BUY THE LAND WITH YOUR PLANS IN MIND
A little more outdoor space can be a big part of the appeal of a Cunningham or Sango home. You may be picturing a workshop, a pool or another bedroom someday. Before you make those plans part of the purchase, find out how the property handles wastewater and where the approved system belongs.
By Kristy Nakamura & Austin Nakamura · TN Home Collective, brokered by eXp Realty. Official sources reviewed November 14, 2026.
A large yard is not the same as available building space
First confirm whether the exact property uses public sewer or an onsite septic system. Neither an area name nor the size of the lot answers that question. If septic is present, separate the approved records, the system's current condition and your future plans. Each needs a different answer.
Start here: request available septic records and match them to the property before assuming a room count or backyard project will work.
What was permitted?
What needs evaluation?
What needs new review?
01 · GET THE PROPERTY-SPECIFIC FILE
Start with the permit and available system records
Montgomery County Building & Codes directs permit applicants to obtain the septic file from TDEC. Its permit-types page links the state's septic-record search. Use the address and available parcel information, and ask for help if a file is missing or does not clearly match the home.
Read what the records actually authorize, including the approved system and capacity information. A listing's bedroom count, a finished room or the number of people who have lived there is not a substitute for that file. Ask TDEC or the appropriate qualified professional to explain unclear information instead of interpreting a sketch on your own.
The online file is a starting point, not proof that every later alteration was approved. Compare the records with the existing house and any known additions or changes.
TDEC septic-record search → · TDEC septic-system questions →
02 · RECORDS ARE NOT AN INSPECTION
What was approved and how it works now are different questions
Ask the seller for available service, pumping, repair and alteration records. Discuss an appropriate septic evaluation with qualified professionals and clarify its scope, access requirements and limitations before relying on the result. A recent pumping receipt alone does not establish the condition of every part of the system.
Locate, do not guess
Ask how the tank, disposal area and any designated replacement area are identified. Do not assume the nicest open patch is available for a driveway, building or deep-rooted planting.
Keep the visit safe
Do not open a tank, enter a system or dig to find components yourself. Use qualified help and authorized access. A property tour is not a system test.
The EPA homebuyer septic guide recommends a septic-service-provider inspection before purchase and explains the records and components to discuss. Confirm drinking-water service separately: a home with septic does not necessarily use a private well.
If concerns appear, clarify what further evaluation or estimates are needed while your purchase deadlines still allow informed decisions. Do not treat a permit as a warranty or an inspection as a guarantee of future performance.
03 · ASK BEFORE DESIGNING THE ADDITION
More bedrooms, a pool or a shop can change the question
TDEC identifies modifications that can require review, including additional bedrooms and proposed features such as a pool, garage, shop or barn that affect an existing system. The issue is not only where the tank sits. Initial and duplicate disposal areas, setbacks and the proposed use of the land may matter.
For example, imagine an otherwise appealing Cunningham home where you hope to add a bedroom and a detached workshop. Treat those as two specific questions: is the wastewater system suitable for the changed use, and does the proposed workshop interfere with the approved system or reserved area? This is a hypothetical planning example, not a determination that either project can be approved.
TDEC groundwater-protection services and modification applications →
Septic approval is only one layer. Building permits, zoning, setbacks, easements, drainage and any private restrictions require their own checks. Confirm the correct building jurisdiction for the parcel; do not assume every Sango mailing address follows the same process.
04 · TAKE A SHORT LIST TO THE RIGHT PEOPLE
Five questions before the land becomes part of your plan
- What wastewater service does this exact home use? Confirm the provider or onsite arrangement.
- Do the available records match the current home? Note the file, approval information and any changes that need explanation.
- What does the system evaluation cover? Identify unresolved condition questions and who can answer them.
- Where are the approved and reserved areas? Ask how to establish their locations before planning work.
- Would my specific project require approval or modification? Describe the actual bedroom, pool or building idea rather than asking only whether the lot is large enough.
Your next step
Bring the property's address, the available file and one clear description of what you want the home and land to do. We can help organize the questions, while TDEC, the responsible local department and qualified professionals determine the answers in their specialties.
Keep exploring: Cunningham's land-and-services guide, Sango area guide and the homebuying due-diligence workbook. For adjoining land, use the parcel and zoning research steps.
Sources: Montgomery County Building & Codes permit guidance and linked TDEC records, FAQs and groundwater-protection services above. Educational planning information, not engineering, legal or inspection advice. No individual system, permit or proposed project was evaluated.