When reviewing municipal records, I often come across a surprisingly common situation. A house has four bedrooms, but the septic system on file with the town was approved for only three. My client, the buyer, panics a little as this sounds like a big deal and a major impediment to closing. While it sounds like a major problem, it usually isn’t.
Here’s how this happens. A house gets built with a certain number of bedrooms, and the septic system is sized and approved to match. Years later, someone converts a home office into a bedroom or adds a room over the garage, which qualifies as a bedroom. The building permit gets pulled, the work gets a certificate of occupancy, and the house is now legally a four-bedroom home. All of this was done without upgrading the septic system because, in Connecticut, a health code provision allows you to, under certain circumstances, expand a residence without physically expanding the septic system.
When the bedroom count goes up, the town’s health department can ask for a B100A instead of a full septic upgrade. A B100A is a feasibility study showing there is a suitable site on the property to install a compliant replacement septic system for the increased bedroom count if the current septic system ever fails. Once that’s on file and approved, the town treats the capacity question as resolved, even though the physical septic system in the ground is only approved for the smaller bedroom count.
So when I’m reviewing a municipal search, and I see a bedroom increase without a matching septic upgrade, the first thing I look for is that B100A filing. If it’s there and approved, I generally don’t treat this as an open issue. The town already decided the property has a code-compliant area to handle a future failure and has allowed the homeowner to proceed without physically upgrading the system. If there’s no B100A and no other health department filing tied to the bedroom increase, then I want more information before closing. The lack of paperwork doesn’t automatically mean trouble, but it raises the question of whether the work was done without proper inquiry or authority.
If you’re buying a house where the septic approval does not match the actual bedroom count, here’s how I’d work through it. First, discuss the municipal search with your attorney and be on the lookout for a B100A, tied to any bedroom-adding permit. Second, if you don’t see one, ask your attorney to get written confirmation or information from the health department stating there is no required action on the owner’s part before you close. Third, use what you learn to decide whether this is worth a conversation with the seller or simply a fact to note and move on from.
The Bayer Bottom Line
- A B100A on file usually means the town already resolved the capacity question, even if the septic system itself wasn’t upgraded.
- Bedroom-adding renovations that outpace septic approvals are common in Connecticut and don’t automatically signal a defect.
- Check the municipal search for a B100A or other approval whenever the bedroom count changed after construction.
- The lack of a B100A on file is a reason to ask more questions.
—
This post is for informational purposes only and does not constitute legal advice. Laws vary and individual circumstances differ. Consult a licensed Connecticut attorney for guidance specific to your situation.
—