The Kastrop Group
The Kastrop Group is a family-owned, full-service architecture firm in Redwood City, California, founded in 1987, that designs commercial, residential, public, and ADU projects for Bay Area clients on an hourly professional-services basis.
- Company typePrivate
- Founded1987
- HeadquartersRedwood City, United States
- Headcount1–10
- GTM typeB2B and B2C
- OfferingServices
What The Kastrop Group does
The Kastrop Group, Inc. Architects is a privately held, full-service architecture firm founded in 1987 and headquartered in Redwood City, California. The firm designs commercial, residential, and public projects for clients across the San Francisco Bay Area, with a particular emphasis on residential remodels, additions, accessory dwelling units (ADUs), tenant improvements, and sustainable or all-electric design. Its principal, D. Michael Kastrop, A.I.A., is a licensed architect, supported by Lorianna Kastrop as VP/CFO; the firm is family-owned with no outside investors or parent company.
The firm operates a traditional architecture practice using Computer Aided Design and Drafting (CADD) systems for drawings, plans, elevations, and specifications, supplemented by expertise in passive building design, energy-efficient methods, ADA-compliant design, and LEED/sustainable architecture. A signature proof point is the firm's own 699 sq. ft. Kastrop Casita ADU in Redwood City, built as an all-electric, ADA-accessible, solar-plus-storage showcase project that won the Peninsula Clean Energy 2023 All-Electric Leader award.
The business model is professional services billed hourly against actual time worked (not fixed fees), with project fees typically running 8-12% of construction cost and an initial free one-hour consultation limited to Bay Area property owners. The go-to-market is sales-led through content marketing (blog, Houzz, LinkedIn, Facebook, Twitter/X), direct website and phone inquiries, and recurring partnerships with structural engineers and contractors such as DRE Structural Design, EMC Construction, and DLR Construction. Customer segments are homeowners/SMBs as the primary base, with commercial property owners as a parallel horizontal segment and public entities as a smaller vertical.
The Kastrop Group firmographics
Firmographics- Name
- The Kastrop Group
- Legal name
- The Kastrop Group, Inc.
- Website
- https://kastropgroup.com
- Company type
- Private
- Founded year
- 1987
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- The Kastrop Group is a family-owned, full-service architecture firm in Redwood City, California, founded in 1987, that designs commercial, residential, public, and ADU projects for Bay Area clients on an hourly professional-services basis.
- Ownership category
- akta.pro rank
Where The Kastrop Group is headquartered
LocationHeadquarters
- HQ city
- Redwood City
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
The Kastrop Group business model
Business model- GTM type
- B2B and B2C
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales
Revenue model
- Architectural Design Services: The firm bills hourly for actual time worked, not a fixed fee. After an initial site visit, they provide a written proposal and estimate based on 30+ years of experience with diverse project types. They typically estimate Existing Conditions and Preliminary Design phases as a beginning step, then provide detailed estimates for Design Development and Construction Documents phases. Additional services are billed separately if project scope expands or multiple redesigns are necessary. Construction Administration is also billed by the hour on an as-needed basis.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | Hourly billing for architectural services with project-specific estimates |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels6 records
The Kastrop Group product offering
Product offeringCore offering
The Kastrop Group is a full-service architecture firm that designs buildings and prepares construction documents for residential, commercial, and public projects in the San Francisco Bay Area. Services span from existing conditions assessment and preliminary design through design development, construction documents, and construction administration, with specialization in green/sustainable design, energy-efficient solutions, and Accessory Dwelling Units (ADUs). The firm is led by a licensed Principal Architect and operates from Redwood City, California, with 37+ years of practice.
Product overview
The Kastrop Group is a full-service architecture firm providing comprehensive architectural design services for Commercial, Residential, and Public projects in the San Francisco Bay Area. Their core offerings include Residential Work, Commercial Work, Public Work, and Accessory Dwelling Units (ADUs), supported by their multi-phase Design Process Services. The firm specializes in Green Design and Sustainable Architecture, integrating energy-efficient solutions like solar panels and home batteries. Their services span from initial Existing Conditions assessment through Preliminary Design, Design Development, Construction Documents, and Construction Administration. The firm gained recognition with their Kastrop Casita ADU project, which received the Peninsula Clean Energy 2023 Award for Outstanding Residential Construction.
