Trusted Builders for Every Space.

3JS Construction Inc is a family-owned general contractor specializing in home expansions across San Diego. We transform tight layouts with home additions, room additions, ADU construction and kitchen remodeling.

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3JS Construction Inc - Construction company in San Diego
200+
Projects Completed
5
Avg Google Rating
15+
Years Serving San Diego
Licensed
& Insured
What We Do

Full-service expansion, one tight crew.

Craftsman bungalow after rear addition with seamless roofline and new deck
Home Additions
Need a second story or ground-floor bump-out? We pour new footings, match existing stucco and integrate HVAC, electrical and plumbing so the new space feels original. Every addition is engineered and permitted before we swing a hammer.
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Master bedroom addition under construction showing ridge beam and vaulted ceiling
Room Additions
Turn cramped bedrooms into suites or add a dedicated office off the hallway. We frame with staggered studs for sound control, install Milgard windows and tie new slab to old with epoxy dowels to stop shifting.
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Modern granny flat with vertical siding and clerestory windows
ADU Construction
Build a detached 750-sqft rental unit in the backyard complete with full kitchen, stack laundry and separate meter. We handle setback surveys, utility stubs and San Diego ADU ordinance compliance from day one.
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Open-concept kitchen remodel with waterfall island and pendant lighting
Kitchen Remodeling
Rip out load-bearing walls, run new 220V for induction cooktops and install soft-close cabinetry built in our own shop. We recycle old cabinets and cover floors with Ram Board to keep the rest of the house livable.
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Close-up of stamped permit set on drafting table
Permit Handling
Our in-house expeditor submits plans to the City of San Diego the same day we finalize drawings. Track progress in real time and avoid red-tag delays. We cover correction letters until CO is issued.
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Designer reviewing 3D render with homeowners on tablet
Design Consultation
Sit down with our designer for a free 1-hour session. Bring sketches, Pinterest boards or just ideas. We measure on-site and deliver a same-day 3D model so you can walk through your future space before committing.
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How We Work

Simple process, no surprises.

01
Free Consultation
We come to you, learn your goals, and answer every question. No pressure, no sales pitch.
02
Detailed Quote
A written scope of work with line-item pricing. You know exactly what you are paying for before we start.
03
We Build It
Our own crew on site, daily updates, and a clean worksite every evening. No subcontractor surprises.
04
Final Walkthrough
We walk every room with you before calling it done. You sign off, we consider it a success.
Reviews

What San Diego homeowners say.

"3JS added 400 sqft to our Clairemont ranch and matched the 1970s roof tile perfectly. Permits cleared in four weeks and the crew was spotless."

Steven R.
Home Addition

"They converted our garage into a junior ADU with its own entrance. Rent covers most of our mortgage and the inspector praised the electrical work."

Lisa M.
ADU Conversion

"The kitchen remodel opened the wall to the dining room and added a 10-foot island. Quartz counters and shaker cabinets look straight out of a magazine."

James K.
Kitchen Remodel
Get in Touch

Ready for more space?

Call (858) 688-8247 for your free design consultation and receive a detailed quote within 24 hours.

(858) 688-8247
San Diego, CA — serving the surrounding area
Mon-Sat, 8am-6pm