Intertek-ATI plan approval evidence
Difficulty: highR-22345 and R-22348 show Intertek-ATI California Factory-Built Housing plan approval references, approval dates, expiration dates, and the factory-only scope boundary.
Read pageCertificates and approval proof
Certificate pages for the ADU product, built from the actual packet.
This hub explains the certificates, approvals, standards, and inspection evidence that matter before a buyer trusts a modular ADU quote. The goal is not to paste logos onto a sales page. The goal is to show what evidence exists, what still has to be verified, how hard each item is to obtain, and why a documented product path is different from a generic prefab pitch.
Trust stack
These are not the same thing, and that is exactly why the site needs these pages.
A modular ADU buyer can hear words like approved, certified, inspected, permitted, engineered, compliant, and listed as if they all mean the same thing. They do not. A California Factory-Built Housing plan approval supports the state factory-built structure lane. An HCD insignia relates to prior plan approval and a quality-assurance path before shipment. A city permit belongs to the specific property. Finish-material certifications may apply to flooring or wall-panel product families. Energy documentation, UL listings, ASTM tests, NFPA requirements, and NSF references are component or code-submittal evidence.
That is why ADU Cost should not be a badge wall. It should be a proof map. If a claim is in the supplied packet, it gets shown as packet evidence. If it is an official California requirement, it gets explained with source links. If it is a material-catalog claim, the page tells the buyer to request the current certificate for the selected SKU. If it is only a standard requirement in the drawings, the page calls it a submittal requirement, not a completed certification.
Plan approvals shownR-22345 and R-22348Intertek-ATI packets dated 2026-07-15.
State boundaryFactory-built structure onlyFoundation and site work remain local.
Finish documentsKingdom catalogsFlooring and wall-panel certificate claims need SKU-current proof.
Buyer promiseNo fake final approvalEvidence before hype.
HCD FBH insignia path
Difficulty: highHCD says Factory-Built Housing insignia are issued through an HCD-approved Quality Assurance Agency for units that have prior plan approval.
Read pageFinish-material certificates
Difficulty: medium to highThe Kingdom flooring and wall-panel catalogs list CE, UKCA, EPD, FloorScore, Indoor Air Comfort Gold, TUV Profi Cert, and Blue Angel related claims. Buyers should request SKU-current certificates before purchase.
Read pageTitle 24 energy documentation
Difficulty: medium to highThe packets include California code and energy-code references. This is not a stand-alone certificate; it is part of the documentation needed for review.
Read pageUL, ASTM, NFPA, NSF submittals
Difficulty: medium to highThe technical notes call for third-party labeled systems and recognized standards. The buyer should treat these as procurement and inspection submittals, not vague marketing language.
Read pageWhy certificates matter
Difficulty: depends on scopeA serious ADU packet separates state approval, local permits, finish certificates, energy forms, component listings, contractor licensing, and final inspection proof.
Read pagePDF certificate articles
Individual material-certificate pages from the flooring and wall-panel catalogs.
These pages are built from the rendered Kingdom flooring and wall-panel certificate tables. Each page explains the mark or test result, how hard it is to obtain, what the buyer should verify, and the exact truth boundary before ADU Cost uses it in a quote.
FloorScore IAQ flooring
Difficulty: Medium to highThe Kingdom flooring PDF lists FloorScore in the certificate rows alongside CE, UKCA, EPD, Indoor Air Comfort Gold, and TUV Profi Cert for the LVT/EPC technical tables.
Read pageIndoor Air Comfort Gold
Difficulty: HighBoth the Kingdom flooring and wall-panel PDFs list Indoor Air Comfort Gold in their certificate sections. The wall-panel table also lists VOC emissions under ISO 16000 parts -3, -6, -9, and -11 with an A+ result.
Read pageEPD environmental declaration
Difficulty: HighThe flooring and wall-panel PDFs both list EPD in the certificate rows, placing it beside market-access and indoor-air claims rather than in a separate project approval packet.
Read pageBlue Angel flooring
Difficulty: HighThe Kingdom flooring page 42 certificate table lists Blue Angel for the PET product family. The LVT/EPC page uses a different certificate mix, which is why SKU matching matters.
Read pageCE and UKCA marking
Difficulty: Medium to highThe Kingdom flooring and wall-panel PDFs list CE and UKCA in their certificate rows. Those rows are useful material documentation facts, but they do not approve a California installation by themselves.
Read pageTUV PROFiCERT Interior
Difficulty: HighThe Kingdom flooring PDF includes TUV Profi Cert in the certificate table for the LVT/EPC product families. It is listed as a finish-material claim, not as a California state approval.
Read pageVOC and E1 formaldehyde
Difficulty: Medium to highThe flooring PDF lists formaldehyde emission EN 717-1 E1 and VOC emissions with ISO 16000 parts -3, -6, -9, and -11 A+. The wall-panel PDF lists the same formaldehyde and VOC evidence rows.
Read pageFire, slip, wear, and sound tests
Difficulty: Medium to highThe flooring PDF lists reaction to fire EN 13501-1, slip resistance DIN 51130 or EN 13893, wear resistance EN 660-2, sound insulation ASTM E90/E413 STC 68 and ASTM E989/E492 IIC 73 for listed material systems. The wall-panel PDF lists reaction to fire EN 13501-1, slip, wear, scratch, impact, castor-chair, staining, light stability, antistatic, thermal, dimensional stability, residual indentation, sound insulation, and VOC rows.
Read pageWhy we are different
Most prefab pages sell the picture. This site sells the due-diligence path.
The product photos matter because buyers need to see the actual unit. But the stronger differentiator is what sits behind the photos: the approval packets, the plan snapshots, the explicit factory/site boundary, the finish catalogs, the calculator, and the honest list of what still needs local review. That is a better trust story than a generic claim that an ADU is fast, affordable, or permit-ready.
A buyer should leave this section understanding what to ask next: Which model path are we using? Which plan approval packet applies? Will the delivered unit have the required state evidence? What material SKU is being selected? Are the finish certificates current? Which local permit lane applies to my city? Which contractor license will be used for the scope? What evidence will be delivered at closeout?