Differentiator
Problem solved
Functional benefit
Products and services
- Full-Service Architecture
- Residential Work
- Commercial Work
- Public Work
- Accessory Dwelling Units (ADUs)
- Green Design / Sustainable Architecture
Quantifiable outcome
- ADU construction cost of $470 per square foot for their own 699 SF ADU project
Companies that use The Kastrop Group
Customer profileNamed customers2 records
Segments3 records
Ideal customer profiles3 records
The Kastrop Group technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature2 records
The Kastrop Group partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- DRE Structural DesigncoreStructural engineering partner for the Kastrop Casita ADU project. Provides structural engineering analysis and design for construction projects.
- EMC ConstructioncoreGeneral contractor for the Kastrop Casita ADU project. Steve Barnes Construction dba EMC Construction.
- EnergyPalminorSolar energy broker that connected The Kastrop Group with SunPower for their ADU solar installation. Worked with them to resolve interconnection issues with PG&E.
- DLR ConstructioncoreGeneral contractor for the 1528 S El Camino Real Office Roof Garden project in San Mateo.
Scale indicators1 record
Recent moves5 records
Expansion highlights4 records
The Kastrop Group competitors and assessment
Company assessmentDirect peers
- EHDD: Long-established Bay Area architecture practice serving residential, commercial, and public clients with a strong sustainability ethos. Comparable in service breadth, regional focus, and emphasis on green design.
- Studio VARA: San Francisco-based architecture practice delivering residential, commercial, and civic projects in the Bay Area. Directly comparable in scale, geography, and the same residential/commercial/public mix Kastrop serves.
- Leddy Maytum Stacy Architects: San Francisco architecture firm with a long-standing practice in residential, commercial, and public/institutional work across the Bay Area. Comparable multi-vertical approach and Peninsula presence.
- PYATOK architecture + urban design: Oakland-based architecture and urban design firm working across residential, public, and community-oriented projects in the Bay Area. Overlap with Kastrop's residential and public segments.
- BCV Architects: Bay Area architecture firm specializing in residential, hospitality, and commercial projects. Comparable in scale, regional footprint, and client mix to Kastrop's Peninsula practice.
- TLCD Architecture: Peninsula/North Bay architecture firm with a multi-disciplinary practice in commercial, residential, education, and civic projects. Comparable regional presence and vertical mix.
Emerging players
- Abodu: Prefab ADU manufacturer serving California homeowners with a turnkey design-build model. Competes for the same ADU project demand that is a growing part of Kastrop's pipeline, though with a fundamentally different delivery model.
- Cover (Cover Technologies): Tech-enabled prefab ADU company offering standardized backyard homes in California. Targets the same ADU demand wave Kastrop serves, with a software-driven, fixed-price alternative to custom architecture.
Broad incumbents
- HOK: Global design, architecture, and engineering firm with West Coast presence across commercial, healthcare, and institutional work. Comparable capability set to Kastrop's commercial and public practice, at materially larger scale.
- Gensler: Global architecture and design firm with a significant San Francisco office serving commercial, workplace, and public clients. Represents the larger-incumbent end of the same Bay Area architecture market.
Market position
Strengths1 record
Weaknesses5 records
Competitive moat3 records
Key risks5 records
Key highlights6 records
Customer concentration
The Kastrop Group social profiles
Digital presenceThe Kastrop Group financial estimates
Financial estimateRevenue estimate
Valuation estimate
The Kastrop Group leadership team
Management profileNumber of profiles
Profiles2 records
The Kastrop Group funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
The Kastrop Group M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about The Kastrop Group
What does The Kastrop Group do?
The Kastrop Group is a full-service architecture firm that designs buildings and prepares construction documents for residential, commercial, and public projects in the San Francisco Bay Area. Services span from existing conditions assessment and preliminary design through design development, construction documents, and construction administration, with specialization in green/sustainable design, energy-efficient solutions, and Accessory Dwelling Units (ADUs). The firm is led by a licensed Principal Architect and operates from Redwood City, California, with 37+ years of practice.
Is The Kastrop Group a public or private company?
The Kastrop Group is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was The Kastrop Group founded?
The Kastrop Group was founded in 1987. It employs 1 to 10 people.
Where is The Kastrop Group based?
The Kastrop Group is headquartered in Redwood City, United States, in the North America region.
How does The Kastrop Group make money?
One revenue line is on record: architectural Design Services.
Who are The Kastrop Group's main competitors?
Direct peers on record are EHDD, Studio VARA, Leddy Maytum Stacy Architects, PYATOK architecture + urban design, BCV Architects and TLCD Architecture. Emerging players are Abodu and Cover (Cover Technologies). Broad incumbents are HOK and Gensler.
Does The Kastrop Group have an API?
No public API is recorded for The Kastrop Group.