Who established what, and when
Most of this argument is not new, and the parts that are, are narrower than this site used to imply. Established researchers own the financing half outright. They have owned it for six years.
This page exists because the largest risk to a project graded like this one is not a wrong number. It is a true number presented as a discovery. In August 2026 an audit of the existing literature found that several claims this site treated as open have been published work for years, and that the one gap the project most expected to find is not a gap at all. Everything below carries a register row, the same as every other claim here.
The Pew Charitable Trusts · Housing Policy Initiative · since 2020
Established elsewhere
Pew has worked since 2020 on small mortgages under $150,000, on personal-property lending for manufactured homes, and on alternative financing arrangements, extending to housing shortage and land use in 2023. Its 2024 report with Harvard's Joint Center for Housing Studies, Overcoming Barriers to Manufactured Housing: Promising Approaches from Five Case Studies, finds a new manufactured home can save a buyer $50,000 to more than $100,000 against a comparable site-built house.
This site's account of the chattel-lending failure — that a cheap product was built and then made unfinanceable — is Pew's published agenda, stated first and stated better. Register row E-103.
Lincoln Institute of Land Policy · Pew Charitable Trusts · 2025
A gap in the literature, not in this project
The case for repealing the permanent chassis rests on a statistic: that manufactured homes are almost never moved after they are placed, so the transportability the chassis exists to serve is mostly fictional. It is a good argument and this site would like to make it. The statistic cannot be sourced.
The Lincoln Institute states it twice on one page, with no footnote, no hyperlink and no named study — and in two incompatible forms in adjacent sentences: “fewer than 5–7 percent of all manufactured homes are ever moved after initial placement” and “roughly 95 percent of homes are never moved after their initial installation”. Pew repeats the figure. Following the chain finds nobody citing anybody.
A number that cannot hold its own value across a single clause has no measurement behind it. This is recorded rather than repeated, and the claim does not appear on this site: register row E-121 for the finding, E-093 for the gap it leaves. The argument here is made structurally instead — a home titled as a vehicle is taxed, financed and depreciated as one whether or not it ever moves, which needs no figure at all.
What would close it: the Census Manufactured Housing Survey contacts dealers about placement, and the American Housing Survey records whether a unit has moved. Either could support a real estimate. Nobody appears to have asked.
Emily Hamilton · Mercatus Center · congressional and state testimony
Established elsewhere
Hamilton has testified that manufactured housing built to the HUD code is the least expensive way to build a new home in the United States, and that the median manufactured-home buyer earns about $57,000 against about $93,000 for site-built. Her work on state accessory-dwelling law and zoning preemption covers the same statutory ground this project reads as its opening. Register row E-104, graded Supported: testimony is a primary document for what was said and a secondary one for the underlying series, and that series is owed.
Lincoln Institute of Land Policy · I'm HOME network · convened since 2022
Established elsewhere
The Innovations in Manufactured and Modular Homes network, founded in 2005 and convened by the Lincoln Institute since March 2022, works on home quality, land tenure and security, financing, and land use and zoning. Those are the four layers this project separates and presents as its own decomposition. Register row E-105.
National Zoning Atlas · methodology published 2024
Established elsewhere
The Atlas codes upwards of 200 regulatory characteristics per district under a published methodology, How To Make a Zoning Atlas 2.0, and the permissions it captures include accessory dwelling units, planned residential developments and mobile homes. It has identified 33,295 jurisdictions and logged 102,000 districts. Register row E-106.
This is the finding that cost this project the most. The audit was written expecting to report that manufactured housing was an absent characteristic, and that its absence was the specific hole worth filling. It is not absent. It is coded, at national scale, by a project with a standardised published method and automation pilots already running.
Brian Potter · Construction Physics
Established elsewhere
Potter's position is that prefabricated construction typically costs no less than conventional building, and that US construction productivity has risen roughly 10% since 1945 while manufacturing productivity rose 8.6×. It is now the ninth objection on this site and it is conceded, not answered. Register row E-102.
A claim of novelty has to survive the same grading as a claim of fact. Three of the four below are questions rather than findings, and the fourth is a method note. That is the whole honest inventory.
| The claim | Status | Where it sits |
|---|---|---|
| Whether a home someone can actually order clears every dimensional, materials and geometric standard on a specific parcel — not whether a district permits mobile homes, which is already coded. | Open | E-107, and the narrowed target of Gate 0. The distinction from the Atlas is the whole claim: permission recorded is not placement tested. |
| What share of binding land-use provisions are objective rather than discretionary, measured rather than asserted. | Open | E-039, never measured anywhere. Corroborated qualitatively across eight countries in E-083, which finds automated checking reaches mainly quantifiable provisions and names human-judgement requirements as the key barrier. |
| A like-for-like price per square foot, factory against site-built, at matched finish and region with land excluded on both sides. | Open | E-098. Until it exists, the Potter objection stands and the affordability claim on this site rests on a comparison nobody here can complete. |
| Whether a jurisdiction will accept an insured, compiled determination in place of first-pass review, and whether a carrier will write the policy behind it. | Open | Named on the road, unproven, and now deferred rather than led with — see below. |
This site borrowed type certification from aviation and abbreviated approval from pharmaceuticals, on the premise that housing had no such precedent. It does. A Design Approval Primary Inspection Agency has evaluated manufactured-home designs and quality-control programs against the federal standard since 1976 under 24 CFR 3282.361, and Florida has permitted a licensed, insured private provider's plan review to substitute for the building department's since 2002 — with automated, software-based single-trade review added by statute in 2025 (Fla. Stat. §553.791(6)). Register rows E-088 and E-089.
The layer is not novel and it is not wrong. It answers a question that the buyer this project is now looking at does not ask, because the product that buyer would place is already type-certified. It stays on the road and comes off the front of the argument.
Two NAHB instruments appear on this site and they point in opposite directions.
| Instrument | What it says | How it is used here |
|---|---|---|
| E-001 — Government Regulation in the Price of a New Home, NAHB's advocacy blueprint. Two self-report surveys of NAHB's own members: 54 of 2,125 land developers responding, plus 337 builders. | Regulation accounts for $131,734, or 26.4%, of the price of a new single-family home. | Graded Contested as of August 2026, downgraded from Supported. It is published by the party it benefits and its own member survey does not corroborate it. It is cited as the industry's stated position on regulatory cost, never as a measurement of it. |
| E-099 — NAHB's annual member survey of what was actually a serious problem. | Cost and availability of developed lots, 63%. Labor, 61%. High interest rates, 84%. Approval or plan-review duration does not appear anywhere in the top ten. | Graded Confirmed and cited as the strongest available evidence against this project's own diagnosis. If duration were the binding constraint, builders asked directly would say so, and they do not. |
Which is used for what, and why. The advocacy figure is used only where the argument is about what the industry claims and campaigns on. The member survey is used wherever the question is what actually constrains building — including against this site's own thesis. When they conflict, the survey wins, because a question put to members about their own year is a weaker instrument than a measurement but a stronger one than a number produced for a campaign. Neither is treated as settled, which is what Contested means.
What this page does not claim. That the reading above is complete. It covers five bodies of work identified in one audit, in August 2026, and there will be others — particularly in the land-use and appraisal literatures, which were not swept. Corrections to this page are welcome and will be logged like any other: the corrections log.