420 sq ft guest cottage, granny flat, or rental unit — factory-built, off-grid capable.
As Seen On
You want more space.
You don't want a construction nightmare.
Fixed price from day one
Factory-built quality + predictable timeline
Start with a free Space Check (no commitment)
Most backyard additions take 12–18 months, involve multiple contractors, and end up over budget. Mesocore is different — factory-built off-site, delivered ready to install, with a fixed price from day one.
420 sq ft of Premium, Purpose-Built Living
A complete guest cottage, granny flat, or rental unit — with everything included.
1 Bedroom with built-in storage
Hurricane-rated windows and exterior doors
1 Full bathroom
High-performance insulation + wall system
Full kitchen + built-in cabinetry (standard appliances)
Welded steel chassis (engineered to exceed code)
HVAC system + integrated ventilation
Energy-efficient LED lighting throughout
Plumbing + electrical systems integrated and tested in factory
All-in-one washer/dryer included
From your backyard to move-in —
here's how it works
Mesocore projects follow a clear, simple path:
Takes ~2 minutes / No obligation / See if your lot qualifies
Built for today.
Ready to grow tomorrow.
Most modular units are fixed forever.
Mesocore is engineered differently — start with what you need now, expand later without re-engineering anything.
Pre-Designed Expansion Layouts
Planned from day one
No redesign required
Aligned with the original core design
Pre-Engineered Connections
Structural load paths defined
Utility connection points planned
No re-engineering required
Builder-Ready Documentation
Clear construction documents
Compatible with traditional builders
Predictable execution
The benefits of building this way
The practical benefits of planning for growth from day one.
Good questions.
Here are straight answers.
The most common questions we hear — answered directly.
"Can I customize the layout?"
The floor plan is fixed by design — and that's intentional. A standardized layout means faster permitting, consistent quality, and a price we can guarantee. You use the space however works for you.
"Can it be larger than 420 sq ft?"
The Model E is engineered to 420 sq ft. If you need more space over time, the Expandable Core is designed exactly for that — future expansion without starting from scratch.
"I've seen similar structures for $30–65k online."
Most low-cost kit structures aren't built to U.S. residential codes and can't be legally permitted as living spaces in most jurisdictions. The Model E meets IRC and FBC standards — designed to be fully permitted, not just assembled.
Not all backyard structures are built equal.
Many low-cost options look similar online.
The difference is in what's behind the walls — and whether it can legally be your home.
4.5 ★★★★½ on Google
Real feedback from people who've connected with the Mesocore team.
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Modular Solar Homes · West Palm Beach, FL