Before you fall for a remodeled Eichler or a mid-century ranch with a "bonus room," check permit history. A house from the 1950s or 1960s has had decades to collect changes: a carport turned into a room, an atrium roofed over, a kitchen moved, a new electrical panel, a heat pump where the radiant boiler used to be. Some of that work was permitted and inspected. Some wasn't. The city's records are the fastest way to tell which is which.
This guide shows where permit records live for Bay Area mid-century homes, how to search them step by step, how to get copies of the original plans, and what to do when the house and the paperwork don't match. It's written for buyers in a contingency period, but owners getting ready to sell can use the same process.
Why the permit record matters for a mid-century house
California's Real Estate Transfer Disclosure Statement asks the seller two direct questions: whether they're aware of room additions, structural modifications or other alterations or repairs made without necessary permits, and whether they're aware of any not in compliance with building codes. The form also says plainly that it's not a warranty and not a substitute for inspections. A seller can only disclose what they know, and work done two owners ago may be news to them.
A newer rule adds detail for quick resales. Civil Code section 1102.6h, added by AB 968 in 2023, applies when the seller accepts an offer on or after July 1, 2024. A seller who accepts an offer on a single-family home within 18 months of taking title must disclose room additions, structural modifications, other alterations or repairs made since then by a contractor the seller hired, name the contractor for jobs above a small dollar threshold, and give the buyer copies of any permits the seller obtained.
The permit record helps you weigh three things: whether finished work was inspected, whether any permits were opened and never closed, and how much of the original house remains. That last question matters on an architectural home, and our mid-century modern design guidelines page explains why.
Where the records live
Permits are usually kept by the city building department for incorporated areas and by the county for unincorporated pockets. If the area was annexed after the house was built, ask both. A few local tools:
Palo Alto: Palo Alto Permit View lets you search building, planning and code enforcement activity by property address, date or application type, and by assessor's parcel number.
San Jose: the city's online permit search lists permit history along with zoning designation, plan review status and property information.
Sunnyvale and other cities: check whether the building division offers an online permit search; for anything not online, ask the permit center or building records counter, or the city clerk about a public records request.
Older records may be partial or kept on microfilm, scanned cards or paper. If an online search turns up little for a house built in the 1950s, that doesn't mean nothing was ever permitted. Ask the records staff what exists for the address.
A step-by-step search
Confirm the jurisdiction. Make sure the parcel is inside city limits. If it's unincorporated, the county holds the records.
Search by address and by parcel number. Addresses get renumbered and mistyped; the parcel number is more reliable.
List every permit. Note the permit number, the date, a short description (reroof, addition, electrical service, water heater) and the status.
Flag open items. A permit that was issued but never received a final inspection, or that expired, is a question for the seller and possibly for the city.
Request the documents. Ask for inspection records, approved plans and any certificate of occupancy for additions.
Ask for the original plans. See the next section.
Walk the house with your list. Match each permit to something you can see, and each visible change to a permit.
Getting copies of the original plans
For Eichlers and other architect-designed tracts, the original drawings give you a reliable baseline. Viewing and copying are handled differently. California law requires a building department, before copying plans prepared by a licensed, registered or certified professional, to first try to contact that professional for permission and to get the property owner's authorization. Palo Alto's procedure, revised August 18, 2026, is one example. The city writes to the owner and to the architect or engineer. The owner has to give permission; no answer within 30 days doesn't count as approval. A design professional who doesn't answer within 30 days is treated as having approved. The requester also signs an affidavit agreeing to use the copies only for the maintenance, operation and use of the building.
If the city can't release a set, compare the house with the published model plans. Our mid-century floor plans collection is a good place to match a model and spot where walls moved.
Reading the results against the house
With the permit list and a plan in hand, walk the house room by room:
Square footage and room count. Extra bedrooms, a rear addition or a bath where the plan shows a closet should line up with permits.
The carport and atrium. Enclosed carports and roofed or glassed-in atriums are changes to look for on any Eichler-type plan. Check for permits for the walls, roof, electrical and any heating added.
Systems. A newer electrical panel, a heat pump or a replacement water heater normally comes with its own permit.
Roof. Reroofs and roof insulation are often permitted separately from interior work.
Windows and doors. Replacement glass walls and sliders may show up as their own permits.
One more rule to know if you plan to fix something: under Civil Code section 1101.4, a permit applicant doing alterations or improvements to a single-family home built on or before January 1, 1994, must replace noncompliant plumbing fixtures with water-conserving ones before the city gives final permit approval. Budget for it, and ask the building department which permits trigger the rule.
What to do when the paperwork and the house don't match
Gaps turn up in older houses, and they're easier to handle when you find them early. Ask the seller what they know and whether they have receipts or contractor names. Have your home inspector and, if needed, a licensed contractor or engineer look closely at the unpermitted area. Ask the building department what legalizing it would involve, and whether it offers a pre-application meeting. Then decide with your agent whether to ask for a repair, a credit or a price change, or to accept the condition as it is. Our Eichler renovation guide can help you think through what a fix would take.
Frequently asked questions
Are building permit records public?
Permit activity is generally searchable by the public; Palo Alto and San Jose both offer online permit searches, and other cities may as well. Copies of plans are different: state law requires the building department to seek the design professional's permission and the owner's authorization before copying them.
Can I get copies of the original Eichler plans?
Sometimes. If the city kept the plans, you can request duplication, and the city will contact the owner and the original professional. In Palo Alto, the owner has to approve, while a professional who doesn't answer within 30 days is treated as having approved.
Does the seller have to disclose unpermitted work?
The Transfer Disclosure Statement asks whether the seller is aware of additions, modifications, alterations or repairs made without necessary permits or not in compliance with building codes. Sellers answer based on what they know, which is why your own records search matters. For legal questions about a disclosure, talk with a real estate attorney.
Related reading
Mid-Century Home Inspection Checklist: What to Check, System by System
Mid-Century Modern ADU: Adding a Unit Without Fighting the House
Want help pulling permit records on a home you're considering? Call or text the Boyenga Team at (408) 373-1660 or (650) 383-8606, or contact the Boyenga Team. Rules and procedures vary by city, so confirm the details with the local building department.
