--- title: "Terence L. Thornhill Architect — Architects & Building Designers | Houzz" canonical_html_url: https://www.houzz.com/professionals/architects-and-building-designers/terence-l-thornhill-architect-pfvwus-pf~815054531 markdown_url: https://www.houzz.com/md/professionals/pf~815054531.md entity_type: LocalBusiness business_name: "Terence L. Thornhill Architect" category: ["Architects"] image: https://st.hzcdn.com/fimgs/65936cc40501eac9_9313-w400-h400-b0-p0--.jpg address: "5804 RD. 90, Suite E, Pasco, Washington 99301, United States" latitude: 46.2492 longitude: -119.1044 phone: "(509) 547-8854" website: http://tltarch.com rating: 5 review_count: 3 followers: 29 last_updated: 2026-09-22 --- # Terence L. Thornhill Architect Original Houzz profile: [Terence L. Thornhill Architect](https://www.houzz.com/professionals/architects-and-building-designers/terence-l-thornhill-architect-pfvwus-pf~815054531) ## Professional summary - **Primary category:** Architects - **Location:** Pasco, WA - **Serves:** Seattle, Yakima, Kennewick, Pasco, Richland, West Richland, Finley, Burbank, Highland, West Pasco, Prossor - **Houzz rating:** 5.0 out of 5 (3 reviews) ## About ### Houzz Badges - 250 Ideabook Saves Terence L. Thornhill, Architect, INC. P.S. is a registered architectural corporation in the State of Washington, established by Tere and Katie Thornhill in 1994. We pride ourselves as a design oriented firm specializing in excellence of functionality and aesthetics with a definitive focus on project schedule and the budgetary bottom line. The firm is dedicated to the ideal that through sustainable architecture and quality design - buildings will "give back" to the community in an enduring way. Tere studied undergraduate Architecture at The University of Washington - School of Architecture in Seattle, Washington and graduate studies at University College Dublin - College of Architecture - in Dublin Ireland. Prior to establishing the firm of Terence L. Thornhill, Architect, Inc. P.S., Tere practiced architecture in London, England at the City of London Corporation and in Seattle, Washington with TRA Architecture, Engineering, Planning & Interiors and with Mithun Partners Architects and Interiors. It was in Seattle that Tere received awards in both contemporary design and historic preservation/ restoration. The firm was honored to receive the Mid-Columbia Small Business Association "Small Business of the Year" Gold Award in 1999 for employee relations and client service. Terence L. Thornhill, Architect enjoys a wide range of experience in both public and private projects including design and master planning of commercial offices, retail facilities, medical laboratories, physician offices, schools, churches, municipal facilities, hospitality facilities, residential remodels, custom and speculative residences, multi-family residences, and much more. ### Services Provided - Building Design - Home Remodeling - Custom Homes - House Plans - New Home Construction - Home Additions - Home Extensions - Kitchen Design - Sustainable Design - Kitchen Remodeling - Energy-Efficient Homes - Floor Plans - 3D Rendering - Green Building - Bathroom Design - Space Planning - Universal Design - Drafting - Historic Building Conservation - Structural Engineering - Basement Remodeling - Site Preparation - Construction Drawings ### Areas Served - Seattle - Yakima - Kennewick - Pasco - Richland - West Richland - Finley - Burbank - Highland - West Pasco - Prossor ## Business Details | Field | Value | | --- | --- | | Business Name | Terence L. Thornhill Architect | | Address | 5804 RD. 90, Suite E, Pasco, Washington 99301, United States | | Phone | (509) 547-8854 | | Website | http://tltarch.com | | Followers on Houzz | 29 | **Social profiles:** - Facebook — www.facebook.com/tltarch ## Contact - **Houzz profile:** [Terence L. Thornhill Architect](https://www.houzz.com/professionals/architects-and-building-designers/terence-l-thornhill-architect-pfvwus-pf~815054531) - **Website:** http://tltarch.com - **Phone:** (509) 547-8854 ## Credentials **Certifications & Awards** - MAME Award - Seattle Master Builders (1991 for the Florentine Condominiums in Seattle, WA)Gold Award- Mid-Columbia Small Business Award (1999) **Affiliations** - [National Association of Home Builders](https://www.houzz.com/professionals/schools-and-organizations/national-association-of-home-builders-pfvwus-pf~562065019) - [Home Builders Association of Tri-Cities](https://www.houzz.com/professionals/schools-and-organizations/home-builders-association-of-tri-cities-pfvwus-pf~630222633) ## Reviews **Overall rating: 5.0 out of 5 — 3 reviews** ### All 3 reviews **★★★★★ — mattandcatherine50, Sept. 2016** > We have worked with Tere twice. The first time we used his expertise was to design a kitchen and baths remodel and addition. His design work was excellent and in keeping with the original home. We have been very pleased! The second time we used him, we were, again, very pleased with his ideas, creativity and skill at putting our thoughts into a plan. Unfortunately, the cost estimates were too high for us to move forward at this time. We would definitely use him again! **★★★★★ — HU-432716, Sept. 2016** > Tere Thornhill does an excellent job for his clients. I have utilized his expertise and tallents on my home in Pasco Washington as well of a number of the facilities owned by my related business ventures located throughout the Tri-Cities area. His work is always very professional, performed on time to meet pre-established commitments and always with a touch of well appreciated class. Bill Lampson **★★★★★ — Ron Grant, Sept. 2016** > I recently hiredTere Thornhill and his architectural firm for the remodel of my recently purchased home on the Columbia River. I had some definite ideas of features that I wanted and Tere did an excellent job of incorporating and supplementing them during the design process. He also had excellent suggestions for alternatives as we worked toward the final design. ## Selected projects - [Riverfront Craftsman Remodel](https://www.houzz.com/hznb/projects/riverfront-craftsman-remodel-pj-vj~980561) - Location: Pasco, WA - Photos: 49 - Description: A custom remodel turned into a craftsman style home situated along the Columbia River in Pasco, Washington. An open living concept was created to take advantage of the incredible river view from as many areas of the home as possible. Wooden “solid sawn” beams were used extensively to create a craftsman appeal while also taking advantage of the lower roof pitch and deeper overhangs. This roof configuration allows for mitigation of the summer interior heat gain while providing for thermal enhancem… - [River Horse Ranch](https://www.houzz.com/hznb/projects/river-horse-ranch-pj-vj~980604) - Location: Richland, WA - Photos: 29 - Description: Located on 23 riverfront acres in mostly agrarian and pastureland, this two level farmhouse style home is situated to take advantage of the sweeping landscape without harming the natural beauty of the site. Board and batten vertical cedar is the material utilized for the exterior finish, with accent of natural stone. A standing seam metal roof gives the home the reminiscent feeling of the farmhouse vernacular. Hydronic "in-slab" floor heat was designed for all living spaces within the home, whic… - [Hillside Contemporary](https://www.houzz.com/hznb/projects/hillside-contemporary-pj-vj~980587) - Location: Richland, WA - Photos: 7 - Description: A centralized entry gallery separates public and private living areas one from another. The gallery is enhanced by a vaulting translucent skylight, which gives the home a distinctive visual focus. A playful arrangement of windows around the home allows for natural daylight into the interior space in an interesting cascade of light. Exterior roof decks were designed to provide outdoor living space and take advantage of the expansive views from virtually all areas of the home. - [Hilltop Contemporary](https://www.houzz.com/hznb/projects/hilltop-contemporary-pj-vj~980593) - Location: Richland, WA - Photos: 11 - Description: The owners of this hilltop residence overlooking an established golf course desired a Southwest theme. Stepping planes and deeply recessed window walls are the hallmark design accompanied by the natural grasses and significant boulders that mark the drive to the residence from the street. The parapet walls surrounding the home conceal rooftop HVAC equipment and numerous skylights allowing natural light into the interior spaces. The use of stucco was incorporated as an exterior finish material in… - [Canyon Lakes Villas](https://www.houzz.com/hznb/projects/canyon-lakes-villas-pj-vj~980537) - Location: Not specified - Photos: 11 - Description: A sloping lot was a central influence in the design of this Mediterranean style home. A stucco exterior finish, rounded corners and window forms, and double circular roof elements create a distinctive play of form and mass for this unparalleled golf course frontage home.A concrete deck and rail system wrap the view side of the home providing the homeowner with uninterrupted access to outdoor