YDS Architects

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YDS Architects Architecture Design Firm. We design and permit Accessory Dwelling Unit (ADU), TOC Condos, and SB9. Contact us today for a free consultation.

YDS Architects is a leading architecture firm in Monrovia, California, specializing in ADU & multifamily residential architecture design. We guide clients through the entire process, from architectural design and building plans to obtaining building permits in Southern California. Whether you're looking for ADU, apartment building, and residential home design in Southern California our team of locally experienced architects led by architect Yifu Pan, can help. We serve clients throughout San Gabriel valley area to Greater Los Angeles and Southern California offering architectural design services and expertise in permit expiditing for both residential and commercial architecture. Our services include:

- Architectural design from Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California
- Apartment building design and permitting Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California
- Building plans Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California
- Design and permits Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California
- Home design Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California
- ADU design and permitting Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California
- Architectural drafting Monrovia, San Gabriel valley area, Greater Los Angeles to Southern California

Have questions about modern home design in Monrovia or need an architect for restaurant design in Monrovia? We're here to answer your questions:

How much does an architect cost in SoCal? What permits do I need to remodel in Socal? YDS Architects, Your trusted local partner for architectural design and building permits in Monrovia and SoCal.

Dolores Drive, Altadena — drag to look around. Nine 360° views rendered straight from our Revit model and set into the r...
10/07/2026

Dolores Drive, Altadena — drag to look around. Nine 360° views rendered straight from our Revit model and set into the real street: the front yard, living room, kitchen, primary suite and balcony, the motor court, the garden path and the old coast live oak at the back of the lot.

09/29/2026
Our new site is live, come check it out at ydsarch.com 😍
09/24/2026

Our new site is live, come check it out at ydsarch.com 😍

Project Feature • Altadena RebuildThree oaks split this Altadena lot into three parcels before we touched the plan, so t...
09/22/2026

Project Feature • Altadena Rebuild

Three oaks split this Altadena lot into three parcels before we touched the plan, so the design works around their canopies, not through them. Two residences and an ADU, parking tucked between root zones, rooflines cut sharp against terra-cotta and stucco. Slower than a clean lot would’ve been. Worth it.

YDS Architects

Residence M — Altadena RebuildClear volumes, California landscape, and a material palette that feels distinctly YDS: tea...
08/27/2026

Residence M — Altadena Rebuild

Clear volumes, California landscape, and a material palette that feels distinctly YDS: teal Hardie panel, warm terra-cotta stucco, and charcoal accents.

A new page for our Altadena rebuild work. Too bad we didn’t get the chance to feature this one in the rebuild competition.

We’re honored to be nominated by Volume Zero Architecture Competitions for the  . Thank you for the recognition.This pro...
08/25/2026

We’re honored to be nominated by Volume Zero Architecture Competitions for the . Thank you for the recognition.

This project explores a leap toward autonomous architecture for extreme environments—combining modular design with aerial robotics to address the “sunlight and access” paradox of canyon-floor living.

Rather than forcing architecture onto a difficult site, the concept asks how architecture itself can become adaptive, deployable, and responsive to its environment.

We’ll be sharing more of the design process, diagrams, and ideas behind the project in the coming weeks.

By separating the building into layers, it shows how the massing, floor layout, circulation, and roof work together befo...
08/09/2026

By separating the building into layers, it shows how the massing, floor layout, circulation, and roof work together before the project is built. It offers a closer look at the planning behind the final design.

More to come at YDSArch.com.

Material selection plays an important role in defining the character of a project. Vertical wood siding, white and grey ...
08/07/2026

Material selection plays an important role in defining the character of a project. Vertical wood siding, white and grey stucco, perforated brick, and a restrained natural color palette work together to create a cohesive exterior while reinforcing the building's massing and proportions.

A palette developed to support the architecture, not compete with it.

For this project, the challenge was to maximize the buildable footprint within SB 684 and Culver City guidelines while m...
08/04/2026

For this project, the challenge was to maximize the buildable footprint within SB 684 and Culver City guidelines while maintaining efficient access across the site.

The design uses a combination of building forms, massing, and material transitions to shape the development while responding to the site's constraints. This approach accommodates four residential units, each with its own ADU and private garage, maximizing both housing capacity and the property's development potential.

More to come at ydsarch.com.

This proposal increases the property's development potential by transforming one residential unit into four residences, ...
08/02/2026

This proposal increases the property's development potential by transforming one residential unit into four residences, with each home paired with its own ADU and private garage.

Through a careful combination of materials, complex forms, and strategic planning, the design maximizes the site's potential while creating a cohesive residential development.

Swipe through to discover the ideas behind the design.

Address

177 N Primrose Avenue
Monrovia, CA
91016

Opening Hours

Monday 8am - 6pm
Tuesday 8am - 6pm
Wednesday 8am - 6pm
Thursday 8am - 6pm
Friday 8am - 6pm
Saturday 8am - 6pm

Telephone

+16266600206

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