• Welcome to the new and improved Building Code Forum. We appreciate you being here and hope that you are getting the information that you need concerning all codes of the building trades. This is a free forum to the public due to the generosity of the Sawhorses, Corporate Supporters and Supporters who have upgraded their accounts. If you would like to have improved access to the forum please upgrade to Sawhorse by first logging in then clicking here: Upgrades

Going from Duplex to Triplex with Grandfathered Laws

John G

Registered User
Joined
Aug 3, 2019
Messages
2
Location
Broomfield CO
I am currently in the process of purchasing a duplex and am trying to evaluate wether or not I am able to add a dwelling unit by right. Obviously first thing Monday morning I'm going to have a discussion with someone in the zoning department about this but first wanted to see if anyone had experience with such a scenario.

Currently the property is zoned by the city as R5 High density Residential with a 20 unit acre cap. Property code on the City's record is listed as "dup/triplex land" and it is sitting on just over 1/6 acre of land (.176). The county was annexed in 2001 taking the land from Boulder County.

The only issue I'm seeing is that the minimum lot requirement is 10,000 sqft. Will this present a problem when applying for a building permit for a triplex? (The additional unit will be in the unfinished basement)


Broomfield County Zoning Laws: https://library.municode.com/co/broomfield/codes/municipal_code?nodeId=TIT17ZO_CH17-18HINSREDI
 

cda

Sawhorse 123
Joined
Oct 19, 2009
Messages
19,324
Location
Basement
Not into zoning, will let others speak to that.

Seems like you are not adding to the building size.

Do you know if fire sprinklers might be required??

How will people exit out of the basement?? is there a direct door to the outside?? or have to go up stairs??

And did you take into account each bedroom will either need a door directly to outside or window
 

fatboy

Administrator
Joined
Oct 17, 2009
Messages
6,077
Location
Northern CO
Right after you talk to the Zoning folks, if they green light you, your next stop needs to be the Building Department.......you might be adding fire sprinklers.
 

John G

Registered User
Joined
Aug 3, 2019
Messages
2
Location
Broomfield CO
At this stage I'm most concerned with wether or not it is feasible to even add an additional unit. Sprinklers, means of egress and the like can all be added later.
 

cda

Sawhorse 123
Joined
Oct 19, 2009
Messages
19,324
Location
Basement
Do you have parking for a couple more cars??

Remember what you are looking at is for brand new const.

You might be allowed since the building is there and you are not adding to it
 

ADAguy

Sawhorse
Joined
Sep 11, 2013
Messages
5,384
Location
California
At this stage I'm most concerned with wether or not it is feasible to even add an additional unit. Sprinklers, means of egress and the like can all be added later.
How much less than 10k is your lot? They will often allow if the difference is <5% or?
Any other triplex in the area?
 

jar546

*****istrator
Joined
Oct 16, 2009
Messages
8,027
Location
Palm Beach County Florida
At this stage I'm most concerned with wether or not it is feasible to even add an additional unit. Sprinklers, means of egress and the like can all be added later.

You may never visit this site again for follow-up but just in-case you do:
Although this is strictly a zoning issue at this time, you really may want to heed the advice and get more information about the building requirements. You may get the answer you want from zoning but then you have to comply with the building requirements which may not be feasible to you.
 

e hilton

Bronze Member
Joined
Jul 2, 2014
Messages
1,333
Location
Virginia
How much less than 10k is your lot? They will often allow if the difference is <5% or?
Any other triplex in the area?

He said 1/6 acre or 0.176 acre. That calcs to be 7,666 sf ... a bit more than 10%.
 
Top