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 Woodland Hills Homeowners
A home addition in Woodland Hills adds the square footage your family needs without the cost and stress of moving, and it typically runs between $95,000 and $280,000 depending on scope, finishes, and whether you’re building out or up. Ben Ortega and the Seedling ADU Woodland Hills team have spent years working on additions across the San Fernando Valley, from sunrooms off Ventura Boulevard to second stories in Vista de Oro. We write the full price before any work starts, and every job is backed by the 365-Day Done Right Promise. If something isn’t done right, we make it right. Call (559) 249-3776 to talk through your plans.
Key Takeaways
- Written price before work starts. You’ll see the full cost on paper before a single tool is picked up.
- 365-Day Done Right Promise. Every addition Seedling builds is covered in writing for a full year.
- Cedarwell Care Promise on every job. Shoe covers, drop cloths, pet-safe products where there’s a choice, and a photo of the clean-up before our crew leaves.
- Background-checked, uniformed technicians. You’ll know exactly who is walking through your door.
- Live person answers 24/7. During an active build, you’ll never hit a voicemail tree.
Adding a room to your home is one of the biggest decisions a Woodland Hills family makes. We’ve designed our process around the thing homeowners actually worry about: what happens inside the house while the work is happening. Floors stay protected. Air stays clean. Kids keep their sleep schedules. And the crew communicates before it touches anything.
Sunroom Addition
A Sunroom Addition opens your living space to southern California light without the full foundation work of a traditional room, and in Woodland Hills it typically costs between $45,000 and $95,000 depending on glazing, insulation, and whether you need new electrical run. Our team at Home Addition Contractor - Woodland Hills handles the permitting, framing, glazing, and finishing so the new space feels like part of the house, not an afterthought. We use James Hardie siding and trim on the exterior transitions so the sunroom ties into your existing walls cleanly.
Foundation and Glazing Choices
Sunrooms on concrete slab foundations run less than rooms requiring piers or footings, and the glazing package is the single biggest price driver. Single-pane glass costs less upfront but makes the room unusable on hot August afternoons in Woodland Hills. We spec insulated, low-E glass where budget allows, because a sunroom you can’t sit in during summer is a room nobody uses.
Interior Comfort and Dust Control
The Cedarwell Care Promise applies here exactly like a full addition: drop cloths along the work path, shoe covers at the door, and a photo of the clean-up before our crew leaves each day. If your sunroom connects to a kitchen or family room, we seal the opening with plastic sheeting to keep drywall dust out of the rest of the house. Families with kids and pets notice the difference by day one.
Room Addition Contractor
A Room Addition Contractor builds a new livable room onto your existing home, and Seedling ADU Woodland Hills typically completes ground-floor additions in Woodland Hills for between $65,000 and $150,000 depending on the room’s purpose, plumbing needs, and finish level. Ground-floor additions work well for home offices, playrooms, and guest quarters. We manage architectural drawings, structural engineering, permits, and construction under one roof so you’re not coordinating four different companies.
Permitting in Woodland Hills
Woodland Hills sits within the City of Los Angeles zoning jurisdiction, which means additions must comply with LA’s building code, setbacks, and floor-area ratio limits. We pull the permits and handle the inspections, and we keep you informed about when inspectors will be on site. You’ll know what’s happening before it happens, not after.
Fixed Pricing, No Change Order Surprises
Every Seedling addition starts with a written price. If we discover something behind the wall that changes scope, we stop and explain the situation before any additional work is approved. You’ll never open a bill and find a line item you didn’t agree to. That’s the point of writing the price down before work starts.
Second Story Addition Contractor
A Second Story Addition Contractor builds upward instead of outward, and in Woodland Hills a second story addition runs between $180,000 and $320,000 depending on the roofline, staircase design, and structural reinforcement the existing walls need. This is the right move when your lot is small or the addition would eat into the yard your kids actually play in. We work with a structural engineer on every second story project to confirm the existing foundation and framing can carry the load.
Living in the House During the Build
Second story work is more invasive than a ground-floor build. We schedule the roof opening around weather so your home stays dry, and we coordinate the noisy framing days so they don’t collide with school hours or nap schedules. The Cedarwell Care Promise keeps the inside of your home protected with drop cloths and shoe covers from the first day to the last.
Staircase Placement and Flow
One of the most overlooked decisions in a second story addition is where the stairs go. A poorly placed staircase can cut into the existing floor plan and make a formerly open living room feel tight. We walk through this with you before drawings are finalized, so you understand exactly how the new circulation will feel inside the house.
