What Thomas Sebold & Associates does

Thomas Sebold & Associates is a privately held luxury general contractor headquartered in Bloomfield Hills, Michigan, founded in 1955 by architect Thomas Sebold and now owned by Glenn and Dana Kunnath following the 2016 ownership transition. The firm builds approximately 20 high-end custom homes per year in the 5,000 to 35,000 square foot range, alongside commercial construction (office, retail, country clubs, high-end condominiums), renovation and restoration (including historic work such as the Yamasaki residence), and a recurring TSA Home Care maintenance division. Operations are supported by an in-house estimating department that produces multi-bid subcontractor scopes, daily on-site project management, a dedicated Safety Director, in-house custom carpentry, and 24/7 post-completion service.

The go-to-market is sales-led and relationship-based, with owner Glenn Kunnath personally involved in each project and the majority of new business originating from word-of-mouth referrals, prior clients, and long-standing architect partnerships (Yamasaki, Hugh Newell Jacobson, Young & Young, DesRosiers, Ike Kligerman Barkley, Neumann/Smith). Pricing is quote-based per project with no standardized rate card, given the bespoke scope of each residence; contract durations extend across multi-year build cycles. The firm has a Northern Michigan office in Petoskey (opened 1995) to serve Bay Harbor and surrounding projects, but operates exclusively within Michigan.

The customer base is concentrated in high-net-worth individuals seeking custom estates and waterfront retreats, with periodic commercial anchor clients such as Alden Development Group. Brand equity is reinforced by press features in Architectural Digest (1990, 2005, 2025), Traditional Home, Better Homes & Gardens, and Midwest Living, and by a roster of named clients including Bob Seger and Compuware's Peter Karmanos. Headcount is approximately 30 professionals; revenue is not publicly disclosed.

Name

Thomas Sebold & Associates

Legal name

Thomas Sebold & Associates

Website

https://tsagc.com

Company type

Private

Founded year

1955

Operating status

Operating

Headcount range

11–50 employees

Short description

Thomas Sebold & Associates is a privately held Michigan luxury general contractor founded in 1955, building approximately 20 high-end custom homes per year (5,000–35,000 sq ft), plus commercial, renovation, and recurring home-care services for high-net-worth individuals.

Ownership category

akta.pro rank

Product category

Luxury Custom Home Construction

NAICS

Residential Remodelers (236118), New Housing For-Sale Builders (236117)

SIC

General Bldg Contractors - Residential Bldgs (1520)

akta.pro primary industry

Custom Home Building (IMAFABAC)

akta.pro secondary industries

Luxury Whole-Home Renovation (High-End Finishes & Custom Build) (HSAPAEAI), Residential Design-Build & Renovation-Integrated Builders (IMAFABAE)

Keywords

• Luxury custom home construction
• Residential general contracting
• Home renovation restoration
• Commercial construction services
• Estate maintenance services

Headquarters

HQ city

Bloomfield Hills

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Others

Revenue model

1. Custom Home Construction: Building luxury custom homes ranging from 5,000 to 35,000 square feet. Primary revenue driver with approximately 20 high-end homes completed per year. Projects include estates, waterfront retreats, and distinctive luxury residences in Michigan.
2. Commercial Construction: Office buildings, retail centers, country clubs, restaurants, and high-end condominium developments. Full range of services from design consultation to general contracting to project management.
3. Renovation and Restoration: Home and commercial space renovations including kitchen remodels, large scale additions, historic restorations, and modern renovation projects that blend seamlessly with existing structures.
4. TSA Home Care: Post-completion maintenance services including bi-annual home maintenance inspections, coordination of house staff and tradespeople, personal concierge service, and seasonal preparation services.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Thomas Sebold & Associates is a Michigan-based luxury custom home builder providing full-service general contracting for high-end residences (5,000 to 35,000 square feet), commercial construction, and renovation/restoration projects. The company employs approximately 30 professionals and completes about 20 high-end custom homes per year, supported by a dedicated estimating department, daily onsite project management, a Safety Director program, in-house custom fabrication capabilities, and a post-completion TSA Home Care service division.

Product overview

Thomas Sebold & Associates operates as a single-service construction company offering luxury custom home building as its core offering. The company's service portfolio comprises four interconnected divisions: Custom Home Construction (the foundational core service), Renovation and Restoration, Commercial Construction, and TSA Home Care (a post-completion maintenance service that extends client relationships after initial construction is complete). The company builds approximately 20 high-end homes per year, ranging from 5,000 to 35,000 square feet.

