A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Home Addition Contractor for Pasadena Homeowners
If you’re running out of room in your Pasadena home but don’t want to move, a well-planned home addition from a Home Addition Contractor - Pasadena is the practical answer. At Benson ADU Pasadena, we handle every type of home addition from permitting through final inspection with one promise that changes the whole experience: your price is in writing before work begins. Troy Eastman has built this team around a simple rule: no surprises, no vague estimates, no disappearing acts between the handshake and the hammer. We’ve been part of the Relay Home Co. family since 2006, and every Pasadena project carries our 365-Day Done Right Promise, meaning if something isn’t right within a full year, we make it right. Call (626) 658-3527 and you’ll talk to a live person, not a voicemail loop.
Whether you need a second story from an Altadena Home Addition Contractor, a sunroom in San Marino, or extra garage space in South Pasadena, your project starts the same way: a written price, a clear plan, and real-time tracking like you’d expect from any modern service. Most contractors in this market leave you guessing. We don’t.
Sunroom Addition
A Sunroom Addition is a glass-heavy or screen-enhanced room attached to the exterior of your home, built to soak up natural light while giving you extra living space that feels connected to your yard. In Pasadena’s climate, where we get dry heat all summer and those spectacular San Gabriel Mountain sunsets, a sunroom tends to be the lowest-cost-per-square-foot addition and the fastest to build. Most sunroom additions we quote run from $65,000 to $140,000 depending on size, glazing type, and foundation work. Benson ADU Pasadena brings in James Hardie cladding or matching stucco so the exterior doesn’t look bolted on, and we put the full price in writing before any materials are ordered.
Four-season comfort and glazing options
Pasadena sunrooms built with insulated, low-E glass stay usable from Thanksgiving through Labor Day, even during the Santa Ana wind weeks when the temperature swings 30 degrees. We’ll walk you through single-pane versus double-pane versus triple-pane options, then give you a dollar figure for each so you choose with your eyes open.
Foundation and tie-in considerations
Every sunroom has to meet California seismic standards, and older Pasadena homes often reveal cracked slabs or failing footings once we open the exterior wall. We inspect the existing foundation before quoting, and our written price covers the fix if we find an issue then, not a change order later.
Second Story Addition Contractor
A Second Story Addition Contractor is the trade you call when the smartest place to grow is up, not out, usually because your Pasadena lot is already at its setback limit or you don’t want to sacrifice yard space. This is a common situation in neighborhoods like Madison Heights and Bungalow Heaven, where lots are compact and single-story homes predominate. A second story addition in Pasadena typically runs $180,000 to $350,000, and the real cost variable is whether your first-floor framing and foundation can carry the new load. Benson ADU Pasadena handles the structural engineering, the stair placement, and the day-to-day build, with every trade background-checked and uniformed on your property.
Structural load and foundation checks
Before we quote a second story, we verify what’s holding up your first floor. Many pre-1960s Pasadena homes weren’t engineered for a second level, which means we may need to add shear walls, reinforce footings, or upgrade the existing framing. We tell you all of this in the written estimate, not after we demo the roof.
Living through the build
Adding a second story means big work happening overhead while you’re often still living below. We keep the site clean, protect your first floor with floor coverings, and give you daily photo updates through our real-time tracking so you know exactly what got done each day without walking the site yourself.
Garage Addition Contractors
Garage Addition Contractors are the pros who convert, extend, or build above your garage to create rentable space, a workshop, or a guest suite, which is one of the smartest moves for Pasadena homeowners sitting on a flat-roofed garage built in the 1940s or ’50s. A garage addition or garage conversion in Pasadena runs from $85,000 for a simple conversion up to $200,000 for a substantial second-level addition. The big question is always the existing slab and framing. We inspect both. If the concrete is solid, you can save real money; if it’s not, we tell you before you sign anything. Benson ADU Pasadena builds garage additions with the same written-price rule as every other project.
Garage-to-ADU conversion path
Many Pasadena clients combine a garage addition with an ADU permit, turning the space into a legal rental unit with its own kitchenette, bath, and separate entrance. We coordinate the setback reviews, the fire separation requirements, and the utility upgrades, and explain each term in plain English as we go.
Detached versus attached considerations
An attached garage addition ties into your home’s electrical panel and often shares a wall, which keeps costs down. A detached garage addition needs its own sub-panel and more trenching for plumbing and power. We lay out the dollar difference for each option so you’re choosing with real numbers, not vibes.
