Cumulus Architecture + Design LLC

Architecture Firm Charleston, SC
63 / 100

BizScore

Top 100% How we score
48
AI Visibility
—
AI Ready
—
AI Agent ReadinessNot audited yet
73
SEO Performance
—
Freshness
100
Google Rating
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Contact Information

Location

About Cumulus Architecture + Design LLC

Cumulus Architecture + Design LLC is an Architecture Firm in Charleston, SC, located at 42 Warren Street. The firm specializes in helping clients build and renovate homes throughout the Lowcountry, including Charleston, Kiawah Island, Mt. Pleasant, and New York City. Founders Robbie and Abby Lesslie have been practicing since 2005 and founded the firm in 2011. They hold a 5.00 rating based on 2 reviews.

Robbie and Abby Lesslie met at NC State University’s College of Design, where Abby earned a bachelor of architecture and Robbie a master of architecture. Abby also holds a bachelor of environmental design from NC State, and Robbie holds a bachelor of construction management from Appalachian State University. After graduation, Abby worked in Barcelona, Spain, and Robbie completed his masters at the Prague Institute of Architecture in the Czech Republic. They later worked in Charleston, with Abby at LS3P and Robbie at Christopher Rose architects. They married in Costa Rica, traveled through Europe, and founded Cumulus upon returning. Their work has been featured in Architectural Digest and Luxe Magazine.

The design process begins by studying the site and listening to the client’s vision. The Lesslie sketch concepts and refine them into an initial design. They engage with local jurisdictions, present the concept, and generate construction documents for pricing. After reviewing pricing with the client and builder, they finalize the design and provide all details for construction. They act as the agent of design, coordinating other disciplines to create a cohesive drawing set. Throughout construction, they maintain regular contact with builders and craftsmen, conducting site visits for inspections and answering questions via phone, text, and email. After the client moves in, they generate a final punch list and remain available for future questions.

The firm’s portfolio includes completed projects such as Rivercourse, Ocean Escape, Seascape, Marshview Haven, Home on the Bluff, Sanctuary, Cassique III, Kiawah Coastal, Cassique II, Ocean Park III, Ocean Park II, Cassique I, Ocean Park, Settlement, Shingle Style, Tranquil, the Lantern House, the Retreat, Haven, Serenity, the Savanna, and Sketches. They also offer services related to Sketchbook.

Cumulus Architecture + Design LLC combines the founders’ extensive educational background and international experience to deliver custom architectural solutions in Charleston, serving the Lowcountry with a focus on personalized design and client collaboration.

The firm is situated on Warren Street in Charleston, just a short walk from the Warren Place Garden and the Charleston Medical Clinic.

BizScoreAI awards Cumulus Architecture + Design LLC a Discoverability score of 100 out of 100, which ensures AI crawlers can access and find every page of the website. The business also achieves a Technical score of 95 out of 100, confirming that the site is secure and structured for search engines to read without errors.

Score Summary

BizScoreAI scanned the website cumulusarchitecture.com on September 21, 2026. Cumulus Architecture + Design LLC has a BizScore of 63 out of 100.

  • AI Visibility48 out of 100
  • SEO73 out of 100
  • Google rating5.0 out of 5

AI visibility scan by category: AI Discovery 25 of 25 points, Structured Data 8 of 25 points, Content Readiness 3 of 30 points, AI Trust Signals 12 of 20 points.

Website audit sub-scores (out of 100): On-Page 63, Technical 95, Performance 83, Content 51.

Strengths: 6 checks passed. llms.txt, AI Crawler Access, AI Content Blocking, Organization Schema, About/Team Page, XML Sitemap.

Areas to improve: 7 checks. FAQPage Schema (failed), Q&A Content (failed), Content Too Thin (failed), Meta Description (failed), Speakable Schema (warning), Weak Heading Structure (warning), Author Signals (warning).

AI engine reads

Read by AI engines 5 times in the last 30 days.

Counted from AI crawler and assistant visits to this page, identified by user agent.

See the full AI visibility report for this business

Contact Cumulus Architecture + Design LLC

AI Visibility Score

How visible is this business to AI-powered search engines

48 /100
AI Discovery
100/100
Structured Data
32/100
Content Readiness
10/100
AI Trust Signals
60/100

Ways to improve this score

FAQPage Schema Missing
Q&A Content Missing
Content Too Thin
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SEO Score

Technical SEO health and search engine optimization

73 /100
On-Page
63/100
Technical
95/100
Performance
83/100
Content
51/100

Ways to improve this score

Improve Content
Improve On-Page

Local SEO Coverage

Directory presence and NAP consistency

— /100
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