Differentiator

Problem solved

Functional benefit

Brands

• TSA Home Care: A service division of TSA that provides ongoing maintenance and support for TSA clients after project completion, including routine home care, seasonal preparation, and estate management services.

Products and services

• Custom Home Construction
• Renovation and Restoration
• Commercial Construction
• TSA Home Care

Quantifiable outcome

• Approximately 20 high-end homes built per year with sizes ranging from 5,000 to 35,000 square feet
• +1 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Eight partnerships are on record, tiered core, flagship and regular.

• Alden Development GroupcoreStrategic or Co-development Partner · 1 January 2017TSA became the General Contractor of choice for the Brookside Condominium Project in downtown Birmingham, MI in 2017. TSA was contracted to build the lobby, fitness and social rooms, the ADG office, all common areas, and all 30 condo units within the development.
• Hugh Newell JacobsonflagshipStrategic or Co-development Partner · 1 January 1989Renowned architect known for his fresh take on American vernacular style. Designed the Kirk In The Hills residence which TSA built in 1989, featured in Architectural Digest 1990. The home showcases TSA's ability to execute sophisticated architectural designs.
• Minoru YamasakiflagshipStrategic or Co-development Partner · 1 January 1970World-renowned architect of the original World Trade Center. TSA built his Bloomfield Hills home in the early 1970s. The new owners returned to TSA in 1999 for a modern renovation of the residence, designed by architect Lynda Charfoos. This partnership established TSA's reputation for quality with prestigious architectural clients.
• Young & Young ArchitectscoreTechnology or IntegrationLongstanding architectural partnership on multiple projects including Bloomfield Hills Residence, Ann Arbor Residence, and Bay Harbor residences. Architects with strong reputation in Michigan luxury home market.
• DesRosiers ArchitectscoreTechnology or IntegrationPartnership on multiple luxury residential projects including West Bloomfield Residence and Franklin Residence.
• Alexander V. Bogaerts & AssociatescoreTechnology or IntegrationFeatured on Bay Harbor Residence project. Partnership with architect Alexander Bogaerts known for distinctive Michigan luxury homes.
• Ike Kligerman Barkley ArchitectscoreTechnology or IntegrationFeatured on Bloomfield Hills Residence project. National architecture firm with residential design expertise.
• Neumann/Smith ArchitectureregularTechnology or IntegrationPartnership on Bloomfield Hills Residence 2 and Bloomfield Renovation projects.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Compass Construction: Michigan-based custom home builder serving the Metro Detroit luxury market with comparable project scale and client demographics. Direct peer in the same geography targeting similar HNW clientele with bespoke custom construction.
• Peter A. Lang Custom Homes: Long-established Michigan luxury custom home builder based in Bloomfield Hills, serving the same HNW segment with similar project sizes and architect partnerships. Operates in the identical geographic market as TSA.
• Frankel Building Group: Houston-based luxury custom home builder serving ultra-HNW clients with similar project scale, architect collaboration focus, and bespoke service model. Comparable in business model though operating in a different luxury market.
• John Kraemer & Sons: Minnesota-based luxury custom home builder with similar high-end project scope (multi-million dollar residences) and relationship-based sales model. Comparable operating model in a different upper-Midwest geography.
• Meadowlark Builders: Michigan custom home builder serving the luxury segment in the greater Detroit area. Comparable in scale, project size, and target client profile to TSA's custom home business.
• Shelter Construction: Michigan-based custom home and renovation builder serving luxury clients in the Metro Detroit region. Operates in the same geographic market with overlapping customer base and similar project type.
• JDK Homes: Michigan luxury custom home builder focused on high-end residential construction in the Metro Detroit area. Comparable scale, customer profile, and project scope to TSA's core offering.

Regional players

• Ilex Construction: Florida-based luxury custom home builder serving ultra-HNW clients with similar bespoke project approach. Comparable in business model but operates in a different regional luxury market (Florida) rather than Michigan.

Broad incumbents

• Arthur Rutenberg Homes: National franchise network of custom home builders serving luxury clients across multiple states. Similar custom home product offering to TSA but operates through franchise model with broader geographic reach.
• Toll Brothers: National luxury home builder operating at significantly larger scale across many markets. Overlaps with TSA in luxury positioning but competes primarily in production-style luxury development rather than the pure custom segment TSA dominates.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xtwitter.com/tsagc
• LinkedInlinkedin.com/company/thomas-sebold-and-associates-inc.
• Facebookfacebook.com/profile.php

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Thomas Sebold & Associates