Bathroom Addition Contractor
A Bathroom Addition Contractor is the specialist who designs and builds a full bath or half bath where none previously existed, which often means stealing space from a hallway, a walk-in closet, or a deep garage wall. Pasadena homeowners add bathrooms more than they realize, especially in 1920s and ’30s homes that were built with one bath for three or four people. A bathroom addition in Pasadena commonly costs $45,000 to $95,000 depending on whether it’s a powder room or a full bath with a shower, and whether we’re tying into existing drain lines or running new ones. Benson ADU Pasadena brings in licensed plumbers and electricians, and every phase is priced before we start.
Plumbing stack and venting realities
The location of your main plumbing stack determines a lot about cost. A new bath near existing wet walls is far cheaper than one at the opposite end of the house, because we don’t have to tear apart long runs of floor to reach the drain. We show you the tradeoff in writing and let you decide.
High-end fixtures without the markup mystery
You can choose the fixtures yourself or pick from our curated catalog. Either way, our written quote separates labor from materials by line item, so you see exactly what that Thermostatic valve or curbless shower pan costs before you commit. No markup surprises after the fact.
Bedroom Addition Contractor
A Bedroom Addition Contractor is the pro you hire to add one or more sleeping rooms to your home, whether at ground level, as a bump-out, or as part of a larger remodel. In Pasadena, the typical trigger is a growing family, an aging parent moving in, or a need for a dedicated home office that can double as a guest room. A bedroom addition in Pasadena generally starts around $75,000 for a modest 12×14 room and climbs to $160,000 or more when closets, larger windows, and a private entrance are part of the plan. Benson ADU Pasadena handles the drawings, the permit set, and the build, with a written price before a single stud is cut.
Permit-ready drawings and egress
Bedrooms have specific egress requirements in Pasadena, meaning the window has to be big enough and low enough for a person to climb out in an emergency. We include this in the initial quote, and if your project needs a second egress point, it’s priced from day one.
Sound insulation and California Title 24
Bedrooms are where people sleep, so wall and floor assemblies matter. We spec insulation packages that reduce noise transfer and meet or beat Title 24 energy requirements, and we’ll tell you which brand and R-value we’re installing before the drywall goes up.
Brands We Service
We work with James Hardie fiber cement siding extensively because it holds up through Pasadena’s dry summers and occasional heavy rains without warping, and it carries a 30-year non-prorated warranty. Our crews are trained on Hardie’s installation specs, from flashing to joint treatment, so the product performs the way it’s engineered to. We also build with Abodu and Cover prefab panels when speed matters, because both companies produce factory-built components that cut on-site framing time substantially.
Dvele is another option we offer for homeowners who want whole-home automation and healthy-building materials built into the wall assembly from the factory. These aren’t names we throw around; they’re inventory partners you can research on your own. Whether you choose a prefab brand like Abodu, Cover, or Dvele, a materials brand like James Hardie, or any other make, we can install it with the same written-price, background-checked-crew standard on every Pasadena project.
Signs You Need a Pro Right Now
- Your family has outgrown the bedrooms and nobody’s moving. When kids are sharing rooms past the age it works, or a parent is moving in, the real cost of waiting is daily friction and lost privacy. A bedroom addition solves it permanently, and the earlier you plan, the more options you have with the floor plan.
- You’re working from home but your “office” is the dining table. Pasadena’s housing stock is full of charming homes with zero dedicated workspace. A room addition gives you a door you can close, which, for most people, is the difference between a job and a career.
- Your garage is dead space and you’re paying for storage anyway. If you’re renting a storage unit, you’re already paying for extra square footage, just not your own. A garage addition or conversion turns that monthly cost into equity.
- Your home lost value because it has one bathroom. Real estate comps in Pasadena punish one-bath homes, especially for resale. A bath addition is one of the highest-return projects per dollar spent, and it also makes the house livable right now.
- You keep getting vague quotes that change when the crew shows up. If you’ve had contractors walk your property, give a verbal number, then revise it upward after demo, that’s the old model working against you. Our written price protects you from exactly that.
Our Process, Step by Step
- 1
Site review and written price. Call (626) 658-3527 and we schedule a walk-through at your Pasadena property. Troy Eastman or a senior project manager attends every initial site visit. You receive a written, line-item price for the entire job, not a verbal range.
- 2
Measurements, photos, and brand options. We document the existing conditions, then walk you through material options: James Hardie vs. stucco, Abodu vs. Cover vs. Dvele prefab, and budget implications for each. You pick. We price it. Done.
- 3
Permit set and engineering. We prepare the drawings and structural calculations, then file the application with the City of Pasadena’s permit office. We don’t put a shovel in the ground until the permit is issued and posted on the job site.
- 4
Build phase with daily updates. Background-checked, uniformed technicians show up on the days we say, at the time we say. You get photo updates through our real-time tracking on your phone. If anything changes, we call you before we proceed, never after.
- 5
Final inspection and 365-Day Done Right Promise. We walk the finished addition with you, close out the permit, and hand over your written 365-Day Done Right guarantee. If a covered element fails within a year, we return and make it right, on us.
