To get the original blueprints for your house, start with the local building or permit office that reviewed the construction, then work outward to the original architect or builder, previous owners, and local historical archives. Most jurisdictions required the builder to submit plans when applying for the construction permit, so a copy usually lives in a government file somewhere. Finding a complete set is not guaranteed, especially for older homes, but most homeowners can track down at least partial plans with some persistence. If the originals are truly gone, a professional can measure your home and draft new plans that reflect what is actually there today.
Pull Your Property Details Together First
Before you start calling offices, gather everything you know about the property. The more detail you can hand over, the faster someone can pull the right file.
- Full current address, including any unit or lot number. Addresses get reused and renumbered over the decades, so confirm what the county has on file matches what you have.
- Your Assessor’s Parcel Number (sometimes called a tax ID or PIN). It is the unique identifier your county uses, and it eliminates confusion when nearby addresses are similar. Look on your property tax bill, your deed, or the county assessor’s website.
- Approximate year built. Even a rough decade narrows the search and tells staff which archive to check.
- Builder or architect name, if you have it. Check your closing documents, the original listing, or a plaque on the house itself.
- Previous owner names. Permits are often filed under the name of whoever owned the property at the time of construction, and your deed chain or title report should list them.
Start With Your Local Building Department
Most cities and counties require anyone doing construction to submit plans for review before issuing a permit. That means your local building, planning, or permit office is the most likely place to find whatever the original builder filed. For homes built in the last few decades, records are often digitized and searchable through an online permit portal. For older homes, plans may sit on microfilm, in paper archives, or in an offsite warehouse.
To get copies, you typically file a public records request with the relevant department. Many jurisdictions have a standard form on their website. Include your parcel number, address, and the approximate construction year. Some offices let you search and view records online before you even file a formal request.
A few practical realities to plan around. Fees: most agencies charge for copies, and oversized architectural sheets cost more than standard pages because they need large-format printing. Ask for an estimate upfront. Timing: response times for public records requests vary widely depending on your jurisdiction and how backlogged the office is. Weeks rather than days is common. Completeness: what the builder submitted for a permit may be a stripped-down set of structural and site plans rather than the full architectural drawings with every interior detail. You might get the foundation plan and the framing layout but not the kitchen cabinet elevations.
One wrinkle that catches people off guard: some jurisdictions restrict access to plans for security-sensitive structures like courthouses, water treatment plants, and other government facilities. If your property was previously a public building or sits on certain kinds of infrastructure, parts of the plans may be redacted or withheld.
Contact the Original Architect or Builder
Architects and builders often keep archives of past projects, sometimes for decades. A firm that designed your home in 1985 may still have the original drawings in a flat file or scanned into a digital archive. That is especially true for firms specializing in residential work, since their old drawings are useful references for future projects in the same style or neighborhood.
If the firm is still in business, a phone call or email explaining that you own the property and want copies of the original plans is usually all it takes. They may charge a reproduction fee, and there is a copyright issue to be aware of (more on that below), but most firms are happy to help a current owner.
For tract or subdivision homes where a single developer built dozens or hundreds of similar houses, the builder likely has standard plan sets organized by model name. If you know the model name, or can identify it by comparing your layout to neighbors’ homes, the builder or their successor company may be able to pull the right set quickly.
If the original firm has closed, try searching for the architect through your state’s licensing board. Retired architects sometimes transfer their archives to a successor firm, a university, or a local historical society.
Ask Previous Owners and Check Your Own Closing Packet
This is the avenue people overlook most often. Previous owners sometimes received a copy of the blueprints at closing or directly from the builder, and those copies may have been passed along with the house or sitting in a box the seller kept. If you have any way to reach a prior owner, ask. A friendly letter forwarded through your real estate agent sometimes works.
Check your own closing documents carefully too. Title companies occasionally include copies of site plans, surveys, or floor plans in the closing package. A survey is not the same as a full set of blueprints, but it shows property boundaries, the building footprint, setbacks, and easements, which covers a lot of what people actually need when they ask for “the blueprints.”
Neighbors in the same subdivision are another underused resource. If your home shares a floor plan with houses nearby, a neighbor who kept their plans can give you an identical or nearly identical set.
Search Local Archives and Historical Societies
For homes built before modern permit systems existed, local historical societies, public libraries, and university special collections are worth exploring. Many communities maintain archives of local architectural records, especially for homes by notable builders or in historic districts. The Library of Congress and state historic preservation offices also hold architectural collections, though these tend to focus on landmark properties rather than typical residential homes.
If your home is listed on or eligible for a historic register, the nomination file itself may include floor plans, photographs, and architectural descriptions. Your state historic preservation office can tell you what documentation already exists.
Copyright Rules for Architectural Plans
Here is where things get more complicated than most homeowners expect. Architectural plans are copyrighted creative works under federal law, and the copyright belongs to the architect, not the homeowner, unless the contract explicitly transferred it.1Office of the Law Revision Counsel. 17 U.S. Code 102 – Subject Matter of Copyright: In General Buying a house does not give you the right to copy or reproduce the architect’s drawings. What you typically hold is a license to use those plans for your specific project on your specific property.
Copyright on architectural works lasts for the life of the architect plus 70 years. For plans created as a work for hire, which is common when a firm’s employee does the drafting, protection lasts 95 years from publication or 120 years from creation, whichever comes first.2Office of the Law Revision Counsel. 17 U.S. Code 302 – Duration of Copyright: Works Created on or After January 1, 1978 Congress extended copyright protection to architectural works in 1990, so plans for most homes built since then are still protected.
What this means in practice: if you pull blueprints from your building department’s public records, you can generally use them as a reference for your own renovation planning. Reproducing and distributing them, or handing them to a new builder to construct a duplicate house, can create copyright problems. When in doubt, contact the original architect. Most will grant permission for reasonable use by the current owner, sometimes for a fee. If the home is old enough that copyright has expired, none of this applies.
When the Originals Cannot Be Found: As-Built Drawings
When the original plans truly cannot be found, or when your home has been modified so heavily that the originals no longer reflect reality, hiring a professional to create as-built drawings is the most reliable path. An architect, draftsperson, or surveyor visits the property, measures every room, wall, ceiling height, and structural element, and produces a new set of plans documenting the home as it stands today.
Cost depends on the home’s size, complexity, and how much detail you need. A basic floor plan with room dimensions costs significantly less than a full set that includes structural, electrical, plumbing, and mechanical systems. Expect to pay roughly $0.50 to $3 per square foot for residential as-built services, with unusual layouts, multiple additions, or detailed MEP plans pushing toward the upper end. Some firms use 3D laser scanning (LiDAR) and charge a premium for it, but the results come back faster and more precise.
As-built drawings are often more useful than original blueprints anyway. If you are planning a renovation, your contractor needs to know what the house looks like now, not what the builder intended 40 years ago. Walls get moved, additions get built, kitchens get reconfigured. As-builts capture all of that.
DIY Floor Plan Tools for Rough Layouts
If you only need a rough layout rather than construction-grade plans, several apps and software tools let you sketch a basic floor plan from your own measurements. Options range from free browser tools to paid apps that use your phone’s camera or LiDAR sensor to scan rooms. The results are not a substitute for professional drawings and should not be used for permit applications or structural work, but they work well for space planning, furniture layout, and communicating ideas to a contractor before the formal design phase.
For the best results, measure with a laser measuring device rather than a tape measure, note wall thicknesses at doorways, and mark the locations of windows, doors, and built-in features. Even an imperfect floor plan you made yourself gives a contractor more to work with than a verbal description.