Extension Builders in Johnstone

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 5 (3 reviews)

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Some of our top rated extension builders in Johnstone

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Prysm Projects Ltd
No reviews yet
Extension Builder in Johnstone
Prysm Group is a professional painting and decorating contractor based in Glasgow, delivering high-quality finishes across both residential and commercial projects. Whether it’s new-build housing, private renovations, office fit-outs, or retail spaces, we bring the same level of care, precision, and reliability to every job. We offer a full range of interior and exterior decorating services and work closely with builders, developers, property managers, and homeowners to ensure smooth delivery from start to finish. Our team is fully insured, CSCS-compliant, and experienced in managing projects of all sizes — from single units to large-scale developments. At Prysm Group, we pride ourselves on clean, well-managed sites, strong communication, and consistent quality. We understand the pressures of timelines and the importance of a great final impression — whether that’s for a homeowner moving in or a commercial handover. If you’re looking for dependable, professional decorators who are easy to work with and deliver great results, we’d love to hear from you.
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Simpson's Joinery Contracts
Rating: 5 out of 5
Extension Builder in Johnstone
I carry out all joinery works to a high standard. Internally, I carry out flooring, door hanging, kitchen fit outs and furniture making. Externally, I build sheds, decking, fencing, summerhouses and pergolas and take on any works required to make the garden/house look the way it's asked for. Always have happy customers and don't ask for payment until satisfied. No job is too big or too small. Happy to help in any way I can with quality and professionalism throughout.
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Latest review:
Extensions- 14 Oct 2023
Very happy with the overall job, Craig is very professional and kind person and the work delivered was excellent. All work was described in detail and performed as agreed. He was not the cheapest option but the quality of materials and work delivered was worth every penny. I would definitely use his service for the future and recommend him for any joinery job.
Alex
No reviews yet
Extension Builder in Johnstone
Construction management and site engineering
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DL JOINERY&PROPERTY MAINTENANCE LTD
No reviews yet
Extension Builder in Johnstone
Reliable builders delivering quality craftsmanship from start to finish. We cover all aspects of building and joinery — from structural work to fine finishing — ensuring every project is completed to the highest standard.
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Mark Odonnell joiner
No reviews yet
Extension Builder in Johnstone
With over 35 years experience I provide friendly reliable service to a high standard and have other tradesmen that I can rely upon to leave the customer happy
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Ark master builders, construction, contractors
No reviews yet
Extension Builder in Johnstone
I am a advanced level joiner and builder with 22 years of experience in the construction sector, I specialise in extinctions, loft/garage conversions, bathroom and kitchen etc I am fully insured and registered with citb... I hold relevant certificates for undertaking such projects to help clients ensure the planing, resource and compliance and completion of works in accordance to building regs and standards. We are very competitive, whilst providing a quality service. We have completed many projects in the commercial and new build market, with links to showcase our work via LinkedIn for your perusal, we are just entering the domestic side of construction and as such there will be discounted rates until we establish ourselves moving forward. We also guarantee all our work for your peace of mind, and to ensure our quality control. Thanks for your help in supporting our business. Kind regards Mark McCann Ark Construction Contracts. Building the future.
