Design & Build Extensions


Mathieu and Mitchell recommend Design & Build as the most efficient project delivery system. It means we take responsibility for all design and construction services. It gives you, the client a single point of reference for the project which helps to reduce risks, delays and misunderstandings. It is also more cost effective and faster than the usual design / bid / build method.

Design & Build projects are completed 33% faster while savings of 15% per square foot are regularly achieved.

The Design & Build method is an evolution of the Master Builder concept which is the oldest building method - in use for over 4000 years. The term architect derives from Ancient Greece where Arkhi meant 'master' and tekton meant worker/builder and their buildings too have lasted a couple of thousand years!

The Design & Build process is a rapidly growing part of our business and is the best value provider. Why? Because high quality design is usually more 'build-able' and offers a greater degree of flexibility during construction. Our experience and expertise coupled with our ongoing investment in training, education, and Health & Safety means that we can deliver well designed, good quality, practical buildings that will stand the test of time.


A design professional from Mathieu & Mitchell meets the client and discusses their objectives, requirements, planning, budget and design needs. Planning permission is applied for if required and design, specification, payment schedule and a Health & Safety Plan for the project are agreed.

Our environmental and sustainable building policies recommend that you aim for an A-rated energy efficient building which is lifetime adaptable. This means that your investment is future proofed and costly upgrades at a later date are avoided.

Prior to commencement a contract is signed laying out clearly the agreed design, specification, guarantees, warranties, completion date and importantly, the method for dealing with variations during the course of the work. Once the project is under way, frequent communication including site visits ensures that our team of master craftsmen is able to deliver the project on time and within budget.

The building may be finished to a certain level commonly known as a builder's finish (excluding painting, tiling, kitchens, wardrobes, carpets etc.), which allows the client to apply the finishing touches themselves. Alternatively a complete turnkey package is available.


Sun room extension in Oranmore
The brief was to design and build a modern, light- filled room to take advantage of afternoon and evening sunshine.
Porch / Sun Room with wheelchair access Salthill
Adapting a home for a family member with mobility issues. We have a strong track record in this area, as Lifetime Adaptable Design is a cornerstone of our business.
Flat Roof Extension in Tuam
Making a 1950's hipped-roof bungalow more energy efficient and Design & Build of a 16 square meter extension to the rear of the house.
Sun Room Extension & Patio in Killeenadeema
A well designed, affordable, energy efficient, light filled space, which maximises solar gain whilst also capturing the beautiful views of the Slieve Aughty Mountains
Loughrea Dental Design & Build
Building a new dental surgery or remodeling an existing one is a major investment in the future of the practice. It was agreed that this would be a 'turnkey' project
Sun room Extension Menlow
Unobstructed glazing which would not interfere with the views of the River Corrib was a critical part of this design to enclose a balcony.

Happy clients

  • "Mathieu & Mitchell built an extension to our period home in 2009/2010. The workmanship was excellent. We were particularly happy with the stone work which was in keeping with the character of the existing buildings. We found the builders to be conscientious and diligent, with a keen eye to detail. Overall, we were most satisfied with our finished home".
    Therese and Kieran Conlon, Ballimotte, Co. Sligo
  • “We are extremely pleased with the work carried out on the recent extension we have had added on to our home. We found that Mathieu and Mitchell’s design and build system worked very well and gave great value for money. Their attention to detail, quality craftsmanship, quality materials and encyclopedic knowledge of the building industry meant that they were a pleasure to work with. Throughout, the builders were on time, tidy and very safety conscious. They always kept us informed of what was going on. We would have no hesitation in recommending or hiring them again”
    Gary and Bernie Feeney, Killeenadeema, Loughrea, Co. Galway
  • “I gave M&M the basic layout of what I wanted and their design team did the rest. Their foreman was always willing to answer any questions or concerns we had. Although this was a small residential project their workmanship, attention to detail and safety procedures were second to none. I cannot thank Laurik, Tom and all the M&M crew enough.”
    Mary Griffith, Oranmore, Co. Galway
  • “Your company provided the best overall quote not just in terms of value for money, but in how the work would be carried out, materials to be used and possible finishing options. The quality of work undertaken was very high, done professionally and with a smile. Would I employ them again and would I recommend them to a friend? Well yes, I would on both counts”.
    Charlie Currie, Ardskeabeg, Ballyglunin, Tuam, Co. Galway
  • "After being disappointed with the modern materials and techniques we approached M&M to try and find a solution to the serious problem that we were having in our home. A solution was offered which we were happy to try and one year on we are totally happy with the result"
    Eric & Esther Mullin