Historic Home Insurance in Portsmouth, NH

By Jon Merwin, Founder and CEO

Historic Homes · Older Homes · Ordinance or Law · Portsmouth, NH

Portsmouth has some of the oldest housing in New Hampshire. Federal and Georgian homes near the waterfront, nineteenth-century houses in the South End and the West End, and converted homes around Market Square give the city its character. They also raise questions that a newer house never does: what it would really take to rebuild them, which codes apply, and whether the City has a say in how the outside is restored.

Portsmouth Atlantic Insurance is a family-owned independent agency founded in 2005, with our office in Portsmouth, NH. We are New Hampshire’s highest-rated agency on Google, with 1,000+ Google reviews and over 2,000 testimonials, and we are licensed in 10 states. We compare 40+ carriers and charge no fees. For coverage on any Portsmouth home, see our page on homeowners insurance in Portsmouth, NH. This page focuses on what changes when the house is historic.

Why is a historic Portsmouth home harder to insure?

Three things set a historic home apart. First, it can be expensive to rebuild: hand-planed trim, plaster walls, wide pine floors and old-growth framing take skilled trades and time. Second, its systems may be older, and carriers look closely at wiring, plumbing, heating and the roof. Third, rebuilding may have to meet both current building codes and, in the Historic District, design review.

None of that makes an older home uninsurable. It means the policy has to be built around the house, and the application has to describe the house accurately.

Should you insure for replacement cost or functional replacement cost?

Market value and rebuild cost are different numbers. Market value includes the land and the location. Rebuild cost is what it would take to put the house back. In Portsmouth’s older neighborhoods, either one can be higher. Your dwelling limit should be based on rebuild cost.

Replacement cost

The New Hampshire Insurance Department describes replacement cost as the amount needed to replace or rebuild your home or repair damage with materials of similar kind and quality, without deducting for depreciation. For a historic home, “similar kind and quality” can mean plaster, custom millwork and period details, which is why the limit has to be set carefully. Some carriers offer extended or guaranteed replacement cost endorsements that add a cushion above the dwelling limit. Ask what applies to your home.

Functional replacement cost

Some policies pay to restore the home with modern materials that serve the same function, such as drywall in place of plaster or a modern stair in place of a carved one. This form can make an older home easier to place, and some owners are comfortable with it. Others want the details back. Decide which house you would want rebuilt before you choose the form.

For larger historic homes, high-value carriers such as Chubb may also be options, with their own approach to rebuild cost. Our page on high-value home insurance in Portsmouth explains how those policies differ.

What does ordinance or law coverage do for an older home?

When an older house is damaged, the repairs may have to meet today’s building, electrical, plumbing or energy codes. Standard homeowners policies typically exclude or tightly limit those extra costs. Ordinance or law coverage, often added by endorsement, helps pay for:

• The extra cost of rebuilding the damaged part of the home to current code.
• In some forms, the value of an undamaged portion that has to be torn down because of a code requirement.
• In some forms, the cost of demolishing and removing that undamaged portion.

The limit is often set as a share of the dwelling limit, and the default may be modest. For a historic Portsmouth home, it is worth asking for a higher limit and reading which of the three parts your policy includes.

How does Portsmouth’s Historic District Commission affect a rebuild?

According to the City of Portsmouth, a Certificate of Approval from the Historic District Commission is required for certain exterior changes to buildings and structures in the Historic District. The Commission typically meets the first Wednesday of each month, and often a second Wednesday when there are many applications.

The City’s Resident Guide to Land Use Boards says the Commission reviews exterior work visible from a public way, including windows, doors, siding, roofing, trim, additions and demolition. Interior-only work generally is not reviewed, and like-for-like repairs are easier to approve than visible changes in material or design. The City’s inspection FAQ adds that exterior repairs in the Historic District require building permit review by the Planning Department, and that HDC review adds at least an extra month to the process.

Why that matters for insurance:

• Rebuilding may take longer, so check how long your loss of use coverage lasts and whether it has a dollar or time limit.
• The Commission may expect matching materials, such as wood windows, clapboards or slate. Your dwelling limit and form should account for that.
• Keep photos, measurements and records of the exterior details. They help both the adjuster and the HDC application.

Not sure whether your home is in the district? The City recommends checking its MapGeo map or asking the Planning Department before you assume. The HDC application instructions list what an application needs.

Will knob-and-tube or older wiring affect your insurance?

Wiring is one of the first questions on an older home. Many carriers will not write a home with active knob-and-tube wiring, and some ask about older fuse panels or ungrounded circuits. Others will consider the home with an electrician’s report or a plan to update the wiring. If the home has been partly rewired, records showing what was done and when are worth gathering before you apply.

Carriers ask similar questions about plumbing (older galvanized or cast iron lines), heating (oil tanks, boilers, wood stoves) and the age of each update. Accurate answers lead to fewer surprises later.

