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Home Additions in Riverside, CA

A bigger kitchen, an extra bedroom, a master suite, a second story — built so the new part of your home looks like it was always there.

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What are Home Additions?
A home addition is one of the highest-return projects you can do — but only if the finished result doesn't look bolted on. The walls have to align. The roofline has to flow. The siding, the trim, the windows, the interior trim profiles all have to match. That's the difference between an addition that increases your home's value and an addition that becomes the thing future buyers want to remove. JJ Builders has been adding to homes across Riverside for 18 years. We treat every addition as if we built the original house — and we build the new part to last as long as it.
Custom dining room renovation completed by JJ Builders
Why Riverside homeowners hire us for additions

Most additions involve three hard problems most contractors aren't great at solving:

01
Matching the existing structure

Roof pitch, foundation type, framing dimensions, electrical capacity, HVAC sizing — all have to be evaluated and respected. Wrong on any of these and you're either over-engineering (paying too much) or under-engineering (creating a future problem).

02
Permits for additions

Setbacks, lot coverage, height limits, neighbor sightlines, HOA approvals — every Riverside city has different rules. Getting this wrong adds months.

03
Living through it

Most additions happen while you're still in the home. We phase work, build temporary weather barriers, and protect your existing rooms so the disruption stays manageable.

We've solved all three across hundreds of additions. You'll get a clear plan, a permit-ready set of drawings, and a build sequence that respects your house and your family.
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What you get when you hire us
  • A drawing set that holds together. Architectural plans, structural engineering, energy compliance — all coordinated so your permit goes through clean.
  • A matched finish. Stucco texture, paint color, trim profiles, window dimensions, roof pitch — all matched to your existing home. The new addition shouldn't be findable from the curb.
  • Pricing in writing. Most additions land between $300 and $500 per square foot, scoped to complexity and finishes. We'll narrow that range for your specific project before contract.
  • Permits handled. We submit, respond to plan comments, and shepherd through inspections — including HOA approvals where applicable.
  • A schedule that names a date. Most additions take 3–6 months from groundbreak. We'll tell you the date we expect to finish, and we'll update it weekly so you're never guessing.
How We Work
01
Discovery (15 minutes, free)

What you're adding, why, and what you're working with. Free, no pressure.

02
Site Visit & Feasibility

We come look at the house and the lot. Setbacks, structural realities, utility access, roof tie-in points, HOA constraints — all evaluated before design starts.

03
Design & Permits

Architectural drawings, engineering, energy compliance. We submit to the city, manage comments, and get to permit issue. Typically 6–12 weeks depending on complexity and city.

04
Build

Foundation, framing, roof tie-in, mechanical, electrical, plumbing, finish work. Most additions take 3–6 months from groundbreak. You get weekly site walkthroughs and daily updates through Houzz Pro.

05
Walkthrough & Warranty

Final inspections, professional cleanup, written workmanship warranty (2 years standard, 5 years on luxury-tier additions), and a punch list closeout.

The Results Speak
for Themselves

Every project is designed to last, crafted with precision, managed with discipline, and finished with care. From modernized spaces to full custom homes, we deliver work that looks as good as it feels to live in.

What homeowners love about our builds:

  • Cohesive layouts and finishes that feel intentional
  • Spaces that photograph beautifully and function effortlessly
  • Clear communication and predictable progress
  • A respectful crew and a spotless jobsite, every time
  • Pricing and timelines that align from start to finish
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Most Common Questions

Frequently asked questions

We serve Riverside County and surrounding Inland Empire communities, including Riverside, Rancho Cucamonga, and nearby areas. Staying local helps us keep schedules tight and communication easy.

Yes, we design and build custom homes, accessory dwelling units (ADUs), and additions from the ground up. Expect clear pricing, detailed schedules, and craftsmanship that lasts.

Absolutely. We specialize in whole home remodels, kitchen and bath upgrades, and layout improvements that make your home feel new again, without the stress or mess.

We provide transparent estimates early, with written change orders and frequent check-ins so you always know where your project stands.

We’re a local, experienced general contractor focused on quality, cleanliness, and accountability, protecting your home, your budget, and your peace of mind from day one.

Thinking about adding to your home? Let's plan it right.
Whether you have a clear vision (extra bedroom for a new baby, master suite expansion, second-story add) or you're still figuring out what's possible on your lot, a 15-minute call is the right first step. We'll talk through your goals, your timeline, your lot constraints, and what your project realistically costs.
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