Building A Mudroom

By Robert Robillard on Remodeling

Adding A Mudroom Addition

Building A Mudroom     

We recently decided to add a 8 x 16 mudroom onto this house.   The client went back and forth on whether to install a full basement or just a crawl space.

Benefits of a Full Basement

The benefits of a full basement can be looked at from a storage and usability point of view as well as a utility and servicing point of view.

The client was using the area in the basement where the mudroom was going to abut as a woodworking shop.   Adding a full basement meant gaining 128 square feet of additional workshop space.   Space is a commodity and  the addition of this space would allow room for two or three machines or valuable material and tool storage.

Not having a crawl space means that any service work can be accomplished easier and more efficiently.   Crawl spaces are notorious for being difficult to access and dark and musty.


Connecting The Mudroom To Main House:

The new mudroom foundation wall was a three sided structure that we connected t the main house foundation with rebar.

In order to make this mudroom accessible from the inside of the house meant that we had to cut an opening in the concrete foundation wall.  We contracted a local company that does this type of work and they came and mounted a wet saw on tracks and cut a 60 inch wide opening in the 10″ thick concrete wall.

Supporting The Foundation Opening:

We installed a 11″ triple LVL header over pressure treated 2×6 studs to support the rim joist and floor system above the opening.

Pouring the Foundation:

A 10″ concrete foundation was framed and poured  and we installed 2×10 floor joists, 16 inches on center and doubles under all interior partitions.  These joists rest on top of  the foundation and are secured to the sill plates with metal hold down connectors.  At the main house we thru bolted a ledger-board and installed the joists with joist hangers.

The floor joists were insulated with high density insulation and covered with 3/4 CDX tongue and groove sub-flooring,  glued and screwed down.

Walls and Roof:




We used 2×6 walls and high density R-21 insulation to keep this three sided, single level roofed structure from loosing heat.

The roof was framed with 2×10 rafters and also received high density R-30 insulation.  this is the perfect time to seal air leaks for the BEST heat saving efficiency.

Exterior corners as well as interior partition walls that meet exterior walls are typical spots that can be framed in such a way as to allow for less wood and more insulation.   All the extra wood in the wall increases thermal bridging while decreasing space for insulation.  READ MORE on how we frame these corners

Trimming The Exterior:


We used primed cedar clapboards, copper flashing and PVC trim to finish the exterior.


The Porch:

The porch is approximately 4-5 feet deep and has four fiberglass columns and a cool archway that carries into the mudroom hallway.

The deck is constructed out of pressure treated lumber and supported by concrete footings.  The decking is 1×4 mahogany and a faux field stone foundation was installed under the deck to hide the pressure treated frame.




Inside the Mudroom:

We installed a half bathroom and closet on one side of the mudroom and a walk in closet on the other.  The center of the mudroom is a hall that leads to the front door.  The ceiling of the mudroom as well as the porch is a barrel arch design.


Building A Mudroom

mudroom concord ma


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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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