Overview: New Hampshire septic system construction approvals and constructed systems are based on predicted load from buildings as designed/built. If use of building is changing, building is being expanded, there is another building to connect, then appropriate changes are made to the septic systems following a New Hampshire construction approval  to reflect the updated load.  If there was no operational approval before, an operational approval will be written following a State inspection of the construction required by the update. This is process is required by New Hampshire law before adding load.  

Load change increases:

1. Adding a bedroom, or bedrooms
    

2. Adding a business in an existing residential house
    

3. Dividing a house into multiple separate living spaces – ie apartment conversion of a single family dwelling
    

4. Conversion of a part time seasonal dwelling to a full time year round dwelling.
    

5. Connecting a new outbuilding to an existing system.

Compliance with rules:

When load increase due to one of the above reasons occurs, State rules require existing septic systems be brought into compliance with current New Hampshire septic rules, but not necessarily replaced completely. There are variances granted in some, but not all, situations for permit updates. 

Contact Hogg Hill Design LLC to discuss changes to your existing building or property. We can advise you on how to permit or modify your existing permit, provide septic design and determine what is necessary.