Add-On Backyard Coop


$99 Shipping* SKU 135

info48Buy if you already own one Backyard Coop and you want to make a Duplex.


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  • Attaches to existing Backyard Coop to make a Duplex Backyard Coop
  • up to 12 hens with the two coops connected.
  • up to 15 hens with two coops connected and 1 run extension.
  • up top 20 hens with two coops and two run extensions.
  • More run extensions give more run space but does not increase capacity.


[toggle title_open=”Dimensions / Hen Capacity Chart” title_closed=”Dimensions / Hen Capacity Chart” hide=”yes” border=”no” style=”default” excerpt_length=”0″ read_more_text=”Read More” read_less_text=”Read Less” include_excerpt_html=”no”]
We calculate hen population based on ~4 ft² per bird run space (free range by Gov’t standards) adequate roost bar space, egg box space, and quantity and number of feed and water units. You add extra space because you’re being extra generous on space, or you’re adding room for extra hens in an optional configuration.

Up to this many hens…

6 ►Base Backyard Coop
10 ►1 or 2 run extensions
12 ►Duplex Add-On
15 ►Duplex Add-On & 1 Extension
20 ►Duplex Add-On & 2 Extensions

ESC or Click anywhere outside image to close...(click image to zoom)
See tabs below for more detailed product information.


[box type="alert" style="rounded"]Shipping Rate Notice: This accessory ships for free when purchased with a coop due to bulk rate shipping on packages. * Zone based per item rate calculated in cart starting from shown price.[/box]  

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SKU: 135 Categories: ,
Buy now, and this product ships 2-3 weeks.
Buy now, lock in your build slot...
2022 is presenting more labor and materials supply challenges and price increases than we have experienced in the past. We expect more price and backorder volatility this year. We build this product in weekly batches. Upon purchase, we will assign your order to a batch and lock in the price. Transit times after shipping are from 1-5 days depending on where you live. Orders are built in the sequence that they are received. We have fulfilled thousands of orders this way and are confident in our scheduling.

. Thank you in advance for your order!
Want to understand more? Read our policies terms and conditions.

Learn More Here

Compatibility Note
Please Note: We have customers who from time-to-time purchase our accessories to use with non Roost & Root products. Due to the custom nature of our accessories design and fabrication, we cannot warrant the suitability of their use outside their intended purpose.
Advanced Hen & Egg Chart

Hen Capacity Color Key: Bantam Sizes / Average Sizes / Large Breeds

Data Given In Format 


Egg Production

(per week)

Run Width x Length

(In feet rounded)

Run Space
(Feet squared)

Hen Capacity
(No Free Range Time)

Hen Capacity
(With Free Range Time)

Round Top Mobile Chicken Coop


16-24 | Same

4'x5' | 4'x10'

20ft² | 40ft²

6/4/2 6/4/2


Round Top Backyard Chickn Coop


24-36 | 36-48

5'x5' | 5'x10'

25ft² | 50ft²



Round Top Stand-up Chicken Coop


24-36 | Same

5'x6' | 5'x8'

30ft² | 40ft²



Round Top Chicken Loft

Chicken Loft

48-60 | n/a

9'x6' | n/a

54ft² | n/a

14/10/8 n/a

14/10/8 n/a

Round Top Walk-In Chicken Coop


60-72 | Up to 100

10'x8' | 15'x8'

80ft² | 120ft²

30/20/12 35/25/15

30/20/12 35/25/15

Full Detailed Version of This Chart