Permits and unpermitted work when selling a house

How the law usually works

Building work commonly requires approval from a local authority or other regulator. The approval may involve:

• A building permit or building-control approval for structural, electrical, plumbing, fire-safety, or similar work.
• Planning or zoning permission for changes to use, size, location, or external appearance.
• Separate permissions for heritage-listed buildings, flood-prone land, septic systems, or work affecting shared property.

A permit is not always required for every repair. Rules often distinguish ordinary maintenance from work that changes structure, services, safety features, or the use of the property. The exact rule depends on the location, age of the work, and type of project.

When selling, the central legal questions are usually:

• Whether you know, or reasonably should know, that work was done without required approval.
• Whether local law requires you to disclose known defects, illegal work, notices, or permit problems.
• Whether your sale contract, disclosure form, or real estate rules require particular information.
• Whether the buyer’s lender, insurer, surveyor, or appraiser will accept the property in its current condition.

In many places, sellers must not make false statements or deliberately conceal important problems. A seller may also have to disclose known facts that materially affect value or safety, even if the buyer does not ask directly. “As-is” wording may limit some claims, but it usually does not protect deliberate misrepresentation or concealment.

A local authority may be able to require inspection, correction, removal, or compliance even after the work is old. Some jurisdictions provide a process for retrospective approval, often called an after-the-fact permit, regularization certificate, building approval certificate, or certificate of acceptance. Approval is not guaranteed; the authority may require opening up walls, testing systems, carrying out repairs, or removing the work.

Common processes

1. Identify the work and investigate the records. People commonly make a list of renovations, extensions, conversions, decks, garages, electrical work, plumbing changes, and other alterations. They search the local permit or planning records and ask the local authority whether approvals exist. A building inspector, surveyor, engineer, or other qualified professional may help identify safety issues.

2. Check the sale and disclosure requirements. The seller or agent commonly reviews the property disclosure form, listing information, prior inspection reports, title documents, and any notices from the authority. They consider whether the form asks about permits, alterations, code compliance, known defects, or disputes. The answer is usually based on what is known and what the form actually asks; guessing or giving a misleading answer can create later liability.

3. Ask the authority about regularization. A building department or council may explain whether retrospective approval is available and what evidence is needed. The process can involve plans, photographs, engineer reports, inspections, testing, and fees. If the work cannot meet current standards, the authority may apply rules for older work, allow alternative solutions, or require changes.

4. Obtain professional advice. People commonly use a surveyor, architect, engineer, licensed contractor, electrician, or plumber to assess the work. Their report may distinguish a paperwork problem from a physical safety problem. A real estate lawyer or conveyancer can explain disclosure, contract, title, and negotiation issues.

5. Decide how to handle the sale. Common approaches include:

• Completing the approval process before listing.
• Disclosing the missing approval and selling in the existing condition.
• Obtaining estimates and giving the buyer a credit or price adjustment.
• Requiring the seller to complete specified work before completion.
• Agreeing that the buyer will handle approval, if local law and the contract allow it.
• Removing or restoring the unapproved work.

The written contract should clearly allocate responsibility for permits, repairs, inspections, costs, and any authority action. An informal promise by an agent or contractor may not adequately protect either party.

6. Tell the lender and insurer when appropriate. The buyer’s mortgage lender may require evidence of lawful construction or may reduce the amount it will lend. Insurers may exclude unapproved work, refuse coverage, or require correction. Existing insurance policies and the sale contract should be checked rather than assuming that a permit issue automatically cancels coverage.

7. Preserve records. People commonly keep permit searches, authority correspondence, plans, reports, invoices, photographs, inspection results, disclosure forms, and written negotiations. These records can help show what was known and what was done to address the issue.

Deadlines and time limits

Possible time limits differ substantially by jurisdiction and by the legal theory involved. Common examples include:

• A deadline for applying for a retrospective approval or responding to an enforcement notice.
• A limitation period for a buyer’s claim for misrepresentation, breach of contract, negligence, or failure to disclose.
• A deadline in the sale contract for objections, inspections, financing, or completion.
• A time period after discovery of a defect or after the transaction closes.
• A “long-stop” period that limits building or construction claims after completion, subject to exceptions.

Some building-control powers may remain available for many years, while other claims may be limited to a shorter period. Deliberate concealment, fraud, or continuing breaches can affect how a deadline is calculated. Typical periods cannot safely be applied without knowing the country, state or province, claim, contract, and date of discovery. Confirm the applicable deadline with the court, local authority, or a licensed attorney where you live.

Documents that usually matter

• The purchase and sale agreement and any amendments.
• Seller disclosure forms and written answers to buyer questions.
• Building, planning, zoning, electrical, plumbing, or occupancy permits.
• Approved plans, inspection certificates, completion certificates, or certificates of lawful use.
• Local authority enforcement notices and correspondence.
• Title records, property searches, surveys, and land registry documents.
• Contractor invoices, warranties, photographs, and renovation contracts.
• Reports from inspectors, engineers, surveyors, and specialist tradespeople.
• Insurance policies, claims records, and lender requirements.
• Records of any price reduction, credit, indemnity, or agreement allocating future work.

How it differs by jurisdiction

United States. Permit and disclosure rules are mainly state and local matters. Some states require a seller disclosure form; others rely more heavily on common-law duties not to conceal or misrepresent material defects. Local building departments generally control permits and enforcement. California, for example, has statutory residential property disclosures, including the Transfer Disclosure Statement requirements in the California Civil Code. Other states use different forms and standards. A local title company, building department, and real estate attorney can clarify whether an unpermitted improvement affects title, resale, or enforcement.

England and Wales. Building regulations approval and planning permission are separate questions. The Building Act 1984 and Building Regulations 2010 provide the main building-control framework, while planning law may require permission for development or a change of use. Building control may sometimes issue a regularisation certificate for completed work. A local authority search and the Law Society’s property information forms can reveal important information, but a seller should not assume that an old work certificate or indemnity policy proves that construction is safe or compliant.

Canada. Rules generally come from provincial or territorial legislation and municipal bylaws. For example, Ontario’s Building Code Act, 1992 supports building permits and enforcement, while municipalities administer many practical requirements. Provinces and municipalities differ on disclosure, limitation periods, zoning, inspections, and available approvals. A property lawyer or municipal building department can explain whether a permit issue affects a particular transaction.

Australia. Building and planning controls are primarily state or territory based, with local councils administering many approvals. The National Construction Code provides technical standards, but state and territory legislation governs permits, certification, enforcement, and seller disclosure. Retrospective approval may be called a building approval, permit, certificate of occupancy, certificate of compliance, or similar term. Rules and seller obligations differ across states and territories, so a conveyancer, solicitor, certifier, and council should be consulted.

When people consult a lawyer

Legal advice is particularly useful when:

• You received an enforcement, demolition, or compliance notice.
• The work involves structural changes, a secondary dwelling, a conversion, or a change of use.
• The property is heritage-listed, jointly owned, leasehold, strata, condominium, or part of an owners’ association.
• You are completing a disclosure form and are unsure what must be reported.
• The buyer threatens to cancel, sue, or demand a large reduction.
• The lender or insurer refuses approval because of the work.
• You suspect the seller, contractor, agent, or inspector concealed the issue.
• The transaction is close to completion or a limitation deadline may apply.