What Should You Know Before Buying a House?

1. Check the home's physical condition

Start with the obvious, but do not stop there. A house can have fresh paint, updated flooring, and attractive finishes while still needing substantial work on its roof, foundation, drainage, electrical system, plumbing, HVAC, windows, exterior, or other major components.

A professional home inspection is one of the most useful steps before buying. The inspection and any specialist evaluations should be treated as separate from your permit and property-record research. Each answers a different question.

Pay particular attention to signs of water intrusion, settlement, drainage problems, roof deterioration, aging mechanical equipment, electrical concerns, plumbing problems, and alterations that appear newer than the rest of the home. Those observations can also tell you where to investigate the records.

2. Review the property's records

Public property records can provide context that is not obvious from a listing. Depending on the jurisdiction, available records may include permit information, building records, property information, inspection records, or other documents.

Record systems are not standardized across the United States. Some jurisdictions provide searchable online databases. Others may require a request to the relevant department or provide records through a different public-records process.

If you want to research a property before buying it, start with the address. Permitrust's Building Permit Records guide explains why these records can be useful when investigating construction history.

3. Check the building permit history

Permit history is particularly important when a house has clearly undergone significant changes. Look for records that may correspond with additions, finished basements, remodeled kitchens or bathrooms, decks, garages, structural alterations, conversions, or major system work.

The goal is not simply to collect a list of permits. You want to compare the documented history with the property you are actually considering.

You can also use Permitrust's Permit History by Address guide when researching previous construction associated with a property.

4. Compare visible work with documented work

This is one of the most useful parts of property research. If a house appears to have a large addition but the records you find do not appear to reflect it, that does not automatically prove something is wrong. Records can be incomplete, difficult to locate, stored under different addresses or parcel information, or handled by another authority.

It does mean you should investigate the discrepancy before making assumptions. Ask the seller, listing agent, permitting department, or other appropriate source for clarification.

Likewise, a permit record does not by itself prove that every aspect of the finished work is compliant. The record should be treated as one piece of the property's overall history.

5. Understand what unpermitted work could mean

Unpermitted work is construction or alteration that was performed without a required permit. Whether a particular project required a permit depends on the local rules and the nature of the work.

Potential consequences vary by jurisdiction. Depending on the circumstances, the owner may have to deal with additional inspections, correction work, penalties, documentation problems, or other requirements.

If you suspect that work was completed without required approval, do not guess about the consequences. Ask the authority having jurisdiction what its process is and what documentation it requires.

See Permitrust's Unpermitted Work guide for more background.

6. Check zoning before assuming you can change the property

Zoning is easy to overlook when you are focused on buying the house itself. It becomes important the moment you want to add a structure, expand the home, change the use, modify parking, build a deck, install an accessory structure, or make another significant change.

Local zoning rules can address setbacks, lot coverage, height, permitted uses, accessory structures, parking, and other development requirements. Building codes and zoning are related but are not the same thing.

If your reason for buying a particular property includes a future project, research that project before closing. Do not assume that because neighboring homes have a particular structure, your property will automatically qualify for the same change.

7. Test your future plans before you buy

This is where many buyers make a preventable mistake. They buy a property because it fits their current needs, then discover that the change they had planned is difficult, restricted, expensive, or not allowed in the way they expected.

If you already know your plans, write them down before making an offer.

• Add a deck
• Build or expand a garage
• Finish a basement
• Add another bedroom
• Enlarge the kitchen
• Add a bathroom
• Build an accessory structure
• Add living space
• Change the property's use

Then ask the local authority what approvals, setbacks, zoning restrictions, permits, or other requirements would apply. You do not necessarily need a complete design before buying, but you should know whether your basic idea is realistic.

8. Look at the age and history of major improvements

A listing may describe a roof, HVAC system, windows, kitchen, electrical service, or other component as “updated.” Ask when the work was done, who performed it, what documentation exists, and whether permits were required and obtained.

This is not about assuming that old work is bad or that permitted work is automatically good. It is about building a more complete picture of the property's history.

When available, permit records can provide dates, descriptions, permit types, and other information that helps you investigate substantial improvements.

9. Understand the difference between an inspection and a permit record

These are not interchangeable.

The best due-diligence process uses these sources together rather than treating any one of them as a complete answer.

10. Ask whether the property has known code or permit issues

If you discover an unusual addition, conversion, deck, garage, basement, structure, or renovation, ask whether there are known open permits, unresolved inspections, code concerns, or other outstanding issues.

The exact records and terminology vary between jurisdictions. A local permitting department is the appropriate authority for confirming the current status of an identified issue.

If you need to search existing permit information, Permitrust's Building Permit Search guide can help you understand the research process.

11. Check the property tax and ownership information

Property taxes are a separate part of your buying decision. Review the available property information and understand the current tax situation rather than assuming the seller's current payment will be identical to your future obligation.

