Allison Ong Shreffler, Architecture + Design LLC

09/25/2026

SERENE SPA SOLARIUM (part of TIMELESS TUDOR)


Designed as a private wellness pavilion within a newly constructed Tudor residence, this solarium spa retreat blends architectural refinement with restorative living. The homeowners envisioned a sophisticated European-inspired sanctuary that would accommodate relaxation, hydrotherapy, and exercise within a serene, light-filled environment.

The open space integrates a relaxation pool, hot tub, sauna, steam room, and fitness studio.

Architectural rhythm and material continuity unify the program, while glass partitions subtly separate the gym, maintaining visual openness without disrupting the tranquil spa atmosphere.

Natural light is central to the design composition. Two skylights—strategically positioned above the relaxation pool and hot tub—create vertical shafts of daylight that animate the water and enhance the sensory experience. Surrounding double-hung windows frame expansive views of the owners’ estate, reinforcing the connection between interior wellness and the surrounding landscape.

A combined bathing and changing area are located adjacent from the carefully orchestrated open plan.

A custom vanity and 36” x 42” LED mirror flanked by Mill Valley wall sconces takes center stage of the changing area.

Material selections emphasize durability and understated elegance. Large-format Italgraniti porcelain tile wraps the walls, while smaller 2” x 2” mosaics are inlaid the shower and changing area floors.

Combining 12” × 24” modules with elongated 4” × 24” tiles in a linear pattern creates subtle movement and scale. The pool and hot tub are clad in shimmering mosaic glass tile designed to evoke gentle rainfall, adding depth, reflection, and a calming visual texture.

The result is a refined solarium that transforms everyday wellness into a luxurious architectural experience.

09/04/2026

Having Simply the Best Time at the Simply the Best 2026 Gala! Once again, thank you readers of Harrisburg Magazine for voting us as Simply the Best for Architecture Services and Reader’s Choice for Interior Decor & Design!

08/20/2026

We’re so excited to seeing this custom remodel finished! Great collab with Cornerstone Custom Builders Inc. as always!

08/17/2026

Thanks for your votes, readers of Harrisburg Magazine ! We are thrilled that our Small, Diverse, Woman Owned Business was voted Simply the Best for Architecture Services and Reader’s Choice for Interior Decor & Design!

07/25/2026

06/29/2026

Honored and deeply grateful to be recognized as a recipient of the Women of Influence 2026 Award.

This recognition is especially meaningful because it celebrates women who are making a difference through leadership, innovation, and service to their communities. Throughout my career, I’ve been fortunate to combine my passions for architecture, interior design, mentoring, and community involvement into work that I truly love.

I’m incredibly thankful to my clients who trust us with their homes and businesses, my talented team and industry partners, my family for their unwavering support, and everyone who has been part of this journey over the past 30+ years.

At Allison Ong Shreffler Architecture & Design, we remain committed to creating spaces that are Useful, Sustainable, and Beautiful while building lasting relationships with the people we serve.

Congratulations to all of the inspiring Women of Influence honorees!

06/26/2026

Congratulations to all of the inspiring Women of Influence honorees! It is a privilege to be recognized alongside such an accomplished group of leaders.

Thank you to the Central Penn Business Journal for this incredible honor!

Thank you to everyone for coming out to celebrate these wonderful Women of Influence!

06/01/2026

TIMELESS TUDOR (interior)

Throughout the residence, every detail — from the grand stair in the entry foyer to the bespoke Tudor arch front door —exudes a sense of history and craftsmanship. Oak floors with inlaid border designs add a touch of warmth and sophistication to the interior spaces.

An alfresco dining room, nestled within a courtyard flanked by folding doors, offers a seamless transition between indoor and outdoor living, providing a tranquil oasis for family gatherings and celebrations.

The kitchen features hickory cabinetry custom designed around an apron farmhouse sink, wall ovens and a 36” side-by-side refrigerator/freezer. A gas cooktop and wall mosaic is accentuated by the custom copper-rose range hood with copper apron trim. Perla Venata quartzite countertops, ivory beige travertine subway backsplash and hexagon floor tile
further enhance the home’s authentic charm.

Adjacent to the kitchen, a butler’s pantry outfitted with extra storage and bar with a sink, ice freezers and coffee station makes getting ready for the morning with a growing family more functional.

Classic marble tile by Jeffrey Court adorns all the bathrooms, infusing each space with timeless luxury and refinement.

The powder room presents a custom made vanity with a black marble countertop. A two light bracket Weston vanity sconce reveals the intricate tile patterns. The full height 3x6 beveled subway tile is partitioned by the 1x3 staggered mosaics and aspen white pencils. Penny round floral pattern field and 6” black penny round border marble systems are inlaid into the floor.

The in-law suite bath is, of course, no exception to ornate finishes - new palm beach calacatta/rose desert tile bar with honed 12x24 Casablanca Florida bath tile embroider the room. The bath exhibits a custom double vanity and walk-in-shower inlaid with 2x2 calacatta gold floor tile.

05/12/2026

TIMELESS TUDOR (exterior)

We had the privilege of collaborating with clients who shared a deep appreciation for the timeless elegance of old homes, particularly American Tudor and Victorian architecture. When they entrusted us with the task of crafting a custom home design, we knew it would be a labor of love, evoking the quintessential charm of Mainline Philadelphia suburbs while embodying the essence of a cherished family sanctuary.

Every aspect of multiple award-winning design was meticulously curated, with a keen focus on materials that would honor the legacy of classic architecture. The exterior facade features real granite stone, copper turrets, dormers, and cupolas, adorned with simulated slate roofing that seamlessly blends tradition with modern durability. Bespoke copper lantern fixtures by Bevolo illuminate the exterior, casting a warm glow that beckons visitors to explore further.

This custom Tudor-style stone residence seamlessly blends old-world charm with contemporary outdoor living. Designed for year-round enjoyment, the landscape features intimate courtyards, open-air dining, and a sophisticated entertaining space that reflects Tudor elegance with modern luxury.

Two enchanting courtyards flank the dining area, one with a built-in gas-fired stone fire pit for cozy gatherings. Folding glass partition doors dissolve the boundary between indoors and out, enhancing alfresco dining and connection to the surrounding spaces.

A covered patio, anchored by a custom-built grill beneath a hand-crafted stone arch, provides a refined entertaining area. Italgraniti porcelain pavers and Doric-style columns enhance the architectural grandeur, while a wood-look plank ceiling adds warmth and texture.

Meticulously curated details—from fire-lit courtyards to timeless stonework—create a harmonious balance of sophistication and functionality, honoring the Tudor tradition while elevating outdoor living with enduring beauty and craftsmanship.

04/27/2026

Thank you Builders Association of Metro Harrisburg for recognizing Allison Ong Shreffler Architecture & Design will multiple Pyramid Awards this year!

• Distinguished Professional Architect of the Year
• Best Collaboration over $1,000,000
(w/ Roland Builder)
• Best Interior Design under $400,000
• Best Addition Over $149,000
• Best Specialty Space over $900,000
(w/ Cornerstone Custom Builders)
• Best Specialty Space $300,000 - $600,000
(w/ Cornerstone Custom Builders)
• Best Architectural Design $1,000,000 - 3,500,000

Our sincere thanks to our clients, builders, craftsmen, vendors, and our talented team. Your trust and collaboration make it possible for us to create homes that are not only beautiful, but deeply personal and lasting.

Swipe through to see highlights from our award-winning projects!