Room Additions
Room additions in Santa Maria, San Luis Obispo and Santa Barbara: extra bedrooms, home offices and family rooms built to blend with your house.
- Family owned
- Central Coast local
- Residential + Commercial
- CA Lic. #1045554
What a room addition can include
Bedrooms, offices and family rooms
Extra bedrooms, home offices and family rooms that blend with the existing house.
Planning and layout
We work with you on how the new room connects to the rest of the house.
Foundations
Formed and poured foundations for additions. See concrete.
Matching the house
Rooflines, siding, windows and finishes chosen to blend with what’s already there.
One point of contact
Planning, scheduling and coordination of every trade, so the job runs smoothly.
Addition or ADU?
An addition makes your existing home bigger. An accessory dwelling unit (ADU) is a separate small home on the same lot, with its own kitchen and bathroom, which you can use for family or rent out. California has specific rules for ADUs; see the state ADU handbook and our ADU page.
Building up or out
Building out uses yard space and needs a new foundation; setbacks limit how close you can build to property lines. Building up keeps the yard but depends on whether the existing structure can carry a second story, which usually needs an engineer’s review.
What affects the cost
- The size of the addition.
- Foundation and structural work.
- How the new roof ties into the existing one.
- Plumbing, if the addition includes a bathroom.
- Finishes, and matching existing materials.
- Plans, engineering and permits.
After the on-site visit you get a written estimate, so you can see the scope and cost before you decide.
Why build your addition with JD Green
A good addition looks like it was always part of the house.
- With you throughout: From the first consultation to the final walkthrough.
- Licensed: California contractor’s license #1045554.
- Family-owned and local: Ninth-generation Santa Maria Valley, working across the Central Coast.
What happens after you call.
Call or text us, or send an estimate request. Tell us what you want to build, where it is, and when you’d like to start.
We meet with you to look at the site and talk through your plans, options, and budget, so the scope is clear before any work begins.
We handle the design details, permits, and scheduling, then manage the crews and keep you updated through construction.
We walk through the finished work with you and make sure everything is right before we call the job done.
Common questions
Should I build an addition or an ADU?
An addition adds space to your home; an ADU is a separate unit with its own kitchen and bathroom that can house family or be rented. The right choice depends on how you’ll use the space and your lot. See our ADU page.
Should I build up or out?
Building out needs yard space and a foundation, and setbacks limit how far you can go. Building up keeps the yard but depends on whether the existing structure can support a second story.
Do I need a permit for a room addition?
Yes. Room additions need a building permit and plans in California. Your city or county building department reviews them before work starts.
What affects the cost of an addition?
Mainly size, foundation and structural work, the roof tie-in, whether plumbing is involved, finishes, and plans and permits. You get a written estimate after the on-site visit.
Will the addition match my house?
That’s the goal: rooflines, siding, windows and finishes chosen to blend with the existing house wherever possible.
How long does a room addition take?
It depends on design, permit review time, size and weather. We can talk through timing for your addition at the site visit.
How do I check that a contractor is licensed?
Look up the license number on the Contractors State License Board website, which shows whether a license is active and what it covers. JD Green Construction’s California license number is 1045554.