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Room Additions

Add the space your Florida home is missing

Room additions from foundation and framing through windows, exterior tie-in, rough-ins, and finished interior space connected to the existing home.

Homeowners adding a room or expanding on a cleared lot. Based at 1788 South Dixie Hwy in Miami. Crews run jobsites across Miami-Dade and the rest of Florida.

305 Underground Construction. Miami office since 2017. We quote from a site walk - not from invented reviews.

Request a quote(321) 215-6857

Miami-Dade · Florida jobsites

See an addition from shell to finished room

The Florida addition on Our Work shows the shell and the finished family room, plus the HVAC and electrical rough-in.

Room Addition - Florida →All of Our Work →

Request a quote(321) 215-6857

Request a project quote - Room Additions

Name, phone, jobsite address, and what you need done. Or call (321) 215-6857.

Excavation and foundation, then framing, openings, and finish-out. Bring: Address and where the addition ties in; Photos of the existing house and yard; Whether land clearing or a fence line is in the same job.

Your name Phone Email Project type Choose a project typeNew Construction - ResidentialWhole-Home RemodelingKitchen RemodelingBathroom RemodelingRoom AdditionRoofingWindows & DoorsFencingLand Clearing / Site PreparationExcavation / DrainageCommercial ConstructionOther Project location Tell us about the project

By submitting this form, you are asking 305 Underground Construction to contact you about this project.

Mon - Sat · 7:00 AM - 7:00 PM · Quote from a site walk, not a catalog guess.

What we handle

• 01Excavation and foundation
• 02Framing and exterior shell
• 03Window and door openings
• 04Interior finish-out

How a job runs

• 01Confirm the footprint and how it ties into the existing house.
• 02Clear and excavate so the foundation can go in.
• 03Frame the shell, set openings, then finish the interior.
• 04Coordinate remaining site work or a fence line after the room is closed in.

Florida conditions we actually plan for

A Florida addition has to tie into the existing roof and drainage, not sit as a box on wet sand. We cut the foundation after the lot is ready, then close the shell before interior finish.

Planning resources before a room addition

A site walk helps identify access, utilities, drainage and existing conditions before the addition scope is finalized.

Common questions

Do you handle site prep for a room addition?

Yes. Excavation and lot prep happen before the foundation and framing.

Are windows and doors part of an addition?

New openings are set with the shell. Replacement units can be quoted with the addition.

Where do you build room additions?

Miami-based crew. Room addition jobsites across Miami-Dade and Florida.

Related services

Who is quoting this

305 Underground Construction. Miami office since 2017. We quote from a site walk - not from invented reviews.

• Office1788 South Dixie Hwy, Miami, FL 33157
• Phone(321) 215-6857
• HoursMon - Sat · 7:00 AM - 7:00 PM
• Since2017 · Florida jobsites

Office at 1788 South Dixie Hwy, Miami. Call (321) 215-6857. Crews run jobsites across Miami-Dade and the rest of Florida.