Your lender, real-estate professional, title company, tax authority, and other appropriate professionals can provide the information relevant to your specific transaction.

12. Consider insurance and previous claims

Insurance availability and cost can affect whether a property works financially for you. Ask the appropriate insurance professional about the property's specific characteristics, age, condition, location, and other factors relevant to coverage.

If the seller has disclosed previous damage or repairs, make sure you understand what happened and what was repaired. For significant work, compare the physical evidence with the available documentation.

What should you ask before making an offer?

You do not need to interrogate the seller with dozens of questions. Focus on questions that could change your decision, your budget, or your future plans.

What should you check during the inspection period?

Your inspection period is an opportunity to investigate the property rather than simply look for cosmetic defects.

• Roof and visible exterior condition
• Foundation and signs of movement or water intrusion
• Drainage around the property
• Electrical system and visible safety concerns
• Plumbing and visible leaks
• Heating and cooling systems
• Windows, doors, and exterior envelope
• Attic, basement, crawlspace, and other accessible areas
• Additions and remodeled areas
• Exterior structures such as decks, sheds, and garages

Your inspector may recommend specialist evaluation when a particular issue falls outside the scope of a standard inspection.

What should you know about a house with an addition?

An addition is worth investigating because it changes the original structure and can involve several types of review. Look for evidence of when it was built, how it connects to the original house, and whether relevant permits or records are available.

You should also understand whether the addition affects setbacks, lot coverage, drainage, utilities, or other property constraints.

What about a finished basement?

A finished basement deserves its own questions. Determine what work was performed, whether walls or utilities were changed, whether there are signs of moisture, and whether the space is represented consistently in the property's available records.

If the basement was converted into bedrooms or living space, ask specifically about the work and the requirements that applied when it was completed.

What about a deck, garage, or other exterior structure?

Exterior structures can be easy to overlook because they are not part of the main house. They can still be subject to zoning, setback, building, structural, or other local requirements.

If the property has a deck, garage, shed, or other substantial structure, investigate when it was built and whether relevant records are available. If you plan to build your own deck later, you can also review the Permitrust Deck Permit Guide .

What if the seller says permits are not important?

Do not rely on a casual statement either way. Permit requirements are determined by the applicable local rules and the nature of the work.

If substantial work was performed, ask for documentation and independently verify what records are available. The objective is not to create a problem where none exists. It is to avoid discovering an important property-history issue after closing.

A practical house-buying research checklist

Before you commit to a property, work through this list:

• Property address confirmed
• Local jurisdiction identified
• Professional inspection arranged
• Major systems reviewed
• Seller disclosures reviewed
• Major additions and renovations identified
• Building permit records researched where available
• Permit history compared with visible work
• Potential unpermitted work investigated
• Zoning reviewed for intended future projects
• Property tax information reviewed
• Insurance questions discussed with the appropriate professional
• Known repairs, claims, and defects investigated
• Future renovation plans tested before closing

How to research a house by address

Address-first research is usually the cleanest way to organize your investigation. Once you have the property address, you can identify the relevant local authority and search for the records associated with that property.

Start with the Building Permit Search if you are specifically looking for construction records. You can also review the Permit History by Address resource for a property-focused approach.

If you are researching an older property, the Building Permit Records guide can also help explain why records may be relevant.

What if you find something you cannot explain?

Do not immediately assume the worst. A mismatch between what you see and what you find in a record can have several explanations.

• The record may be under a different address format.
• The work may have been handled by a different department.
• The available online database may not contain older records.
• The project may not have required a permit.
• The records may require a formal public-records request.
• The visible work may not be what you initially assumed it was.

When something does not line up, verify it with the appropriate local authority rather than making a decision based on an incomplete search result.

Should permit history affect your decision to buy?

It can be relevant, particularly when the property contains substantial additions, conversions, remodels, or other work that affects value or your plans for the home.

But permit history should be considered alongside the inspection, seller disclosures, title and property information, zoning, insurance, financing, and other parts of your due diligence.

One missing record is not automatically proof of illegal construction, just as one permit record is not proof that the entire property is free of problems. The useful approach is to investigate the specific issue and understand its implications before closing.

The biggest mistake to avoid when buying a house

The biggest mistake is treating the listing as the complete story.

A listing tells you what the seller is presenting. An inspection tells you about physical condition. Public records can reveal parts of the property's history. Zoning tells you about development rules. Permit records can help connect previous construction with the property's documented history.

Final house-buying checklist

You do not need to become a building-code expert to make a better property decision. You do need to investigate the parts of the property that could affect your money, safety, ownership, or future plans.

Check the condition. Review the records. Investigate significant work. Check permits where available. Understand zoning. Ask about known problems. And if you are buying the house because you have a specific project in mind, research that project before you close.

Permitrust can help organize property-specific permit research around an address. It is not a government agency and does not replace the local permitting authority, a professional home inspection, a title professional, an insurance professional, or other qualified professionals involved in a home purchase.