Garage Addition Contractors
Garage Addition Contractors convert or expand an existing garage space into livable square footage, and in Woodland Hills a garage addition typically runs between $55,000 and $120,000 depending on whether we’re converting the existing structure, adding a bump-out, or building an attached suite above the garage. We also serve as our Home Addition Contractor in Canoga Park, which means we already know how garages in this area are framed, wired, and insulated.
Working With the Existing Structure
Many Woodland Hills garages were built decades ago with framing that doesn’t meet current code for living space. We’re honest about what needs reinforcement, what can stay, and what’s cheaper to replace than repair. You get the truth before you get the invoice. That’s the same approach our garage conversion clients get, and it works just as well when the garage becomes part of the house.
Laundry, Storage, and Tuff Shed Solutions
One thing families always ask: where does the stuff go? When a garage becomes living space, we can incorporate storage into the design, or partner with Tuff Shed for a backyard structure that keeps tools and bikes dry. The goal is a home that works in real life, not just on the drawings.
Bathroom Addition Contractor
A Bathroom Addition Contractor adds a full or half bath to your home, and in Woodland Hills a new bathroom addition costs between $35,000 and $75,000 depending on whether it ties into existing plumbing lines or needs new waste and vent runs. This is the addition that changes a household’s morning routine most directly. We use licensed plumbers for every bathroom project.
Plumbing and Waterproofing Done Right
A bathroom addition in Woodland Hills means new supply lines, new drainage, and new venting, all of which must pass Los Angeles plumbing inspections. We pull the permits, schedule the inspections, and stand behind the waterproofing with the 365-Day Done Right Promise. If a shower pan or surround leaks within the year, we fix it.
Scheduling Around Your Family’s Mornings
We plan the loudest work, like jackhammering for the drain line, for a day and time that disrupts your household least. We can’t make a bathroom addition silent, but we can make it predictable. You’ll know what’s happening tomorrow before it happens.
Bedroom Addition Contractor
A Bedroom Addition Contractor builds a new sleeping room, and in Woodland Hills a ground-floor bedroom addition typically runs between $70,000 and $140,000 depending on closet build-out, window requirements, and whether an attached bath is part of the scope. For growing families, or for homes where a parent is moving in, a new bedroom often changes the household dynamic more than any other project we do.
Egress, Light, and Air
California building code sets minimum requirements for egress windows, light, and ventilation in any new bedroom. We design around those requirements from the start so there are no surprise plan-check corrections. The room will be legal, comfortable, and ready for whatever your family needs it to be.
Quiet Tools and Considerate Hours
When we’re building near bedrooms, or near a baby’s room, we use quieter tools where there’s a choice and respect the family’s schedule. Drop cloths and shoe covers are standard. The Cedarwell Care Promise means the work area is cleaned up and photographed before our crew leaves every day.
Brands We Service
Seedling ADU Woodland Hills works with Abodu and Cover on prefab home additions and ADUs, which gives Woodland Hills families a faster path to a finished space when site access and design fit the system. Prefab panels are built off-site and assembled at your home, reducing the number of days a crew is working inside your house. We handle the site prep, foundation, utility connections, and finish work so the factory-built shell lands on a properly prepared lot.
For sunroom and exterior finishes, we use James Hardie siding and trim, which holds up to Woodland Hills’ dry summer heat without warping like lower-tier materials. Whether you have an Abodu, a Cover, or something custom, our team can help. If you’re still deciding between prefab and traditional construction, we’ll walk you through the trade-offs in plain language.
Signs You Need a Pro Right Now
- Your family has outgrown the common spaces. If your kids are doing homework at the kitchen table and your partner is on work calls from the bedroom, the square footage isn’t matching your household’s daily reality. A well-planned addition gives everyone a place to exist without tripping over each other.
- You’re working from home permanently. A permanent remote job changes what your house needs to do. A dedicated office with a closing door, proper electrical outlets, and sound separation is a room addition, not a corner of the living room.
- An aging parent is moving in. A ground-floor bedroom and bath addition can make multi-generational living workable without a move. We design for accessibility where it’s needed, and we do it without making the room feel institutional.
- You’re avoiding the yard or the garage. If you have outside space that’s not serving you, an addition or garage conversion may be the better use of the square footage. We’ll look at the lot and tell you what’s actually possible under Woodland Hills zoning before you spend money on drawings.
