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Top-Rated Architects in Ontario - Updated Nov 2026

Avatar for Drafting Design Services
Drafting Design Services
4.8(
18
)
Draftsperson/CADD

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Credit card accepted

Offers commercial services

"If you?re here looking for an architect, look no further. Francisco is the man for the job. He helped us with a garage to ADU conversion. Francisco kept us informed and communicated with us throughout the entire project. He was very professional, helpful and patient. We had tons of questions and he had the answers. He is very efficient and great at his job. We would hire him again with no hesitation. Thank you Francisco for making for making this process a breeze!"
Response time2 days
3 neighbors recently requested a quote
Recommended by70%of homeowners
Avatar for XPL Landscape
XPL Landscape
5.0(
20
)
Architect - LandscapeArchitect - Landscape - For Business

Serving Ontario, CA and surrounding areas

Approved

In business since 2001

Free estimates

Credit card accepted

"George and his guys were very professional and did a great job. They delivered a great finished product and I will definitely hire them again for future landscaping needs."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+5

Response time1 day
99 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Pac Sands Corp
Pac Sands Corp
5.0(
7
)
ArchitectDraftsperson/CADDDesigner - Building

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Free estimates

Credit card accepted

"We did a full remodel of our place, full new kitchen, and expanded our place into the backyard for a new master suite. Pac Sands did a really great job with our designs. Great tools that made the communication easy with the plans and changes we needed. And they handled the engineering and permitting too, which was great. Highly recommend."
6-Plex Aerial view
6-Plex Render
Carlsbad 6-Plex Axo
Response time2 days
178 neighbors recently requested a quote
Avatar for Viveros landscaping
Viveros landscaping
4.5(
33
)
Architect - LandscapeArchitect - Landscape - For Business

Serving Ontario, CA and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"I hired Adrian to complete my front yard. He was friendly, had references and his price was very fair. He did a beautiful job and I am beyond happy with the results. He’s also organized and explained things clearly."
Landscaping Project
Landscaping Project
Landscaping Project
Landscaping Project
Beforw

+131

Response time1 day
42 neighbors recently requested a quote
Recommended by53%of homeowners
Avatar for CODAspaces
CODAspaces
5.0(
6
)
Architect - For BusinessDraftsperson/CADD

Serving Ontario, CA and surrounding areas

Approved

In business since 2007

Free estimates

Small jobs welcome

"Jeromes extensive experience with business TI projects made him the perfect choice for our needs. Hiring him was one of the best decisions we could have made. His exceptional skill, combined with his genuine kindness and honesty, truly set him apart. Culver City presents its fair share of challenges, particularly with the citys responsiveness, but Jerome and his team went above and beyond. They consistently communicated with the city on our behalf, advocating tirelessly to expedite the permit process and relieve so much of the stress on our end. Jerome dedication and professionalism are unmatched, and his commitment to his clients is evident in every step of the process. If you are looking for an architect with top-tier expertise who truly cares about his clients success, look no further. Jerome is simply the best!"
Response time1 day
15 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Michael Lancy Architect, Inc.
Michael Lancy Architect, Inc.
5.0(
4
)
Draftsperson/CADDArchitectArchitect - For Business

Serving Ontario, CA and surrounding areas

Approved

In business since 1999

Small jobs welcome

Offers commercial services

"Mike was very professional, all options were fully explained to me. He delivered as promised and continues to make himself available if issues should arise. I would highly recommend his firm."
San Dimas ADU
San Dimas ADU
San Dimas ADU
San Dimas ADU
San Dimas ADU

+12

Response time2 days
Response rate100%
3 neighbors recently requested a quote
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.7(
42
)
Designer - Building

Serving Ontario, CA and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: True professional

"Our kitchen remodel exceeded our expectations, providing us with a beautiful and highly efficient space for cooking and gathering. We're thrilled with the results, as the new design seamlessly integrates style and functionality."
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+1

Response time6 hrs
Recommended by17%of homeowners
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Architects FAQs, answered by experts

In most cases, you should hire a draftsperson for simpler projects like minor home renovations, and you should hire an architect for new construction, structural changes to your home, and large home add-ons. If you’re working on a larger project that demands an architect or structural engineer, your professional will often have a draftsperson on staff and include their services in your estimate.

Your state’s architect licensing registry is an excellent place to begin when finding an architect. The state must license architects after completing the required education and with a minimum amount of experience. You can also ask other homeowners with similar projects who they used and their experience.

When conducting space planning, building codes and regulations need to be considered. As long as you are taking them into account and discussing them with the architect, you should be able to do your space planning appropriately.

An architect is usually involved in the process of determining the layout and structural features and requirements of the home itself, taking into account the local codes, climate, and materials needed to make the home structurally sound. Architects may communicate more with contractors and subcontractors throughout the building process. In comparison to architects, interior designers typically focus on the aesthetics of a home interior and possibly exterior, helping the homeowner decide on color schemes, textures, and materials to incorporate into the design. 

Typically, architects do not build homes in a hands-on sense of doing the actual framing, roofing, or other building. Architects usually do not have the training and experience to build the homes they design. An architect would need to know how to do the specific trades required to build a house, which is possible but not a common practice. A general contractor or homebuilder typically oversees the actual details of building the house that the architect designs.

The Ontario, CA homeowners’ guide to architectural services

From average costs to expert advice, get all the answers you need to get your job done.