What Pacific Interwest does

Pacific InterWest is a California-based construction inspection and consulting firm founded in 2005 by David E. MacLellan, now operating as a subsidiary of Atlantic & Pacific Build Group. The company delivers third-party QA/QC inspection, architectural peer review, and consulting services across the full project lifecycle — pre-construction design, construction monitoring, and post-construction maintenance — to builders, developers, apartment owners, condo/HOA owners, and insurance carriers. Operations are organized through four wholly-owned subsidiaries: PIWBCI (third-party construction inspections and architectural peer reviews), PIWECI (HERS testing, Title 24 modeling, and 45L energy tax credit processing), PIWAIS (turnkey SB721/SB326 exterior elevated element compliance inspections), and DEM Site Evaluation (surrounding property surveys and HOA turnover inspections).

The firm employs ICC-certified building inspectors and CHEERS/RESNET-certified HERS raters (minimum six years' experience), and uses its proprietary PIW QTECH® online inspection software to record individual element inspection findings and produce SB721/SB326 compliant reports. PIW QTECH® is positioned as a documentation and configurability differentiator in an otherwise labor-intensive field-services business. Geographic coverage spans five western U.S. states — California, Nevada, Washington, Arizona, and Oregon — with corporate headquarters in Walnut Creek, California.

Revenue is generated through professional services billed at hourly rates or as fixed-fee engagements; pricing is primarily quote-based and not publicly disclosed. Customer segments are diversified across residential and commercial builders/developers, apartment owners (SB721, 6-year re-inspection cycle), condo/HOA owners (SB326, 9-year re-inspection cycle), and builders requiring Title 24 energy compliance. Customer acquisition is driven by long-standing industry relationships, a website serving as the primary digital presence, organic social channels (LinkedIn, Facebook, Instagram), and referrals through memberships in industry associations including the California Building Industry Association, National Association of Home Builders, California Homebuilding Foundation, and HomeAid Northern California.

Name

Pacific Interwest

Legal name

Pacific InterWest Building Consultants, Inc.

Website

https://pacificinterwest.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

1–10 employees

Short description

Pacific InterWest is a California-based construction inspection and consulting firm providing third-party QA/QC, architectural peer review, HERS testing, and SB721/SB326 compliance services to builders, developers, and property owners across five western U.S. states.

Ownership category

akta.pro rank

Headquarters

HQ city

Walnut Creek

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Others

Revenue model

1. Professional Services (Inspection & Consulting): The company generates revenue through professional services including construction inspections, architectural peer reviews, waterproofing consultations, HERS testing, SB721/SB326 compliance inspections, and course-of-construction monitoring. Services are billed at hourly rates or as fixed-fee engagements.
2. HERS Testing Services: Home Energy Rating System (HERS) testing services for residential and commercial buildings to verify energy efficiency compliance. Raters certified by CHEERS in California and RESNET outside California provide testing services including Quality Insulation Installation, duct leakage testing, blower door tests, and refrigerant charge verification.
3. California Title 24 Modeling: Energy calculations and modeling services to determine building energy efficiency compliance with California Building Energy Efficiency Standards. Provides Title 24 reports to validate designs as compliant.
4. 45L Energy Tax Credit Processing: Processing of federal energy tax credits ($2,000 per dwelling unit for energy-efficient homes). The company reviews energy features and processes paperwork for builders to obtain certificates.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels5 records

Core offering

Pacific InterWest delivers third-party construction inspection and consulting services for builders, developers, property owners, and HOAs across the U.S. West Coast. Its offering spans pre-construction (waterproofing design, architectural peer reviews, property assessments), construction (course-of-construction inspections, mockup water testing, draw processing), post-construction (HOA turnover inspections, maintenance manuals), HERS / Title 24 energy compliance, and turnkey SB721 and SB326 exterior elevated element inspections. Inspections and documentation are produced using the proprietary PIW QTECH software, and the company is licensed as a California building contractor (license #875684).