- You’ve been quoted prices without written breakdowns. If a contractor gave you a verbal number but won’t put it in writing, that’s a sign the price may shift once work starts. Seedling writes the full price before any work begins, and it’s a fixed price, not an estimate that drifts.
Our Process, Step by Step
- 1
Initial conversation and site visit. We walk your Woodland Hills property, talk through what you want to build, and take measurements. Within a few days you’ll have a written price for the scope as we understand it.
- 2
Design and engineering. We work with a designer and structural engineer to produce drawings that meet Los Angeles building code. We handle the permit application with the city, and you’ll get updates as plan check progresses.
- 3
Pre-construction walkthrough. Before any work starts, we walk the access path and interior areas with you. We discuss where materials will be stored, how we’ll protect floors, and what the daily schedule will look like.
- 4
Construction. Our crew shows up uniformed and background-checked, with shoe covers and drop cloths in place before tools come out. We communicate daily, photograph the clean-up each evening, and call when inspectors schedule site visits.
- 5
Final walkthrough and warranty. We walk the finished addition with you room by room. Any items that need attention are addressed under the 365-Day Done Right Promise, in writing, before we consider the job complete.
How Much Does Home Addition Contractor Cost in Woodland Hills?
A home addition in Woodland Hills typically runs between $95,000 and $280,000. A sunroom sits at the lower end around $45,000 to $95,000, while second story additions can push past $300,000 depending on structural work. Ground-floor bedrooms and bathrooms fall in the $35,000 to $140,000 range. What moves the price most: foundation and structural requirements, plumbing and electrical scope, finish level, and whether the design is custom or based on a prefab system like Abodu or Cover.
To avoid overpaying, start with a written price that includes the full scope. If a contractor won’t put the number in writing, the number isn’t real. Ask what’s included: permits, engineering, finish materials, and clean-up. Seedling’s written price includes all of it, and the 365-Day Done Right Promise is your protection after the build is finished. Call (559) 249-3776 for a free estimate, and you’ll get a line-item written price before any work starts.
Serving Woodland Hills, CA - Our Local Coverage Area
We’re based in the Woodland Hills 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 Woodland Hills
A home addition contractor is a licensed professional who manages the design, permitting, engineering, and construction of new livable square footage on your property. This includes room additions, sunrooms, second story additions, and bathroom or bedroom additions. We handle all of these services in Woodland Hills and surrounding San Fernando Valley communities, including as your Topanga Home Addition Contractor.
Most ground-floor additions take four to seven months from design to final inspection. Second story additions run longer, typically six to ten months, because of structural work and roof modifications. Your written estimate will include a schedule, and our 24/7 live phone line keeps you informed during the build.
Home additions in Woodland Hills generally range from $45,000 for a small sunroom to $320,000 for a full second story. The final number depends on square footage, structural requirements, plumbing, finish level, and whether prefab systems like Abodu or Cover fit the project. Call (559) 249-3776 for an exact quote; estimates are free.
Yes. Seedling ADU Woodland Hills serves Woodland Hills, Van Nuys, Canoga Park, Panorama City, Topanga, West Hills, Tarzana, Winnetka, Calabasas, Reseda, Encino, and Chatsworth. We know the local zoning quirks and permit processes in each of these communities.
Only if the scope changes, and only with your written approval first. Seedling writes the full price before any work begins, and we don’t add surprise line items after crews arrive. If we discover an issue behind a wall that isn’t in the original scope, we stop, explain it to you, and get your sign-off before any additional cost is incurred.
Every home addition Seedling builds in Woodland Hills is covered by the 365-Day Done Right Promise. If it’s not done right within the first year, we make it right. The warranty is in writing, not verbal.
Clear the access path to the work area, move fragile items away from adjacent walls, and let us know about any pets that need special attention during the build. We handle the protection: drop cloths, shoe covers, and daily clean-up photos. You’ll know exactly what’s expected before we start.
Schedule Your Home Addition Contractor Service in Woodland Hills Today
Call (559) 249-3776 to schedule your free home addition estimate in Woodland Hills. You’ll speak with a live person, get a written price before any work starts, and every project is backed by the 365-Day Done Right Promise. From sunrooms to second stories, Ben Ortega and the Seedling ADU Woodland Hills team are ready to help you plan the space your family needs.
Written by Ben Ortega, Owner at Seedling ADU Woodland Hills, serving Woodland Hills and the San Fernando Valley.
