Endorsed by Which?

C.M. Williams Joinery & Building Contractor

4.9

3 Reviews

Opening Hours
Today - 07:00–18:00
  • Monday 07:00–18:00
  • Tuesday 07:00–18:00
  • Wednesday 07:00–18:00
  • Thursday 07:00–18:00
  • Friday 07:00–18:00
  • Saturday - Closed
  • Sunday - Closed

Why you can trust this trader

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About

Welcome to the homepage of C.M.WILLIAMS JOINERY & BUILDING CONTRACTOR we have been trading since 2016 where Carwyn started as a one man band with a single vehicle...which has grown in 2026 to 5 vehicles/plant along with a team of 8 tradesmen

Here at C.M.WILLIAMS we pride ourselves on carrying out all our work to the highest of standards while working closely with the client bringing their vision and dreams to reality

We have various projects ongoing around the anglesey...gwynedd and conwy area regularly where we always deliver on time to work with the clients schedule but most importantly on budget

From initial drawings to completion we can help every step of the way...we thrive on accepting the biggest challenges to make sure we stand out as a competent and organised reputable company

Whether it's a small project or a new build to the highest specification...give us a call or send an email/whatsapp

We look forward to working with you

Carwyn

What we do

  • Carpenters

    • Joinery and carpentry
    • Custom Woodwork and Installation
    • Doors
    • Joinery
    • Kitchens
    • Log cabins, log homes and summer houses
    • Stairs
    • Wardrobes and Cabinets
  • Builders

    • Extensions
    • Loft conversions
    • Garage conversions
    • Porches
    • Building services
    • Conservatories
    • Guttering repair services
    • Log cabins and homes
    • Plastering
  • Building construction contractors

    • Basement conversion
    • Basement Waterproofing
    • Building construction management
    • Porches
    • Canopy
  • Architects

    • New Builds
    • Attic Conversion
    • Building permit services
    • Extension design
    • House design
    • Interior Design
    • House project management services
    • Roof Conversion
    • Planning permission
    • New Houses
  • Roofers

    • Rubber roofing (EPDM)
    • Guttering, fascias and soffits
    • Chimneys
    • Cladding
    • Emergency roofing service
    • Lead work
    • Roof and skylights
    • Roof Light
    • Flat roofing
  • Glaziers

    • UPVC Windows
    • Aluminium Windows
    • Double glazed units
    • Double glazing installation
    • Glass boarding up and replacement
    • Replacement window services and repairs
    • Sash windows
    • Stained glass
    • Timber windows
    • Triple Glazing
    • Velux windows
    • Window consultants
  • Doors

    • UPVC doors
    • ​Aluminium doors
    • French doors
    • Front door
    • Bi-fold doors
    • Composite doors
    • Door repairs
    • Fire doors
    • Orangeries
    • Patio doors
  • Landscape contractors

    • Hard landscaping
    • Artificial lawns
    • Decking
    • Drystone walling
    • Garden structures
    • Irrigation systems
    • Sheds and shed bases
    • Turfing
  • Exterior Decorating

    • Exterior house painting
    • Pebbledash
    • Wall Rendering
  • Plastering

    • Rendering
    • Plastering
    • Coving
    • Flat ceilings
    • Lime plastering
    • Pebble dashing
    • Plaster mouldings
    • Screeding and dry lining
    • Skimming
    • Venetian marble plastering
  • Fencing

  • Kitchen fitters

    • Granite Worktops
    • Kitchen design
    • Kitchen installation
    • Kitchen refurbishment
    • Kitchen tiling
    • Kitchen worktops
  • More Services

    • structural building work
    • roof repairs

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.9
3 reviews
Customer Service
5.0
Quality
5.0
Value
4.7
Sort by
Built 3 extensions. Extremely happy.
Customer Service
Quality
Value
Carwyn built a front porch, a bedroom with ensuite and utility room and a dining room. Also composite decking and a garden store. Very happy with the quality of the work and budget control. No post build problems whatsoever. Would definitely use again.
Customer in Isle of Anglesey Posted on 14/05/2026 , work completed 30/06/2025
Absolutely fantastic
Customer Service
Quality
Value
I had 4 companies to quote for an extension and Carwyn stood out by far. His quote was not the cheapest but not the most expensive. He took time to listen to what we wanted to achieve and carefully considered all the options. A quote was provided and the budget was kept to apart from extras which we required. The workmanship was fabulous and the team great to work with. The guys were punctual, worked hard and always cleared up at the end of the day. The results were fantastic and we ended up with a large utility room, downstairs toilet and opened up our kitchen. It was a challenging job because of various issues but Carwyn dealt with everything in his calm and lovely manner. Materials were always on site ready for the next step and he had the job proceed in a military fashion so there were no delays. We were thrilled with the end result, building control signed off the work with no issues and I would recommend Carwyn and his team 1000% for any works you need undertaking
Customer in Conwy Principal Area Posted on 14/05/2026 , work completed 10/09/2024
Quality outfit and great team
Customer Service
Quality
Value
Carwyn and team completed a large extension and new outbuilding for us plus other subsequent work. The quality of work was to a high standard and his new team are a pleasure to have on site. The quality of the build was important to us and he has delivered that. Anything not quite right was fixed without issue and any changes were easily accommodated. Communications were also very good as was the billing process which whilst not cheap was fair and reasonable without any surprises. I have and will continue to use Carwyn and team again in the future.
Customer in Posted on 14/05/2026 , work completed 06/04/2026