A modern two-story house with a gray exterior, black windows, a wooden fence, and a landscaped front yard with plants and trees under a partly cloudy sky.

Room Addition

EXPAND YOUR HOME. AMPLIFY YOUR LIFE.

More space. More value. Less time than you think.

ADDITION TYPES WE DELIVER

Your family has grown. Your lifestyle has evolved. But moving in the Bay Area means competing in one of the most expensive real estate markets in the world. A thoughtfully designed home addition by EDR Design Build gives you the space you need — without the disruption, cost, or compromise of relocating.

Second-story additions — add bedrooms, a primary suite, or a home office above your existing footprint

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Rear and side additions — expand your kitchen, dining, or living areas into underused yard space

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Garage conversions — transform attached or detached garages into livable square footage

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In-law suites and multigenerational additions — private, connected living for family members

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Pool houses and studio additions — creative flex space that extends your home's function and value

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THE EDR ADDITION PROCESS

We handle every phase — from feasibility and design to permits, construction, and final finish. Our integrated design-build approach means no finger-pointing between architect and contractor. One team owns the outcome. And because we design and build simultaneously, your addition is completed faster and at lower total cost than the traditional fragmented model.

Bright bedroom with large window, bed with purple bedding, cozy chair nearby, fireplace with glowing fire, decorative artwork above fireplace, potted plant, and neutral decor.

WHY HOMEOWNERS TRUST EDR FOR ADDITIONS

• 100+ completed projects across the Bay Area — additions, remodels, and new builds

• In-house architecture and engineering — design starts immediately, not months from now

• Proven track record with Palo Alto, Sunnyvale, and San Mateo permitting departments

• Daily on-site supervision — your project never goes unsupervised

• Transparent pricing — no inflated allowances, no surprise change orders

A modern kitchen with a white marble island, beige chairs, white cabinetry, a black stove, and decorative plants and flowers.
A cozy corner in a home office with a wooden desk, a patterned office chair, a tall white bookshelf decorated with books and small decor items, and a vase of white flowers. A wooden door with glass panels leads to another room.
Cozy bedroom with a bed, armchair, fireplace, and large window with white curtains overlooking a landscape.
Modern bathroom with wooden vanity, large mirror, flowers, glass shower enclosure, freestanding bathtub, window with view, pendant light, and rustic stool.
Backyard patio with wooden deck, two lounge chairs, a hot tub, a seating area with cushioned wicker furniture, plants, and a house with gray siding and white trim, under clear blue sky.
Backyard patio with wooden deck, two lounge chairs, a hot tub, a seating area with cushioned wicker furniture, plants, and a house with gray siding and white trim, under clear blue sky.
Bright bedroom with white walls and ceiling, wooden beams, chandelier, large glass sliding doors opening to a patio with greenery, white bed with blankets, cozy chair with faux fur throw, fireplace, plants, and decorative items.
Open-concept kitchen and living room with large windows, modern lighting fixtures, a ceiling fan, and various seating including chairs and armchairs, with a view of trees outside.
Open-concept kitchen and living room with large windows, modern lighting fixtures, a ceiling fan, and various seating including chairs and armchairs, with a view of trees outside.
Open-concept kitchen with a large island, dark blue cabinets, white countertops, stainless steel refrigerator, and a row of windows with a backyard view. Dining table with black chairs is visible in the foreground.
Open-concept kitchen with a large island, dark blue cabinets, white countertops, stainless steel refrigerator, and a row of windows with a backyard view. Dining table with black chairs is visible in the foreground.

Frequently Asked Questions

  • EDR Design Build handles room additions, second-story additions, primary suite additions, living space expansions, kitchen expansions, and other major home expansion projects.

  • Yes. EDR Design Build is a design-build firm, which means we manage the process from concept and design through permitting, engineering coordination, construction, and final completion.

  • Yes. Our team designs additions to feel connected to the original home, including exterior materials, rooflines, layout flow, finishes, and overall architectural style.

  • The timeline depends on the size, complexity, permitting, engineering, and material selections. Most home additions require time for design, city approval, construction, inspections, and finish work.

  • Yes. Most home additions require permits, plans, engineering, and city inspections. EDR Design Build helps coordinate this process.

  • In many cases, homeowners can remain in the home during construction, depending on the scope of work, utility impacts, and safety considerations.

Let’s work together –
call us, or fill in our online form.

Call (650)888-2107