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Gage Construction
Rating: 4.4 out of 5
Extension Builder in Johnstone
Extensions are our speciality, we also do new build. Garage and loft conversions Refurbs Property development Re-roofing ie. slating tiling flat roofs Design and build Drawing and design service
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Latest review:
Extensions- 24 Jun 2024
Job was completed but not on time. Snagging list only partially finished. Despite dozens of phone calls and even driving to Hamilton no completion certificate was ever received.
B-Wize Home Improvements
No reviews yet
Extension Builder in Johnstone
Anything Home improvement wise... B-wize
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Jenga joiners ltd
New on MyBuilder
Extension Builder in Johnstone
A trusted family-run building company specializing in quality construction, renovations, and bespoke projects built on strong values and dependable workmanship.
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Manny
No reviews yet
Extension Builder in Johnstone
We specialise in commercial and property development including •Driveways •Extentions •Kitchen & bathrooms •Loft conversion •Brick work •Plastering •Decorating •Patios •Roofing •Landscaping •Ruff casting •Removals •Plumming •Gas •Windows •Door
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Takis
No reviews yet
Extension Builder in Johnstone
Carpenter. Joinery, Storekeeper. Responsible in the production sector. I am self motivated and able to work well on my own initiative or as part of a team.
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Mateusziwanicki
Rating: 5 out of 5
Extension Builder in Johnstone
👍🏻
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Latest review:
Extensions- 25 Mar 2026
Mat and Peter did a great job building an 18' shed and replacement porch. They started early and simply got stuck in. Added a patio area to finish it off.
Coltart Contracts LTD
No reviews yet
Extension Builder in Johnstone
Coltart Contracts have been trading for 40 years plus. We are a reputable local company and member with the following accreditations. Construction Line Gold Chas Elite SSIP Considerate Constructors Scheme British Association of Landscape Providers Living Wage Employer We pride ourselves on being competitive, professional and carrying out all works to a high standard
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oakspanlimited
Rating: 4.9 out of 5
Extension Builder in Johnstone
Started out as an apprentice joiner doing lots of varied joinerywork for 4 years. Since then have went on to start up my own business. Starting out with a wee van and some tools. Building the buisness up over a few years, Now with over 20 years experience And now have a highly skilled work force of Joiners , Builders and all trades contractors We Specialize in Bespoke Garden Rooms, Extensions and Structural work. Kevin Tomlinson oakspan Ltd
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Latest review:
Conversions - General- 23 Aug 2021
We converted our garage into a Garden Room and side shed and employed Oakspan for the job and are delighted with the outcome. Kevin and his team turned up promptly each day and as a result of their impressive work ethic the job was completed in a short space of time. They always left the site tidy at the end of each day and Kevin was good at providing suggestions/ideas of what we could do. I would certainly employ Oakspan again for future work and would thoroughly recommend them.
Francis Cannon
No reviews yet
Extension Builder in Johnstone
Bricklayer for over 35 years. Al works guaranteed
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ANDAL MACLOFT LTD
Rating: 5 out of 5
Extension Builder in Johnstone
Company number - SC846399 I have 20 years of experience in joinery and general building works. My specialty is: loft conversions, extensions, refurbishments, bathrooms, decorating - painting walls and wood, papering, plastering, tiling, stairs . I have 30 years of experiens in window and door instalation. I am an authorizedpartner of REHAU
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Latest review:
Windows & Doors (uPVC & Metal)- 13 Nov 2025
Helpful, punctual and did the job perfectly. Thank you.

