--- title: "a423 architecture & design, Inc. — Architects & Building Designers | Houzz" canonical_html_url: https://www.houzz.com/professionals/architects-and-building-designers/a423-architecture-and-design-inc-pfvwus-pf~436606274 markdown_url: https://www.houzz.com/md/professionals/pf~436606274.md entity_type: LocalBusiness business_name: "a423 architecture & design, Inc." category: ["Architects"] image: https://st.hzcdn.com/fimgs/62f37a6403b47880_2977-w400-h400-b0-p0--.jpg address: "33 Penn St, Hellertown, Pennsylvania 18055, United States" latitude: 40.5817 longitude: -75.3255 phone: "(610) 838-5100" website: http://www.a423design.com rating: 5 review_count: 4 best_of_houzz_awards: 6 followers: 55 last_updated: 2026-11-07 --- # a423 architecture & design, Inc. Original Houzz profile: [a423 architecture & design, Inc.](https://www.houzz.com/professionals/architects-and-building-designers/a423-architecture-and-design-inc-pfvwus-pf~436606274) ## Professional summary - **Primary category:** Architects - **Location:** Hellertown, PA - **Serves:** Lehigh Valley, Allentown, Bethlehem, Whitehall, Easton, Whitehall Township, Fullerton, Emmaus, Hanover Township, Quakertown, Wilson, Catasauqua, Hellertown, Fountain Hill, Palmer Heights, Coplay, Hokendauqua, North Catasauqua, Freemansburg, Bath, Coopersburg, Spinnerstown, Old Orchard, Raubsville, Cementon, West Easton, Richlandtown, Stiles, Riegelsville, Glendon, Northampton, Middletown, Ackermanville, Alpha, Center Valley, Finesville, Flicksville, Kintnersville, Old Zionsville, Ottsville, Phillipsburg - **Houzz rating:** 5.0 out of 5 (4 reviews) - **Best of Houzz:** 6 awards (2018–2025), for Design, Service. ## About ### Houzz Badges - Houzz Influencer - 1,000 Ideabook Saves a423 architecture & design inc was established in 2007 as an architecture firm focused on quality of design with great environmental sensitivity. Its founder and president, Maria Diaz-Joves, believes sustainability should not be just an option or trend but become a design standard without hindering quality and budget. The firm's mission is to strengthen the connection between the creative design process and the socio-economic and environmental realities of its context providing modern sustainable design for all and encouraging the development of struggling communities. a423 practices architecture as an innovative creative process which goes beyond the drawing board taking a hands-on approach in most projects. By merging the line between design and construction, we can manage quality, time and cost more effectively resulting into successful projects and happy clients. ### Services Provided - Architectural Design - Building Design - Home Remodeling - Architectural Drawings - Custom Homes - House Plans - New Home Construction - Home Additions - Home Extensions - Sustainable Design - Kitchen Design - Kitchen Remodeling - Floor Plans - Energy-Efficient Homes - 3D Rendering - Bathroom Design - Green Building - Space Planning - Universal Design - Historic Building Conservation - Basement Remodeling - Construction Drawings ### Areas Served - Lehigh Valley - Allentown - Bethlehem - Whitehall - Easton - Whitehall Township - Fullerton - Emmaus - Hanover Township - Quakertown - Wilson - Catasauqua - Hellertown - Fountain Hill - Palmer Heights - Coplay - Hokendauqua - North Catasauqua - Freemansburg - Bath - Coopersburg - Spinnerstown - Old Orchard - Raubsville - Cementon - West Easton - Richlandtown - Stiles - Riegelsville - Glendon - Northampton - Middletown - Ackermanville - Alpha - Center Valley - Finesville - Flicksville - Kintnersville - Old Zionsville - Ottsville - Phillipsburg ## Business Details | Field | Value | | --- | --- | | Business Name | a423 architecture & design, Inc. | | Address | 33 Penn St, Hellertown, Pennsylvania 18055, United States | | Phone | (610) 838-5100 | | Website | http://www.a423design.com | | Followers on Houzz | 55 | **Social profiles:** - Facebook — https://www.facebook.com/a423architectureanddesign/ - Blog — www.a423design.com ## Contact - **Houzz profile:** [a423 architecture & design, Inc.](https://www.houzz.com/professionals/architects-and-building-designers/a423-architecture-and-design-inc-pfvwus-pf~436606274) - **Website:** http://www.a423design.com - **Phone:** (610) 838-5100 ## Credentials - **Best of Houzz:** 6 awards (2018–2025), for Design, Service. ## Reviews **Overall rating: 5.0 out of 5 — 4 reviews** *Aspect averages:* - Work Quality: 5.0 - Communication: 5.0 - Value: 5.0 ### All 4 reviews **★★★★★ — Zachary Hartzell, July 2023** > a423 has been a pleasure to work with over the past two years. Maria is truly a kind and unique architect that values integrity of process and listens to her clients. She's thoughtful and has an ability to 'see' that's unmatched in the Lehigh Valley. She's a problem solver and a damn good one. Her partner Dave (HFS Group) is equally smart and aware of the building process. Their quotes, processes and services have gone above and beyond my expectations. If you're looking to build on a unique lot or want build using modern aesthetics, a423 is your team. **★★★★★ — Thomas Caldwell, Sept. 2016** > Maria is a consummate professional. Knowledgeable and friendly, she is accessible and easy to work with. She is good at turning client input into workable living space. She is also creative, an architect who thinks outside the box, rather than build them. > > I hope I have the opportunity to work with her again! **★★★★★ — Dan olortegui, Aug. 2016** > Ingenious and creativity are present in all and each space of our house, designed and built by A423 Architecture. The house basic design is site specific and incorporates functionality that fits our lifestyle. Clean lines, open spaces and primary materials, such as concrete, metal and wood define all the living areas of this house. Maria’s principles of honest, responsible and meaningful architecture prevailed in all the stages from concept up to when we occupied the home. All this on-time and on-budget! **★★★★★ — marciejack, April 2015** > My husband and I have been working with a423 for over a year planning and building our perfect house. The experience has been incredible. Every aspect has been enjoyable. There has not been a single detail overlooked. Her original ideas and creativity have made our dream house into a reality. If you love modern detail and clean lines a423 is the company for you. ## Selected projects - [33.5 live/work - Hellertown, PA](https://www.houzz.com/hznb/projects/33-5-live-work-hellertown-pa-pj-vj~2898422) - Location: Hellertown, PA - Photos: 17 - Description: 1000 sf living space connected with a trellis to an existing work area creating a private courtyard. - [Bright Modern Home - Allentown PA](https://www.houzz.com/hznb/projects/bright-modern-home-allentown-pa-pj-vj~2060661) - Location: Allentown, PA - Photos: 11 - [Sustainable Modern Home - Bath PA](https://www.houzz.com/hznb/projects/sustainable-modern-home-bath-pa-pj-vj~698608) - Location: Bath, PA - Photos: 14 - Description: Bank Barn inspired modern home using reclaimed materials, passive solar design and featuring geothermal heating and cooling to achieve a highly efficient house full of texture and character. - [Fabrication Projects](https://www.houzz.com/hznb/projects/fabrication-projects-pj-vj~7252878) - Location: Not specified - Photos: 22 [See all 4 projects](https://www.houzz.com/professionals/architects-and-building-designers/a423-architecture-and-design-inc-pfvwus-pf~436606274) --- *Source: Houzz professional profile. Reflects the profile as of 2026-11-07.*