DeMa Construction Ltd
Skills
- Wall Tie Replacements
- Brick / Concrete Structural Repairs
- Concreting
- General Building
- New Builds
- Fire and Flood Renovation
- Partition Walls
- Extensions / Conversions
Services
Customer Reviews
Write a review10 /10
Based on 3 reviews over the past 12 months
Quality of work
10
Reliability
10
Communication
10
Reviews (141)
10 Builder
Posted 5 days ago
Large Extension
After two years researching builders, we chose DeMa Construction based on their outstanding Checkatrade reviews. From start to finish, Marcin and his team were exceptional. Having completed many building projects over the years, I can honestly say this was the most professional experience I've had. The work was completed to a high standard, with no issues whatsoever. Trust, reliability and communication are vital when investing in a project, and Marcin excelled in all areas. He arrived as a builder and left as a friend. Highly recommended.Verified reviewerJob location: WA11RLes C10 Extensions / Conversions
Posted 17 February
Top class tradesman
Marcin’s work was of the highest standard. He was incredible detailed and thorough and the end result was brilliant. It was easy having him work in the house and he was also super tidy. Over all he was absolutely outstanding.Verified reviewerJob location: WA410 Refurbishments
Posted 23 January
Thermal Insulate Garage Ceiling
The Scope was to insulate a garage ceiling, to give the upper bedroom thermal efficiency. The preparation, agreement on materials and the completed work were very impressive. A wooden frame was installed, lined and levelled, thermal insulation and thermal plasterboard installed, and the ceiling was plaster skimmed, followed by the reinstatement of the light fittings.Job location: L2510 Refurbishments
Posted 13 June 2025
Remodelling a lounge, media wall construction & decorating
We used DeMa Construction last year for remodelling our kitchen & dining room & have just had them back to upgrade our lounge with the construction of a Media wall with the associated electric work, the whole room was also replastered & decorated. The quality of the workmanship is outstanding & Marcin is a perfectionist. He is extremely polite, knowledgeable & hard working & is probably the tidiest builder in the world !!! All in all I am extremely pleased with the whole experience & have recommended him to friends & neighbours.Verified reviewerJob location: WA5RKarl B10 General Building
Posted 20 January 2025
Building and joinery throughout the downstairs
Fabulous job done throughout the downstairs including installation of velux, new doors, flooring, brickwork plastering, pipe work etc. Fabulous job completed and would only ever use Marcin and DeMa in the future.Verified reviewerJob location: WA510 Builder
Posted 31 December 2024
Extension to rear of property with Velux windows
Marcin is a top class tradesman who works efficiently, communicates well and is very clean and tidy whilst going about his work. I have already recommended Marcin to some family and close friends.Verified reviewerJob location: Not Available
Photos
Company Info
Owner
Mr Marcin Matysiak
Ltd Company
12 years on Checkatrade
VAT Registered
Yes: 447153982
DeMa Construction is a St. Helens -based building company specialising in residential and small commercial buildings. Work type ranges from new build to building extension including loft conversion and refurbishment projects all around Merseyside . Our skills and knowledge of the unique character of buildings enables us to adhere to the high-quality, high-specification needs of modern building. We can also provide services like decoration, bathroom fit-out, kitchen installation and modernising of dated houses.
With our skilful workforce supported by our in house chartered engineer, we expertly integrate the old and the new and we know how to use space creatively – balancing the need for comfort and practicality with the sleek lines of the modern and the minimalist. We have a good portfolio of previously completed work ranging from commercial building to residential houses.
Accreditations and awards

This trade passed up to 12 Checkatrade vetting checks
Member since February 2014
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