehensive service approach, we aim to make every project stress-free and transformative for homeowners in Barnet, Enfield, Hertfordshire, and beyond.
Services
Loft Conversions
House Extensions
Interior Finishings
Planning Applications
Structural Advice
Details
- Year established: 1985
Highlights and features
- 35 years of local expertise in North London building projects
- One-stop design, build, and finishing service with employed trades
- Free kitchen design service for extension clients
- Transparent pricing with no hidden extras
- Award-winning team with Which? Trusted Trader status
Associations and certifications
- Which? Trusted Trader
What people say
Reliable and trustworthy
High-quality workmanship
Completed on time
Transparent pricing
Skilled craftsmen
Services
Loft Conversions
Transform unused loft space into luxury living areas with our expert conversions. We handle all aspects from planning permission to final finishes, ensuring compliance and quality. Our 35 years of experience in North London guarantees tailored solutions that maximise space while maintaining structural integrity. Clients benefit from fixed pricing, guaranteed timelines, and a stress-free process.
House Extensions
Create more space without moving through our custom house extensions. We specialise in single and two-storey builds, combining functionality with aesthetic appeal. Our end-to-end service includes structural calculations, council approvals, and seamless integration with existing properties. With transparent costing and a focus on premium materials, we deliver durable, value-adding extensions completed on schedule.
Interior Finishings
Complete your project with our high-standard interior finishing services. From kitchen installations to full-house renovations, our team ensures cohesive, polished results. We coordinate plastering, electrics, and decorative elements to complement structural work. Attention to detail and use of superior materials guarantee long-lasting, visually striking transformations that enhance your living environment.
Planning Applications
Navigate local authority requirements with our expert planning services. We prepare detailed submissions, handle communications, and secure necessary permissions for conversions and extensions. Our deep knowledge of North London regulations ensures compliance while maximising project feasibility. Clients receive strategic advice to streamline approvals and avoid costly delays.
Structural Advice
Benefit from professional structural guidance tailored to your project needs. We assess load-bearing requirements, material specifications, and safety standards to ensure robust construction. Our in-house expertise covers complex modifications like dormer additions and party wall agreements. Clients receive clear recommendations that balance innovation with practical execution.
People
Peter Maton
CEO
With over 35 years in the building industry, Peter leads Cox Format Developments with a focus on quality and client satisfaction. He oversees strategic direction and maintains the company's Which? Trusted Trader status through rigorous standards.
Mark Rossi
Project Manager
Mark manages projects from inception to completion, ensuring adherence to timelines and budgets. His 15+ years with the company and expertise in North London planning regulations provide clients with reliable, expert oversight.
James
Site Foreman
Leading daily operations on-site, James brings 20 years of hands-on experience. Known for exceptional organisational skills, he coordinates teams to deliver high-quality work while maintaining clear client communication.
Graham
Senior Builder
Specialising in extensions and structural work, Graham has been with Cox Format for over a decade. His carpentry expertise and attention to detail ensure precise execution of complex building elements.
Melvyn
Builder
A trusted team member with 8 years' experience, Melvyn contributes to both loft conversions and extensions. Recognised for punctuality and craftsmanship, he plays key roles in achieving the company's high finish standards.
Questions
What areas do you cover for building projects?
We operate across North London, including Barnet, Enfield, and Hertfordshire, delivering loft conversions, extensions, and renovations.
How long does a typical loft conversion take?
Most projects complete within 6-12 weeks, depending on complexity. Our 35 years' experience ensures efficient timelines without compromising quality.
Do you handle planning permission and structural calculations?
Yes, we manage all council approvals, party wall agreements, and structural engineering requirements as part of our comprehensive service.
What guarantees do you offer?
All work comes with a guarantee covering both materials and workmanship, supported by our Which? Trusted Trader status and 35-year reputation.
Can you assist with financing options?
We offer flexible payment plans and can discuss financing arrangements to help manage project costs effectively.
How do you handle unexpected issues during projects?
Our team proactively addresses challenges, providing transparent cost assessments before any additional work begins, ensuring no hidden surprises.
Reviews (3)
Tony Walker
Jan 28, 2022
Report
Positive:Professionalism
Great service, job well done. Highly recommended
Service:Repair water fixtures
Great service, job well done. Highly recommended
Service:Repair water fixtures
Jamie Needcraft
Sep 29, 2020
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After several glowing recommendations from business acquaintances about work that Cox Format had undertaken for them, and finding I needed a new roof too, we booked a consultation with Peter Maton the CEO. Peter visited us with Mark Rossi who was to become our Project Manager. With both, their experience and professionalism was immediately evident and reassured us from the start. One of the things that really sets Cox Format apart is that they deal with the job from startto finish. They designed the loft along with all structural elements, and dealt with the council’s Planning and Building
Kate Pidgeon
Feb 22, 2017
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We have now used Cox Format on 3 separate occasions over many years to carry out loft conversions and kitchen extension. They have consistently worked to a very high standard. In addition to great workmanship (with zero snagging / problems) they are timely, polite and courteous, and they respond to any queries / issues very promptly. Highly recommend.