How Much Does Home Addition Contractor Cost in Pasadena?
A typical home addition in Pasadena runs between $45,000 and $350,000 depending on scope, size, and structural work. A half-bath addition sits near the bottom of that range; a full second story sits at the top. Sunroom additions cluster around $65,000 to $140,000. Bedroom additions start around $75,000. Garage conversions and additions run $85,000 to $200,000. These are real numbers from projects we quote in the Pasadena, Altadena, and South Pasadena markets, not national averages from a website calculator.
What moves the needle is foundation condition, access for equipment, plumbing stack location, and whether the home is in a hillside zone that triggers additional engineering. We control cost by pricing the entire job before we start. Our written quote includes materials, labor, permits, and site cleanup, so there’s no “cost-plus” clause lurking in fine print. The free estimate you get from Benson ADU Pasadena is the same document we build from, and if anything changes during construction, we absorb communication and planning costs, not you. Call (626) 658-3527 and ask for a written quote, not a ballpark.
Our Service Area Near Pasadena
Benson ADU Pasadena serves homeowners throughout the San Gabriel Valley and surrounding neighborhoods, including Home Addition Contractor in El Monte, Home Addition Contractor in East Los Angeles, Monterey Park, San Gabriel, Duarte, Altadena, Boyle Heights, La Crescenta-Montrose, San Marino, South Monrovia Island, and South Pasadena. Our crews are dispatched from a Pasadena base, so we can reach most properties in the area without the long travel times that out-of-market contractors build into their quote.
Serving Pasadena, CA - Our Local Coverage Area
We’re based in the Pasadena area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Home Addition Contractor in Pasadena
A home addition contractor is a licensed professional who designs, permits, and builds new square footage onto an existing home, including sunrooms, second stories, garage additions, bathrooms, and bedrooms. Unlike a general handyman, a home addition contractor manages structural engineering, foundation work, utility tie-ins, and final inspections. At Benson ADU Pasadena, we handle every aspect of the addition from initial site review through final permit closeout. Call (626) 658-3527 for a written estimate.
A typical home addition in Pasadena takes 3 to 8 months from permit to final inspection, depending on scope. Sunroom additions are usually faster, around 3 to 4 months. A full second story can take 6 to 8 months. We provide a written timeline alongside your written price so you know what to expect. Call (626) 658-3527 for a project-specific schedule.
Home additions in Pasadena range from $45,000 to $350,000 depending on size, type, and structural requirements. A bathroom addition typically costs $45,000 to $95,000, a sunroom runs $65,000 to $140,000, and a second story addition runs $180,000 to $350,000. The free estimate from Benson ADU Pasadena gives you a written line-item price, not a vague range. Call (626) 658-3527 to schedule yours.
Yes, we install and build with James Hardie cladding, as well as Abodu, Cover, and Dvele prefab panel systems. Each brand has different lead times, price points, and performance characteristics, and we’ll show you all of those differences before you choose. We’re authorized to work with these brands, which means you get proper installation per manufacturer spec. Call (626) 658-3527 to discuss which brand fits your Pasadena project.
Home additions are planned construction projects, not emergency repairs, so we don’t promise same-day starts. What we do promise is that once your project date is set, our crew shows up on time and works until the job is done. For anything that becomes urgent mid-project, we answer the phone around the clock at (626) 658-3527 and can dispatch a technician if something goes wrong on site.
Every home addition we build includes a written 365-Day Done Right Promise. If anything covered by our work isn’t right within a full year, we return and make it right. We also provide a free second visit if any covered repair fails. The specific terms are in writing before work starts, not buried in a contract you sign after the fact. Call (626) 658-3527 to review our guarantee on your project.
Start by gathering any existing floor plans or site surveys you have, and make a list of what you want the new space to do, not just how big it should be. Think about where you’ll live during construction if it’s a large addition. We’ll handle permits, engineering, and site logistics, but knowing your must-haves versus nice-to-haves speeds up the quote. Once we walk the property, we give you a written price so you can plan with certainty. Call (626) 658-3527 to start.
Schedule Your Home Addition Contractor Service in Pasadena Today
Ready to see what your Pasadena property can become? Call (626) 658-3527 to schedule your free, no-obligation estimate. You’ll get a written price before any work starts, real-time tracking during the build, and a 365-Day Done Right Promise when we’re finished. If you’d prefer to start with a few questions, that works too. Troy Eastman and the Benson ADU Pasadena team pick up the phone. And if a home addition isn’t quite what you need, take a look at our home services or the full Home Addition Contractor in Pasadena guide.
Written by Troy Eastman, Owner at Benson ADU Pasadena, serving Pasadena since 2006.