Product overview

Pacific Interwest is a construction inspection and consulting firm offering a comprehensive suite of services through three operating subsidiaries: Pacific InterWest Building Consultants (PIWBCI) for third-party construction inspections and peer reviews; Pacific InterWest Energy Consultants (PIWECI) for HERS testing and Title 24 compliance; and Pacific InterWest Apartment Inspection Services (PIWAIS) for SB721/SB326 compliance inspections. Services span pre-construction (waterproofing design, architectural peer reviews, property assessments), construction (draw processing, mockup testing, course of construction inspections), and post-construction (maintenance manuals, HOA inspections, surveys) phases. The company also offers specialized HERS & Energy services and SB721/SB326 compliance inspections. The company uses proprietary PIW QTECH inspection software for recording and reporting inspection findings.

Differentiator

Problem solved

Functional benefit

Products and services

• Pacific InterWest Building Consultants, Inc. (PIWBCI) Third-party construction inspection, architectural peer review, and risk-management services for builders, building owners, and their insurance carriers, implementing on-site programs of Best Construction Practices across California, Nevada, Washington, Arizona, and Oregon.
• Pacific InterWest Energy Consultants, Inc. (PIWECI) HERS testing, California Title 24 energy modeling, and federal 45L energy tax credit processing services for builders to comply with California's energy code requirements, staffed by CHEERS-certified HERS raters in California and RESNET-certified raters outside California.
• Pacific InterWest Apartment Inspection Services (PIWAIS) Turnkey SB721 and SB326 exterior elevated element inspection, repair design, permitting, and construction management services for apartment owners (six-year cycle) and condo / HOA owners (nine-year cycle), with element-level documentation produced in the proprietary PIW QTECH software.
• DEM Site Evaluation and Inspection Company (DEM) Pre-construction and post-construction site evaluation services for builders, including surrounding property surveys, homeowner association turnover inspections, maintenance manuals, and periodic HOA maintenance surveys.
• Pre-Construction Services Pre-construction consulting for builders and developers covering Waterproofing Design Consultation, Architectural Peer Plan Reviews, Surrounding Properties Surveys, and Property Condition Assessments, delivered from initial design through construction documents.
• Construction Services Construction-phase services including Construction Draw Processing / Investor Reports, Exterior Wall Assembly Mockup Review and Water Testing, Course of Construction Inspections, and Custom Services for in-progress quality assurance and risk mitigation.
• Post-Construction Services Post-construction services including Common Area Completion Inspections, Facilities Maintenance Manuals and Surveys, HOA Common Area Turnover Inspections, HOA Maintenance Manuals, Annual HOA Maintenance Surveys, and Homeowner Maintenance Manuals.
• HERS & Energy Services Energy compliance services bundling California Title 24 modeling, HERS testing, and 45L Energy Tax Credits processing to help builders meet California's energy code requirements and capture federal tax credits.
• SB 721 & SB 326 Compliance Services Compliance inspection program for California Senate Bills 721 and 326 covering exterior elevated element inspections, repair design, repair inspections, and annual inspections for apartment and condo owners.
• PIW QTECH Inspection Software Proprietary online inspection software used by Pacific InterWest inspectors to record element-level inspection findings and produce SB721/SB326 compliant reports.

Segments4 records

Ideal customer profiles8 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Ten partnerships are on record, tiered core and minor.