Top rated Extension Builders

Our Extension Builders in Johnstone, are rated 5 out of 5 based on 3 reviews from customers like you.

Quality screening

Easily find verified local tradespeople. Just post your job to get quotes from tradespeople near you across the UK.

What types of services are offered by local extension builders in Johnstone?

Building an extension is a major milestone for any home. It’s not just about adding extra space, it’s a big step that can transform how you live day to day, opening up new possibilities for comfort, lifestyle, and family needs.

This is why it’s so important to find the right extension builders in Johnstone for you. They can help with a variety of tasks and projects, including:

Extending your home with an extra room
Two+ storey extensions
Adding partition walls to create more rooms
Building annexes or external structures

To find the right extension builder near you, simply post your job on MyBuilder. Explain the type of help you’re looking for, and then home extension builders in Johnstone who are available and interested can respond to your post.

Browse profiles, read customer reviews and get quotes from your chosen Johnstone extension builders, all before you decide who to hire.

What are the hourly rates of extension builders in Johnstone?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in Johnstone will charge between £16 and £42 per hour.

Single-storey rear extensions cost between £20,000 and £60,000 depending on size and finish.
The cost of double-storey extensions, which add more space and value, can range from £100,000 to over £170,000.
Larger wrap-around extensions that combine multiple extension types can range from £40,000 to over £120,000.

The cost of an extension will vary depending on your property. For instance, extending in certain areas may require structural adjustments to ensure stability, which can increase your material and labour costs.

To get an accurate price for your home extension, request detailed quotes from several Johnstone extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your Johnstone home extension project is likely to cost.

Find extension builders in Johnstone with MyBuilder

Hiring the right extension builder in Johnstone with MyBuilder couldn’t be easier. Just follow these simple steps:

Step 1: Post your extension project on MyBuilder

Whether you’re planning a single-storey extension, a loft conversion, or adding a new room, post your job on MyBuilder to find local Johnstone extension builders. Once your job is live, we’ll share it with home extension builders in Johnstone who can express their interest.

Step 2: Compare different extension builders in Johnstone

When you start receiving interest, review profiles of local Johnstone extension builders, check their previous work, and read real customer reviews. Ask about timelines, materials, and request detailed quotes.

Step 3: Hire Johnstone extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Johnstone, compare their experience, guarantees, and costs before choosing who to hire.

You’ll also have confidence knowing that every tradesperson on MyBuilder is verified through several checks, including:

ID verification: When a tradesperson joins MyBuilder, we ask for a valid ID, such as a passport, ID card, or eIDAS certificate.
Company verification: For tradespeople operating under a company, we make sure every tradesperson has a registered business.

Did you know? Our continuous monitoring and complaints process ensures that tradespeople who don’t meet our standards are promptly removed from MyBuilder’s platform.

Johnstone extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a Johnstone extension builder before hiring?

Before hiring an extension builder in Johnstone or extension building company in Johnstone, ask a few key questions to make sure you’re choosing the right professional for your home extension project.

What qualifications and experience do you have as an extension builder in Johnstone?

An extension builder in Johnstone should have a strong track record with similar projects and relevant building qualifications or trade memberships, such as the Federation of Master Builders (FMB) or TrustMark.

Will my home extension meet all building regulations and planning requirements?

Your Johnstone extension builder should ensure the project complies with Building Regulations and, where necessary, handle or assist with planning permissions. Ask how they manage building control inspections and what documentation you’ll receive once the project is complete.

What experience do you have with similar extensions in Johnstone?

Ask to see examples of their previous work, or view examples of their work on MyBuilder. Ideally projects similar to yours in scale and design. This helps you assess the Johnstone extension builder’s ability to deliver a result that meets your expectations.

How long will the extension take to complete?

Extension project timelines can vary depending on size, complexity, and weather. A typical single-storey extension might take around 8 - 12 weeks. Request a detailed schedule so you know what to expect and when key milestones will be reached.

Do you offer a guarantee for your work? Most Johnstone extension builders offer a guarantee or warranty on their work, often between 1 and 10 years depending on the project and materials used. This gives you assurance that any issues will be resolved after completion.

If you still have questions about the professional you are looking to hire, we have a full detailed guide on hiring the right builder here.

FAQ: Common questions about home extensions in Johnstone

Can an extension builder in Johnstone help with planning permission?

Yes, many extension builders in Johnstone can guide you through the planning process. They can help prepare drawings, advise on local requirements, and liaise with your local council to ensure your project meets all necessary regulations.

Can an extension builder in Johnstone handle everything from design to construction?

Many Johnstone extension builders offer full design-and-build services, managing both the architectural planning and construction stages. Ask your builder whether they can provide a complete package or if you’ll need to hire an architect or designer separately.

Will an extension builder in Johnstone help with materials and finishes?

Yes, most extension builders in Johnstone can source materials and offer advice on finishes that suit your design and budget. You can also choose to supply certain materials yourself, just make sure this is agreed upon before work starts.