living space. A freestanding circular staircase links the upper and lower level as does a residential ele… - [Estate at Destiny Ridge](https://www.houzz.com/hznb/projects/estate-at-destiny-ridge-pj-vj~1193758) - Location: Paterson, WA - Photos: 25 - Description: This residence rests on a steep hillside overlooking the Columbia River near Crow Butte State Park. Much of the hillside has been blasted away to make room for the 3,500 square foot wine cave which will also serve as part of the foundation for the home. The wine cave features a complete kitchen facility, barrel room, tank room, racking room, and dining room. The dining room leads out to a patio overlooking the river. The residence also features three complete bedroom suites, an observation tower… - [Riverfront Lodge](https://www.houzz.com/hznb/projects/riverfront-lodge-pj-vj~1637216) - Location: Pasco, WA - Photos: 12 - Description: This exclusive home is situated on three contiguous lots along the Columbia River in Pasco, Washington. Three levels of space create this lodge style home, with lower level space “day-lighted” on the riverside and the uppermost bonus level situated in captured space above the garages. The structural system for the home includes a structural steel post and beam framework supporting the metal deck and concrete slab spanning over the spacious daylight basement area. Mica-slate floors extend in all… - [Kitchen Expansion & Update](https://www.houzz.com/hznb/projects/kitchen-expansion-and-update-pj-vj~1660224) - Location: Richland, WA - Photos: 10 - Description: An interior layout was updated to create a more modern, user friendly, and open floor plan. A fireplace and brick accent wall were extended to create a warm and cozy family room off of the kitchen. The large island, with an oven hood and blown glass pendant lights, add a modern twist to this otherwise classic style kitchen. The ceiling was raised and an exposed timber support beam was added to tie in the modern and rustic feeling of this remodel. - [Backyard Upgrade](https://www.houzz.com/hznb/projects/backyard-upgrade-pj-vj~1655541) - Location: Richland, WA - Photos: 12 - Description: A large, open backyard was transformed from a field of grass to a beautiful getaway. The original gazebo tied into the new design thoughtfully. A standard size tennis court with a basketball hoop on one end allows the homeowners to utilize their new backyard for outdoor sports. The large poolside patio is perfect for outdoor entertaining. A pool with a hot tub, a trellised walkway, and a fountain complete this upgrade. - [Stucco Ranch Home Expansion](https://www.houzz.com/hznb/projects/stucco-ranch-home-expansion-pj-vj~1238938) - Location: Kennewick, WA - Photos: 5 - Description: This stucco Ranch style home was updated and expanded. A new entry statement, along with garage expansion, kitchen expansion, and back patio - including an underground hot tub, completed this remodel. - [Traditional Cottage Home Remodel](https://www.houzz.com/hznb/projects/traditional-cottage-home-remodel-pj-vj~1235108) - Location: Richland, WA - Photos: 11 - Description: The front of this cottage Style home was designed to have curb appeal. A tree was removed from the front walkway and an entry statement with additional space was added, expanding the square footage. - [Rural Home](https://www.houzz.com/hznb/projects/rural-home-pj-vj~1232439) - Location: Pasco, WA - Photos: 6 - Description: The owners of this beautiful two story home wanted to take advantage of the view from the back side of the home, which looks out over one of the farm circles. The design incorporated a large expansive rear covered deck and easy access to the yard area. The roof of the home was stick framed to allow for the utilization and occupation of dormered areas. The exterior of the home is finished with a finely detailed stucco system, with flattened arch forms over many doors and windows. - [Stucco & Stone Craftsman with a View](https://www.houzz.com/hznb/projects/stucco-and-stone-craftsman-with-a-view-pj-vj~1653247) - Location: Pasco, WA - Photos: 22 - [Riverfront Terracotta](https://www.houzz.com/hznb/projects/riverfront-terracotta-pj-vj~1648712) - Location: Pasco, WA - Photos: 3 - Description: Expansive covered decks, daylight basement, and abundant glazing are features of this prominent riverfront home. Built, utilizing concrete wall and floor system, insulated composite roof panels and in-slab hydronic floor heat; this efficient and beautiful dwelling takes full and complete advantage of the 180-degree view. The exterior finish is