How to Pull a Permit History Before You Trust the House

Why this matters

The house tells you what is there. The permit history tells you what anyone ever inspected, and the gap between the two is where a routine job turns into a failed inspection, a stalled permit, or a wire you own because you were the last one to touch it. A water heater permit that cannot be issued because a 30-year-old permit at the same address was never closed is a real and common delay. Fifteen minutes on the jurisdiction's records before a large quote finds most of it while it is still cheap to plan around.

This card is the research method. What to do once you have found work nobody permitted, and how it plays in a sale, belong to the unpermitted-work cards listed at the end.

Step 1: Pin the parcel before you search the address

Look the property up on the county assessor's or property appraiser's site and write down the parcel number (also called the APN or PIN), the year built, the recorded living area and the lot size.

Reason: permit systems index by address, and addresses lie. Streets get renamed, houses get renumbered, a corner lot has two frontages, a unit number gets dropped. The parcel number does not change with any of that, and most permit portals can search on it. The assessor's living area and year built are also your first check against the house itself in Step 5.

What breaks if you skip it: a search on "1418 Ridge Rd" returns nothing because the permits were filed under "1418 Ridge Road" or the pre-renumbering address, and you conclude the house has no history.

Step 2: Find out who issues permits for that parcel

Work out which jurisdiction holds the records, which is not always the obvious one:

• Incorporated city or unincorporated county. A mailing address in a city does not mean the parcel is inside city limits. The assessor record or the county GIS usually shows the jurisdiction.
• Annexation. A parcel annexed into a city may have older permits at the county and newer ones at the city.
• Trade-specific issuers. In a few states some trade permits, electrical most often, are issued and inspected by a state agency or a separate local office rather than the building department, so a complete history can sit in two systems.
• Utilities and health departments. Septic systems and private wells are usually permitted by the county or state health department, not the building department. See related: Wells, Septic and the Setbacks Between Them.

What breaks if you skip it: you search one system, find a thin history, and miss the other half.

Step 3: Search the online portal three ways

Most jurisdictions now run an online permit portal. Search by parcel number, then by address with and without the street-type abbreviation, then by address range or street name alone if the portal allows it. Pull every result, not just the recent ones.

For each permit, record the permit number, type, issue date, description, status and final inspection date if one is shown. Portals vary in how far back they go. Many were loaded from a conversion of older records at a cutoff date, often somewhere in the 1980s or 1990s, and anything earlier exists only on paper or film. The portal rarely tells you where its cutoff is; ask the counter.

What breaks if you skip the extra searches: permits indexed under a variant address stay invisible, and the history looks shorter than it is.

Step 4: Read the status, not just the list

A permit's existence tells you work was proposed. Its status tells you whether anyone inspected it. Terms differ by jurisdiction, but the meanings group like this:

An expired or open permit is the expensive finding. Some jurisdictions will not issue a new permit at the address, or in that trade, until old open permits are resolved, which can mean re-inspecting work that was buried decades ago. Others ignore old permits entirely. Which kind you are dealing with is a question for the permit counter, asked before you promise a start date.

Step 5: Compare the record with the house

Now walk the house, or the photos, with the permit list and the assessor's data in hand, and look for three kinds of mismatch:

• Square footage. Living area on the house that is not on the assessor record and has no addition permit. An enclosed porch, a garage converted to a room, a finished basement.
• Systems. A heat pump with no mechanical permit, a panel visibly newer than the last electrical permit, a tankless water heater on a gas line nobody permitted, a second bathroom with no plumbing permit.
• Age. Equipment or materials clearly newer than any permit in that trade, or permits for equipment that is no longer there.

Be careful with what a missing permit means. It is not proof the work was unpermitted. Records get lost in conversions, older work predates the jurisdiction's permit requirement, and a permit filed under a previous address or the contractor's office address can hide for years. A missing permit for an obvious addition is a question to ask the owner and the counter, not a finding to put in writing to a customer.

Step 6: Request what the portal does not show

For anything earlier than the portal's cutoff, or for plan sets and inspection notes, file a public records request with the building department. Every state has a public records law that reaches permit records, with different response deadlines and fees, and some jurisdictions handle routine permit lookups at the counter without a formal request.

Plans are the exception to watch. In some states, California among them, the building department will not copy a house's plans without the owner's consent and, depending on the state, the designer's. Permit cards and inspection records are usually released freely. Ask for the permit card or address file by parcel number, the date range, and inspection results, and say which trades you care about. Older records are often on microfilm and can take days, which is a reason to start this early on a large job.

Worked example: a heat pump quote on a 1962 ranch

The job is a ducted heat pump to replace a gas furnace, plus a water heater replacement. The assessor shows the parcel built 1962, living area 1,420 sq ft. On site, the house has a rear family room the owner says "came with the house", which the tech paces at roughly 14 by 22 feet, about 308 sq ft.

The portal search by parcel number returns four permits; the address search returns three of them and misses one filed under "Ridge Road":

PERMIT HISTORY - PARCEL 042-118-07
No.       Type    Issued     Description          Status
B87-0412  Bldg    1987-05-11 Reroof, tear-off     FINALED
P94-1173  Plmb    1994-02-08 Water heater replace EXPIRED
M09-2260  Mech    2009-10-02 Furnace and AC c/o   FINALED
E09-2261  Elec    2009-10-02 AC disconnect, circ  FINALED
No permit found for: family room addition

What the tech takes from it:

• The family room. The original block measures close to the assessor's 1,420 sq ft on its own, so the room's roughly 308 sq ft is not on the record, and there is no addition permit. The room could predate the portal, could have been permitted under a lost record, or could be unpermitted. The duct run to it is part of the new system's design, so this matters to the load calculation and possibly to the inspector.
• The 1994 water heater permit expired without a final. The current water heater is a different unit, but the expired permit is still on the record.
• The 2009 mechanical and electrical permits finaled. The AC circuit and disconnect were inspected, which is useful for a heat pump that will reuse that circuit if its rating fits the new unit.

The tech calls the permit counter with the parcel number before quoting. The counter confirms the jurisdiction does hold new plumbing permits until an expired permit in the same trade is closed, and that closing it here means a plumbing inspector visits to look at the current water heater installation. It also says its paper records begin in 1955 and offers a records request for the family room.

The quote changes in two ways. The water heater line now carries the inspection to close P94-1173, scheduled with the new install, and a note that the start date depends on it. The heat pump line notes that the family room's construction is unconfirmed and that the load calculation treats it as conditioned space; the records request goes in the same day.

What changes the answer: in a jurisdiction that ignores old expired permits, the water heater proceeds on a normal permit and the 1994 record is a note in the file. If the records request turns up a 1971 addition permit, finaled, the family room question closes. If it turns up nothing, the owner's decision about that room belongs to the unpermitted-work cards, and your heat pump permit covers your work, not the room.

How to verify you pulled a complete history

• You searched by parcel number and by at least two address variants, and the results agree.
• You know which agency holds each trade's permits for that parcel, and you searched each.
• You know the portal's earliest record date, and you either requested the paper file or decided the job does not need it.
• Every open or expired permit has an answer from the counter about whether it blocks new work.
• Every mismatch between the house and the record is written in the job notes as a question, with who you asked and what they said.

References

• Your jurisdiction's building department records policy and your state's public records law.
• County assessor or property appraiser parcel records.
• See related: The Public Record of a House and How to Read It; What to Do When You Find Someone Else's Unpermitted Work; Open Permits and Unpermitted Work in a Sale; How to Research a House Built Before Online Records.