Why historic districts have siding rules
Siding is one of the most visible parts of a house. In a historic district, the width of the boards, the texture, the corner boards and the trim around windows are part of what makes the street look the way it does. Local historic district ordinances therefore require review of exterior changes – often anything visible from a public street – before a permit is issued. National Register listing alone usually does not restrict private homeowners; local designation by a city or county is what triggers review.
How review works in practice
The names differ, but the process is similar almost everywhere:
- Lancaster and York, Pennsylvania: a Historical Architectural Review Board (HARB) reviews exterior work, and a certificate of appropriateness is required. York’s application asks for photos of the existing condition and the brand and model of the proposed material.
- Cincinnati: exterior changes in local historic districts need a certificate of appropriateness from the Historic Conservation Board, which can approve, approve with conditions or deny.
- Cleveland: siding projects go through the Landmarks Commission office as part of the city’s permit review.
- Baltimore: properties in local districts are reviewed by the Commission for Historical and Architectural Preservation (CHAP).
- Philadelphia: historic properties need Philadelphia Historical Commission approval before the city’s EZ exterior wall permit can be used.
Many smaller boroughs, townships and counties have their own boards. Minor repairs in kind are sometimes approved by staff; larger changes go to a public meeting.
What boards usually look for
Most local guidelines are based on the Secretary of the Interior’s standards and the National Park Service’s preservation briefs. The general principle is simple: repair first, replace in kind second, substitute last. The National Park Service’s Preservation Brief 8 says that aluminum or vinyl siding may be acceptable on a historic frame building only when:
- the existing siding is so deteriorated that it cannot be repaired;
- the substitute can be installed without irreversibly damaging or hiding architectural features and trim; and
- the substitute matches the historic material in size, profile and finish, so the character of the building does not change.
The same brief notes that vinyl adds very little insulation on its own – energy savings alone rarely justify covering historic wood.
Vinyl, fiber cement or wood?
- Wood in the original profile is always the safest choice for approval on a historic facade. It needs paint and maintenance.
- Fiber cement is widely accepted as a substitute on secondary and sometimes primary walls, because it can match lap width and takes paint like wood. Smooth finishes are usually preferred over exaggerated wood-grain textures.
- Vinyl and aluminum are the hardest to get approved on street-facing walls. York’s HARB, for example, generally does not approve vinyl on primary elevations, and Baltimore’s CHAP staff have called for painted wood trim where synthetic siding is used. Rear walls with limited visibility are more often allowed.
Details that often decide approval
- Exposure (the visible width of each board) matching the original
- Corner boards, window casings and cornices kept or replicated, not wrapped in aluminum
- No J-channel around windows where original trim exists
- Texture close to painted wood (smooth rather than heavy wood grain)
- Paint colors appropriate to the style and era – some districts review color, many do not
- Reversibility – installation that does not destroy original material underneath
Preparing an application
- Check the designation. Look up your address on the city or county historic preservation map, or call the preservation office.
- Talk to staff early. A short pre-application call often tells you what the board will and will not accept.
- Document the house. Photos of every elevation, close-ups of damage, and any evidence of the original siding under later layers.
- Get product data. Manufacturer, product line, exposure, texture and trim details; your contractor can supply spec sheets.
- Explain the need. Show why repair is not practical, if you are proposing replacement.
- Allow time. Many boards meet monthly; build the review into your schedule before you order materials.
Repairing original siding instead
Preservation guidance always starts with repair, and repair is often cheaper than people expect. Individual rotted clapboards can be replaced with matching new boards; splits can be glued and filled; failed paint can be scraped (lead-safe) and repainted. A carpenter experienced with old houses can tell you how much of the original siding is sound. Where only one wall is badly weathered – usually the south or west side – replacing boards on that wall and repairing the rest may be the approach a board approves fastest.
Costs to expect
Replacement in kind with wood or fiber cement in a matching profile usually costs more than standard vinyl, and custom trim adds more. National cost guides put fiber cement at roughly $5 to $14 per square foot installed and engineered wood at $4 to $13, versus $3 to $12 for vinyl. Budget for the time of the review as well – a delayed start can matter more than the price difference.
Other rules that still apply
Historic review is in addition to, not instead of, the normal building permit, contractor licensing or registration, and lead-safe rules. Historic homes are almost always older than 1978, so a contractor who disturbs more than 20 square feet of painted exterior must be an EPA-certified firm using lead-safe work practices. Older homes may also have asbestos-cement shingles under later siding.
Working with your contractor
Choose a contractor who has worked in historic districts before and knows the board’s expectations. They can prepare drawings or product sheets, attend the hearing if needed, and plan the job so that original trim and features are protected during removal. Put the approval conditions into the contract, so the details the board approved are exactly what gets installed – changes on site can mean a second review.
Energy upgrades in historic homes
Homeowners often want new siding to make an old house warmer. Preservation guidance points out that siding itself adds little insulation, and that the biggest gains in old houses usually come from air sealing, attic insulation and storm windows – changes that do not alter the exterior. If you want exterior insulation, ask the board early; it thickens the wall and changes trim details, which boards review closely.
What if work was done without approval?
Boards can require unapproved work to be changed or removed, and it can complicate a sale. If you bought a home with unapproved siding, or started work without knowing the rules, contact the preservation office; many will work with owners on a path to compliance.
Sources
- National Park Service Preservation Brief 8 on aluminum and vinyl siding, as summarized in Prince George’s County preservation guidance
- City of Lancaster code: Historic district ordinance (HARB)
- City of York: HARB application for a certificate of appropriateness
- City of York: HARB meeting minutes, April 2026
- City of Cincinnati: Historic conservation – local historic designation
- City of Cleveland Landmarks Commission: Residential siding guide
- Baltimore City CHAP: Commission for Historical and Architectural Preservation
- City of Philadelphia L&I: EZ Exterior Walls permit
- Prince George’s County Planning: Historic preservation guidance on synthetic materials
- U.S. EPA: Renovation, Repair and Painting Program for contractors