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Welcome to
JSC Plastics and Construction Ltd
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JSC Plastics & Construction Ltd is a proud member of the Federation of Master Builders (FMB). All FMB members must:

1. Meet strict qualifying criteria.
2. Commit to a stringent Code of Conduct.
3. Have a minimum 12-month trading history, public liability insurance and be subject to a strict vetting process.

JSC Plastics & Construction Ltd can offer you a contract on your work and a warranty from FMB Insurance Services, assuring you of a better building experience.


01255 442 310
07947 305 564

Building Company in Frinton-on-Sea and the Surrounding Areas
Home Extensions in Every Style

Welcome to the JSC Plastics & Construction Ltd website. We are your local, family-run extension and conservatory specialist. Our building company has an unmatched reputation for enhancing homes in Essex and Suffolk through home extensions, conservatory installations and garage conversions. We also excel in the construction of garden offices and loft conversions as well as a range of building services that further improve your home. This includes the installation of uPVC windows and doors, roof lanterns and bi-fold doors

Based in Essex, our orangery specialists work across the county. Our main service areas are Colchester, Brightlingsea, Clacton-on-Sea, Frinton-on-Sea, Harwich, Holland-on-Sea, Manningtree, St Osyth, Wivenhoe and the Tendring District.

Please contact us for more about our services, and visit our portfolio to see the stunning results we achieve. We also invite prospective clients to read through testimonials from past and present clients.

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Add Space to Your Home

JSC Plastics & Construction offers a bespoke service to homeowners looking to improve their homes. Providing free quotations, design advice and a personal touch, we create the extra space you’ve been dreaming of. The limits to what we can do really are endless.

Popular options include using home extensions to create larger kitchens, utility rooms or extra bedrooms. Our building and orangery specialists can also create dining rooms, gyms, bars, annexes or any other space you require. In addition, our services include the custom design and construction of home offices, which make working from home a breeze.

Our full range of services includes:

  • House Extensions

  • Conservatory Installations

  • Orangeries

  • Garage Conversions

  • Loft Conversions

  • Garden Offices and Studios

  • Bi-Fold Doors

  • Roof Lanterns

  • Conservatory Roof Replacements

  • Window and Door Replacements

With 45 years of combined experience, our building company takes on projects of any size and complexity. Our structures are built to last and often increase your home’s value.


What Our Customers Say



JSC offers conservatory installations in all shapes and styles, giving you comfortable living space flooded with natural light.


Garage Conversions

Providing start to completion services for your conversion, our team creates any space you want to add to your home.



From bungalow extensions to double-storey home extensions, we build exactly what you want and need.


Building Services

Our range of professional building services covers everything your home needs to remain fully functional and ultimately stylish.


Garden Offices

With the help of JSC, you can create your perfect home office or studio in your garden, with all the comforts of the main house.


Areas We Cover

JSC Plastics & Construction Ltd covers a broad service area to help as many homeowners as possible achieve their property goals.

About Us

When we established JSC Plastics & Construction, we wanted to provide homeowners in Essex and Suffolk with a company unlike any other. As such, we focus on outstanding workmanship, impeccable customer care and a personal approach. This allows us to gain a true understanding of what each client is trying to achieve, so we can deliver a start-to-finish process which exceeds expectations.

To maintain our own high standards, we work closely with you and ensure regular, clear and honest communication. As client-focused builders, we listen carefully to the ideas and concepts inspiring extensions, conservatory installations, garage conversions and garden offices. We then offer product and manufacturer suggestions in line with individual budgets.

For optimal results, our building company combines traditional construction knowledge with the latest in building methods, designs and materials. Furthermore, with no showroom overheads, we can offer competitive prices, so our services are cost-effective for most budgets. This is just one reason JSC Plastics & Construction remains the trusted choice for all kinds of home extensions in Frinton-on-Sea, Colchester and the neighbouring areas – our glowing testimonials are evidence of this.

When it comes to the quality of our workmanship, you can rest assured; we hold membership with the Federation of Master Builders (FMB), have CIS cards, work with full insurance and provide a 10-year warranty. This extends to 25 years for roofing.

Call our building company on 01255 442 310 or 07947 305 564 for home extensions in Frinton-on-Sea and the surrounding areas.
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