Natural slate and clay tile win for NJ historic homes — slate lasts 60-150 years and clay tile 100+ per the InterNACHI chart, both matched in kind under Standard 6 of the Secretary of the Interior's Standards per the National Park Service; synthetic slate is the budget alternate where a local commission allows it.
The deciding factor is not price alone but in-kind authenticity — the right material for a historic home matches the era's original roof, and the figures below show which option wins for each home and budget.
Which Historic Roofing Material Matches Each NJ Home's Period Style and the Secretary of the Interior's Standards?
Natural slate, clay tile, cedar shingle, and copper each match a distinct NJ period style under Standard 6, which directs that a distinctive historic roof be replaced in kind per the National Park Service. The deciding factor is the home's architectural era.
Natural slate suits Victorian, Colonial Revival, and Gilded Age homes, clay tile suits Spanish Revival and Mission-style homes, cedar shingle suits Craftsman, bungalow, and early Colonial homes, and copper suits Federal, Greek Revival, and farmhouse styles, per NPS Preservation Brief 4. Brief 4 also names the historic metals — tin plate, terne plate, copper, lead, and zinc — and directs that the historic fabric, including roof coursing and color variation, be photographed, measured, and recorded before work begins for future reference. Natural slate is repaired rather than replaced whenever possible per NPS Preservation Brief 29, with the roof replaced only when 20% or more of the slates are broken, missing, or sliding.
Synthetic slate and architectural asphalt substitute only on non-character-defining roofs — primarily flat or non-visible sections, or non-contributing structures — per NPS Preservation Brief 4, since asphalt is not a like-for-like swap for a visible historic roof. On a designated Essex County house, natural slate fits a pre-1920 Montclair or Newark home and cedar fits a Craftsman, matched in kind per the NPS Preservation Briefs.
How Much Does Each Historic Roofing Material Cost and How Long Does It Last in New Jersey?
Lifespan decides the long-term value: natural slate lasts 60-150 years (premium 100+ per the National Slate Association), clay tile 100+, and copper 70+ per the InterNACHI life-expectancy chart, with copper over 100 years properly installed per the Copper Development Association.
Cedar lasts 20-40 years as shake and 30-50 years as shingle per the Cedar Shake & Shingle Bureau, while architectural asphalt lasts 25-35 years per GAF and installs at $6.50-$11.00 per square foot in NJ per Josten Roofing — the lower-cost path on a non-contributing or non-visible roof where Brief 4 permits a substitute material that still matches the historic roof's scale, texture, and coloration as closely as possible. Synthetic slate spans 10-35 years as simulated slate per the InterNACHI chart, with composite lines designed to 40-50 years per CertainTeed, supplying the slate profile at lighter weight.
Natural slate and clay tile win on cost-to-own because their century-plus service life amortizes the upfront figure across generations of ownership, while synthetic slate wins where budget prohibits natural stone and the local commission accepts it — though some Historic Preservation Commissions require natural stone, per the NPS Standards. The deciding factor is whether the roof is character-defining: a visible historic roof favors the in-kind material, while a flat or non-visible section opens the lower-cost alternates. Architectural asphalt enters the comparison only on a non-contributing structure, since it is not a like-for-like swap for a visible historic slate, tile, cedar, or copper roof, per NPS Preservation Brief 4.
What Does a NJ Homeowner Have to Clear Before Reroofing a Historic Home — Certificate of Appropriateness, Building Permit, or Neither?
A Certificate of Appropriateness — not National Register or NJ Register listing — is the binding gate on a private NJ reroof, required for a designated landmark or a property in a LOCAL historic district per N.J.S.A. 40:55D-107. Listing alone places no restriction on a private owner using private funds, per both the NPS and the NJ DEP Historic Preservation Office.
A Certificate of Appropriateness does not replace a building permit; a reroof in a local district commonly clears both. The NJ Uniform Construction Code treats a full re-roof of a detached 1- or 2-family dwelling as ordinary maintenance with no construction permit per N.J.A.C. 5:23-2.7, so a designated home in a regulated district faces the COA review even when the covering swap itself triggers no permit.
Essex County local-district controls apply where an ordinance designates the area: Glen Ridge regulates a district covering over 90% of the Borough under Borough Code Ch. 15.32, Montclair under Code §347-136, and Newark's Landmarks and Historic Preservation Commission auto-designated Register-listed districts as of May 30, 2007. In a designated local district, the COA review measures the proposed roof against the adopted design guidelines and the Secretary of the Interior's Standards.
A Certificate of Appropriateness is the homeowner's checklist item that turns the material choice into an approved plan, so the in-kind slate, clay tile, cedar, or copper selected in the prior sections clears review more readily than a substitute. A homeowner confirms designation, clears any required COA, and matches the material in kind before a roof replacement on a historic home.
Natural slate and clay tile rank highest for NJ historic homes on in-kind authenticity and century-plus durability per the InterNACHI chart, with cedar shingle and copper matching specific period styles and synthetic slate the budget alternate where a commission allows it. The deciding factor is the home's era and whether the roof is character-defining, cleared against any local Certificate of Appropriateness under N.J.S.A. 40:55D-107.