# Room Additions in San Dimas, CA | Dollhouse Construction - Business: Dollhouse Construction Inc (CSLB #1045801) - Phone: (626) 991-8219 - Page: https://dollhouseconstruction.com/room-additions/ - Last updated: 2026-10-09 (generated from the live site copy at build time) > Primary suites, bump-outs and second stories in San Dimas and nearby. Designed, permitted and built by one crew. Written price. CSLB #1045801. Room additions · San Dimas and nearby # Room additions that look original. Bump-outs, primary suites, second stories. Designed, permitted and built by one crew. Will it fit? Walk my house [Call Dallas: (626) 991-8219](tel:+16269918219) - 4.6 · 19 Google reviews - Written, fixed-price quote 25 years in the trades In-house design and our own crew CSLB #1045801 Licensed in California 4.6 · 19 reviews on Google What kind ## Four ways to add space. We tell you which one is yours. ### Bump-out A few feet onto a kitchen, family room or bedroom. Smallest scope, no new roofline in many cases. ### Primary suite A new bedroom and bath on the ground floor or back of the house. ### Second story Add a floor to a one-story house. The existing foundation and walls get checked first. ### Family room or office A new space joined to the house for how you live now. Will it fit? Walk my house Compare: addition or ADU? Want a separate unit with its own kitchen? [See ADUs](https://dollhouseconstruction.com/adu-construction/). Before After (design render) Concept images, not photos of our work. Drag to compare. The details ## Old and new, no seam. The hard part isn’t the new room. It’s the join. We plan the seam before we frame it. - Matching the roof pitch and material - Matching stucco or siding texture - Aligning floors so there’s no step - Windows that fit the house’s style - Paint and trim that blend Will it match? Walk my house [Call (626) 991-8219](tel:+16269918219) Before we draw ## Six things decide what fits. We promise nothing before we’ve seen your house. 1. Setbacks and lot coverage How much of the lot you can build on is set by your city’s zoning. We check yours. 2. The existing structure Foundation, walls and roof get checked before we add weight or openings. 3. Soil San Dimas lists a soils report for new homes and substantial additions. 4. Utilities Where sewer, water, gas and electrical run, and whether the panel can carry more. 5. Structural plans For structural work, plans and calculations must be signed and stamped by a California-licensed architect or engineer. 6. Energy report When new floor area is added, an energy efficiency report is also required. This is the San Dimas list (City of San Dimas, Homeowner’s Guide to the Building Permit Process). Other cities differ. Walk my house with Dallas [Call (626) 991-8219](tel:+16269918219) Out or up ## Going out, or going up. Each one changes the structure in a different way. Bump-out Grows out. New footing, same roofline in many cases. Second story Grows up. The existing foundation and walls get checked first. How it works ## Five steps, one person to call. ### 1. Walk Dallas walks your house and yard, listens, and sketches options. ### 2. Design In-house design: plans, elevations, a budget range. ### 3. Permit We submit and manage plan check. San Dimas lists these approximate first-check times: room additions under 500 sq ft, 10 to 15 working days; larger additions, second floors and small houses, 15 to 20 working days. Corrections add time. ### 4. Build Foundation or framing, roof, systems, finish. Inspections before anything gets covered. ### 5. Walkthrough Final inspection, punch list, keys back to you. Dallas walks you through the whole project before it starts. You always know which step you’re in and what comes next. Start with a house walk [Call (626) 991-8219](tel:+16269918219) Day to day ## You live here. We build around that. What the house looks like ### Work hours Work hours in San Dimas are Monday to Friday 7 am to dusk and Saturday 8 am to dusk. No work on Sundays and holidays. (City of San Dimas) What we do about it ### We plan around your family Tell Dallas about kids, pets, work-from-home days and anything you need to keep running. He builds the schedule around it. [Ask Dallas how it works day to day](tel:+16269918219) Walk my house Compare ## More room for you, or a second home? Addition ADU What it is New space joined to your house. A separate small home on your lot, with a kitchen and bath. Best for A bigger family or a home office. A relative, a renter, or an income unit. Rules Your city’s zoning and building code. State law limits what cities can require (4-ft side and rear setbacks, no minimum lot size). HCD, Apr 2026 Dallas can tell you which one fits your lot in one walk. Walk my lot [ADU details](https://dollhouseconstruction.com/adu-construction/) Your money ## A written price, and payments that follow the work. ### Written price One fixed-price quote before work starts. No surprise add-on fees. ### Payments follow progress California generally limits a down payment on a home improvement contract to $1,000 or 10% of the contract amount, whichever is less (Business and Professions Code section 7159.5). Then you pay as stages finish. ### Changes in writing Change orders are written, priced before work and approved by you. [Get my written estimate](https://dollhouseconstruction.com/free-estimate/) [Read how we work](https://dollhouseconstruction.com/how-we-work/) Addition questions ## Straight answers Can you go up a floor on my one-story? Sometimes. We check the foundation, walls and roof first, and an engineer reviews it. It’s yes or no only after that check. Do I need a soils report? San Dimas lists one for substantial additions. It comes from a California-licensed geotechnical engineer. How long does the city take? San Dimas lists first-check times of 10 to 15 working days for additions under 500 sq ft, and 15 to 20 working days for larger additions and second floors. Corrections add time. Will my property taxes go up? We can’t advise on that. Ask the LA County Assessor or your tax adviser. What if you find a problem when you open the wall? We stop, show you, price the options, and you decide in writing before we go on. [More questions](https://dollhouseconstruction.com/faq/) [Call (626) 991-8219](tel:+16269918219) Sources (retrieved 2026-10-06): [City of San Dimas, Homeowner’s Guide to the Building Permit Process](https://files.sandimasca.gov/Documents/Departments/Community%20Development/Building%20and%20Safety/Forms%20and%20Handouts/Homeowners-guideto-the-building-permit-process.pdf); [HCD Housing Law Fact Sheet: ADU, April 2026](https://www.hcd.ca.gov/sites/default/files/docs/planning-and-community/housing-law-fact-sheets.pdf); California Business and Professions Code §7159.5. House walk ## Will it fit? Let’s walk it. Dallas looks at your house, your yard and your list, then talks through what fits and what it would involve. No pressure. You talk to Dallas. (626) 991-8219 Talk to the owner Link: tel:+16269918219 ## Next step - Free estimate: https://dollhouseconstruction.com/free-estimate/ - Call (626) 991-8219 (Dallas, the owner) - All files for AI assistants: https://dollhouseconstruction.com/llms.txt