LM Building Design is a leading-edge architectural design firm based in Barrie focused on custom residential design, including  new homes, renovations & additions; and interior design from time to time.

With a contemporary & modern approach, we design functional homes for those looking for something different and sophisticated. 


From minimalist to complex custom homes, we design functional  and unique homes adapted to your needs, your budget, lifestyle and its location.


Whether you need more space, change the interior layout or simply need  a face-lift of your house, our architectural design skills will give your house a new life.


Looking for that special touch? Weather is kitchen design, a bathroom, staircases, a living room, a fireplace or a bedroom design, we’ll create something unique.


  • Full architectural design
  • Conceptual house design
  • Space planning
  • Millwork shop drawings
  • Interior Design
  • Hardscape design
  • Stairs design
  • Exterior makeover
  • Additions & Renovations


We're transparent

The majority of architectural designers and architects in Barrie and area charge by the hour; by 'square footage' in some cases. Our flat rate fees based on design complexity, is simple and transparent. We don’t charge for meetings, travelling or site visits so we can seat, relax and talk. Luis will also communicate with you directly; no answering machines, long delays or miscommunication.

We're ingenious

Luis is a right & left brained, so the architectural designer is also the guy doing the maths and placing the puzzle together. Our architectural and interiors designs are unique to your project, we don’t recycle ideas. Our blueprints are made with detailed precision, easing the construction of your project with a swift permit approval. With our construction and engineering experience we can manage any challenge; no matter how complex your project is, we'll get it done.

We're geeks

Using the most advanced architectural software, you will have the opportunity to see your project and house plans in 3D from your iPad or PC. We’re  the only architectural designers in Barrie that include renderings and 3D modelling; which allows you to see your house as if it was built. You will be able to visualize our design as a whole and its different materials combinations and options.


"Luis was an absolute pleasure to deal with. Professional, attentive and meticulous, Luis provided a complete set of working drawings for our custom modern build project in Barrie in a timely fashion. We have not experienced a more seamless approval with securing a building permit as we have with L+M Building Design. Luis’ approach and vision towards modern design aligned incredibly with our vision and needs for our project. We highly recommend LM Building Design and look forward to collaborating on future projects."         -M. Carty, Level Design Build
"Working with Luis has been a great experience! He is very open to discussions with regards to design and we really felt like we worked towards exactly what we dreamed of.
He went above and beyond for us and we give him our highest recommendations!"            -A. Anava, client
"Luis has both a keen interest in & great flair for contemporary design. But just as importantly, he has a thorough understanding of how buildings are put together. A rare combination! I hope to have more opportunities to collaborate with him in the future."       -Kent Rawson - KRA Architects
Luis Mendez in Barrie, ON on Houzz
Luis Mendez in Barrie, ON on Houzz
Luis Mendez in Barrie, ON on Houzz
Luis Mendez in Barrie, ON on Houzz
Luis Mendez in Barrie, ON on Houzz

Big ideas in mind?