How do plaster walls and original details affect a claim?

Plaster on lath is common in Portsmouth’s older homes. Repairing it after a water leak or fire usually takes a plasterer, not a drywall crew, and matching a section of a decorative ceiling can take time. The same is true of original trim, mantels, paneling and floors. Under a replacement cost form, those details may be repaired in kind, subject to your limit. Under a functional replacement cost form, they may be replaced with modern equivalents. Make sure your form matches what you expect.

Photos and notes of interior features, room by room, are a simple way to document what the house has. Keep them somewhere other than the house.

What do insurers look for with slate and older roofs?

A well-kept slate roof can last a very long time, and carriers often view it differently from an asphalt roof of the same age. They may still ask about missing or broken slates, flashing, copper valleys and the last time a slater looked at it. Repairs also take specialized roofers. Other older roofs, such as wood shingle or roofs with several layers, may draw more questions. Our post on what happens when a roof triggers a cancellation or nonrenewal covers that side of underwriting.

What happens during an underwriting inspection?

Many carriers inspect older homes, often after the policy starts. An inspector may photograph the exterior and roof, and some inspections include the interior, the electrical panel and the heating system. If something needs attention, the carrier may ask for repairs within a set time, or decide not to continue the policy. A few steps help:

• Gather records of updates to the roof, wiring, plumbing and heating, with dates.
• Address loose railings, damaged steps and peeling exterior paint before the inspection.
• Tell us about any planned renovations so the policy fits the work.

What else should owners of older Seacoast homes review?

• Flood. Homes near the Piscataqua, the back channels or the South Mill Pond may face flood risk, and flood is excluded from homeowners policies. See our flood insurance page.
• Condos in historic buildings. Many downtown condos are in older buildings. Our page on condo insurance in Portsmouth explains how your unit policy works with the master policy.
• Multi-family and rental. If you rent part of an older house, see our page on landlord insurance in Portsmouth.

How do we quote a historic home in Portsmouth?

We start with the house. We ask for the year built, square footage, construction and notable interior and exterior details, along with update dates for the roof, wiring, plumbing and heating and any inspection reports. We then compare dwelling limits, replacement cost forms, ordinance or law limits and loss of use terms side by side. For everything else we write in the city, see our Portsmouth insurance agency page, and for the statewide picture, our New Hampshire homeowners insurance guide. For older homes elsewhere in the state, see older and historic home insurance in New Hampshire.

Get a historic home insurance quote

Tell us about the house and its updates, and we will compare carriers. Prefer to talk? Call (603) 431-4020.

Frequently asked questions

What counts as a historic home for insurance purposes?

Carriers care less about a plaque than about how the home is built. Age, construction methods, original materials and the work it would take to rebuild all matter. A home in a local historic district may also face design review when it is repaired, which can affect rebuilding.

What is the difference between replacement cost and functional replacement cost?

Replacement cost pays to rebuild with materials of like kind and quality, without a deduction for depreciation. Functional replacement cost pays to restore the home with modern materials that do the same job, such as drywall in place of plaster. The right choice depends on the home and on what you would want rebuilt.

Does homeowners insurance pay for code upgrades after a loss?

Only to the extent of your ordinance or law coverage. Standard policies typically exclude or tightly limit the extra cost of meeting current building codes. Ordinance or law coverage, often added by endorsement, helps pay for those required upgrades, up to the limit you choose.

Do I need Historic District Commission approval to rebuild after a fire?

If the home is in Portsmouth’s Historic District and the work changes its exterior, a Certificate of Approval may be required. The City exempts some like-for-like repairs, so confirm with the Planning Department. Plan for review time when you think about loss of use coverage.

Can I insure a house that still has knob-and-tube wiring?

Sometimes, but many carriers will not write a home with active knob-and-tube wiring, and others ask for an electrician’s inspection or a plan to update it. Tell us what you know about the wiring, and we will look for carriers that fit.

Will an insurer inspect my historic home?

Often, yes. Many carriers inspect older homes after the policy starts to confirm the roof, wiring, plumbing and heating. If something needs attention, the carrier may ask for repairs within a set time.

Do you charge fees to quote a historic home?

No. We do not charge fees on any policy we write. We compare 40+ carriers for historic and older homes in Portsmouth and across the Seacoast.

Sources

• City of Portsmouth: Historic District Commission
• City of Portsmouth: Resident Guide to Land Use Boards (2026), Historic District Commission
• City of Portsmouth Inspection Department: Frequently Asked Questions
• City of Portsmouth: Historic District Commission Application Instructions
• New Hampshire Insurance Department: Homeowners and Renters Insurance

This page is general information about insuring historic homes in Portsmouth, NH and is not a coverage guarantee or legal advice. Coverage depends on the policy wording, endorsements and underwriting of each carrier. City requirements change; confirm them with the City of Portsmouth Planning Department. Call (603) 431-4020 with questions about a specific property.