• Pacific InterWest Building Consultants, Inc. (PIWBCI)coreOthers · 1 January 2020PIWBCI engages in risk management through architectural peer reviews and third-party construction inspections. Works with builders and building owners, and their insurance carriers to implement Best Construction Practices. Licensed as a building contractor in California.
• Pacific InterWest Energy Consultants, Inc. (PIWECI)coreOthers · 1 January 2020PIWECI provides builders with services necessary to comply with California's energy code requirements. HERS raters certified by CHEERS with minimum six years experience. Offers full menu of HERS testing services, California Title 24 modeling, and 45L energy tax credit processing.
• Pacific InterWest Apartment Inspection Services (PIWAIS)coreOthers · 1 January 2020PIWAIS provides turnkey inspection and consulting services for apartment and condo owners to comply with SB721 and SB326 requirements. Founded in 2020 specifically for this purpose, drawing on extensive experience of architects, inspectors, and consultants within Pacific InterWest.
• Atlantic & Pacific Build GroupcoreOthersAtlantic & Pacific Build Group (APBG) was formed in 2020 as the operating company for Pacific InterWest companies (PIWBCI, PIWAIS, PIWECI, and DEM), Pacific States Aerial, MacLellan Media Inc., and Homeowners Education Association. APBG serves all sectors of the building industry from land acquisition through homeowner education and marketing.
• DEM Site Evaluation and Inspection CompanycoreOthersDEM performs pre-construction and post-construction services for builders including surrounding property surveys, homeowner association turnover inspections, maintenance manuals, and periodic HOA maintenance surveys.
• Homeowners Education AssociationminorOthersHomeowners Education Association distributes homebuilding industry publications to property developers and homeowners. Publications focus on homebuilding quality control, SB800 construction compliance, and industry standards of care.
• HomeAid Northern CaliforniaminorOthersHomeAid is a leading national non-profit provider of housing and resources for people experiencing homelessness, founded in 1989. Has expanded to 19 chapters in 13 states and provided housing for over 330,000 individuals. PIW has a partnership connection with the Northern California chapter.
• California Building Industry Association (CBIA)minorOthersCBIA was established in 1943 and plays a significant role in California's economic strength. Focused on supporting policies that bolster the construction industry. PIW's leadership has historical ties through the California Building Industry Association Codes and Energy Committee.
• California Homebuilding Foundation (CHF)minorOthersCHF supports and celebrates homebuilding professionals through funding research studies, scholarships, and educational programs. Operates under the principle that better education benefits communities, trades, and students.
• National Association of Home Builders (NAHB)minorOthersNAHB protects the American Dream of housing opportunities while working to achieve success for its members. Constructs about 80 percent of new homes built in the United States annually. Founded in early 1940s with over 700 state and local associations.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• EBI Consulting: National building inspection, environmental due diligence, and engineering firm serving commercial real estate and multifamily owners — overlapping with PIW's course-of-construction, property condition assessment, and compliance work.
• 4LEAF, Inc. California-focused construction management, inspection, and code consulting firm serving public and private developers. Comparable to PIWBCI's course-of-construction inspection and peer review work in California.
• Partner Engineering and Science, Inc. National engineering and inspection firm offering property condition assessments, construction risk management, and code consulting — directly comparable to PIWBCI's third-party construction inspections and architectural peer reviews.
• Simpson Gumpertz & Heger (SGH): Engineering firm specializing in building envelopes, structural investigation, and waterproofing consulting — directly comparable to PIW's waterproofing design consultation, exterior wall mockup water testing, and EEE inspection/repair design services.
• Alpha Structural, Inc. California-based structural engineering and building inspection firm specializing in SB721/SB326 balcony inspections, soft-story retrofits, and property condition assessments. Closely comparable to PIW's PIWAIS offering and overall California inspection focus.

Broad incumbents

• Bureau Veritas: Global testing, inspection, and certification (TIC) firm with a building and infrastructure compliance practice. Comparable in function (third-party construction and compliance inspections) but operates as a broad portfolio incumbent across many industries.
• Intertek: Global TIC company offering building and construction services including code compliance, energy efficiency (HERS-adjacent testing), and quality assurance — overlapping with PIWECI's HERS/Title 24 work and PIWBCI's QA/QC inspections.
• ECS Group of Companies: National provider of construction materials testing, geotechnical engineering, and building code consulting — comparable to PIWBCI's construction inspection and peer review services, with broader geographic and service reach.
• Rimkus Consulting Group: Engineering and technical consulting firm providing building envelope, structural, and construction defect consulting — comparable to PIW's waterproofing design, EEE repair design, and architectural peer review capabilities.
• Terracon Consultants, Inc. Large national engineering firm offering geotechnical, environmental, and construction materials engineering/testing. Overlaps with PIW's construction inspection and property condition assessment services but at significantly greater scale and geographic breadth.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/PacificInterWest
• LinkedInlinkedin.com/company/pacific-interwest-building-consultants/about
• Instagraminstagram.com/pacificinterwest
• Xx.com/PacificInterWe1

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries3 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 Pacific Interwest