● Licensed & Insured · CSLB Lic. #1158371(909) 208-8655
Landeros & SonsCONSTRUCTION Call (909) 208-8655
Room Additions · CSLB Lic. #1158371

Don't move. Add on.

Bedrooms, primary suites, family rooms, second stories. We design additions that look original to your house — and cost a fraction of moving in today's market.

Free design consultation · Financing guidance · Se habla español

Free ADU Feasibility Walk-Through

Tell us where you are — we'll walk your lot and give you a straight answer, even if it's "don't build."

Prefer to talk? Call or text (909) 208-8655

30+ YearsBUILDING THE IE
LicensedCSLB #1158371 · INSURED
FamilyFATHER & SONS
FreeESTIMATES & WALK-THROUGHS
Straight numbers

What additions cost in the IE

Addition typeTypical rangeNotes
Bedroom addition (~200 sq ft)$60,000 – $110,000$300–$450 per sq ft, matched to existing home
Primary suite w/ bath (~400 sq ft)$130,000 – $200,000Biggest resale value add
Great room / family room$100,000 – $180,000Open-concept tie-in to kitchen popular
Second storyCustom quoteEngineering-heavy; we assess for free
Thinking rental income instead of space? A detached ADU is often smarter money — compare ADU costs here.

Let's look at your property together.

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