a meticulously detailed stucco wall, soffit, and fascia with terracotta roof tiles. Double chimney pronouncements break up the roof form and create an ext… - [Golf Course Home Remodel](https://www.houzz.com/hznb/projects/golf-course-home-remodel-pj-vj~1648649) - Location: Richland, WA - Photos: 8 - Description: The owner, in addition to substantial plan and structural related alterations, desired a complete change of architectural character. The kitchen area was relocated and expanded, the entry area was relocated and defined in a more appropriate way, the lower level spaces were renovated, and garage space was added. An entry statement was added at the approach to the home, providing an unquestionable sense of arrival. - [Riverfront Redesign](https://www.houzz.com/hznb/projects/riverfront-redesign-pj-vj~1639865) - Location: Pasco, WA - Photos: 12 - Description: Originally constructed as a 1970’s vintage rambler, this riverfront home underwent a total architectural transformation through the addition of approximately 1,500 square feet and renovation of existing space. A new roofline was created through the introduction of new roof trusses, carefully installed to retain the existing ceiling treatment in several rooms. The kitchen area was opened to the family room, creating a great room concept. Formal entry, dining, and living rooms were added to the fr… - [Riverside Overlook Renovation](https://www.houzz.com/hznb/projects/riverside-overlook-renovation-pj-vj~1642126) - Location: Pasco, WA - Photos: 8 - Description: This Riverside Overlook home was transformed from a dark wood exterior to a lighter more appealing finish. The owner of this home presented Terence L. Thornhill, Architect with the desire to remove the oversized fireplace and chimney in order to open up the river facing side of the residence, taking full advantage of the expansive view that they were missing out on because of the obstructions. A large wooden deck was added to the back to make room for more outdoor entertaining. - [Hilltop View Expansion](https://www.houzz.com/hznb/projects/hilltop-view-expansion-pj-vj~1641589) - Location: Richland, WA - Photos: 7 - Description: The longtime owners of this remote hilltop, panoramic view home desired to create an upgraded stylistic appeal to their 1970’s vintage flat roof home. A bronze colored, standing seam metal barrel vaulted central roof form was added over the kitchen area, tying together the new architectural personality of the home. In addition to expanding the family room area, opening the kitchen, reconfiguring the master bedroom, and enlarging the entry foyer – a deeper, more articulated fascia treatment was a… - [Riverfront Expansion & Remodel](https://www.houzz.com/hznb/projects/riverfront-expansion-and-remodel-pj-vj~1639771) - Location: Pasco, WA - Photos: 17 - Description: The 1960’s era, daylight basement home was totally transformed from a mundane concrete block home, with small windows and an uninteresting roofline, into a contemporary stucco home with a translucent skylight, re-organized rooms, and extensive exterior deck improvements. The home features a master bedroom with a sitting room and fireplace, and a living room that was converted into a large family room adjacent to the open kitchen. Complete retrofit of electrical, heating and air conditioning, and… - [Riverfront Pool & Patio Addition](https://www.houzz.com/hznb/projects/riverfront-pool-and-patio-addition-pj-vj~1639697) - Location: Pasco, WA - Photos: 18 - Description: The owner of this residence desired to take advantage of the beautiful outdoor view of the Columbia River, even in inclement weather. This necessitated the design of a covered trellis area with a structural glass “windbreak”. The trellis serves to provide shelter for outdoor activities and serves as the centerpiece of a vibrant outdoor activity setting. This outdoor area includes a vanishing edge swimming pool connecting the observer – “water to water” with the swimming pool to the Columbia Rive… [See all 26 projects](https://www.houzz.com/professionals/architects-and-building-designers/terence-l-thornhill-architect-pfvwus-pf~815054531) ## Ideabooks - [Outdoor Ideas](https://www.houzz.com/ideabooks/52506106/list/outdoor-ideas) — 13 ideas - [Living Room](https://www.houzz.com/ideabooks/52299766/list/living-room) — 1 idea - [Curb Appeal](https://www.houzz.com/ideabooks/55687105/list/curb-appeal) — 2 ideas [See all 3 ideabooks](https://www.houzz.com/ideabooks/users/tltarch) --- *Source: Houzz professional profile. Reflects the profile as of 2026-09-22.*