--- title: How do I Control the Units of My Building? The Units Layer  description: The unit layer is used to control, create and customize the units within a building. --- [Skip to content](https://support.testfit.io/knowledge/unit-editor#main-content) [![](https://support.testfit.io/hs-fs/hubfs/primary%20wordmark.png?width=150&height=113&name=primary%20wordmark.png)](https://testfit.io/?hsLang=en) Open main navigation Close main navigation - - [Contact us](https://support.testfit.io/knowledge/kb-tickets/new) [Contact us](https://support.testfit.io/knowledge/kb-tickets/new?hsLang=en) Welcome to the TestFit Knowledge Base - There are no suggestions because the search field is empty. 1. [TestFit Knowledge Base](https://support.testfit.io/knowledge?hsLang=en) 2. [Site Development](https://support.testfit.io/knowledge/site-development?hsLang=en) 3. [Housing - High Density & Gurban](https://support.testfit.io/knowledge/site-development?hsLang=en#housing-high-density-gurban) January 12, 2026 # How do I Control the Units of My Building? The Units Layer ## The units layer is used to create and customize units. ### **Dynamic Units:** All of the default presets utilize a *dynamic* unit type. This mean the individual units (studios, 1 beds, 2 beds, etc.) stretch to fill the footprint of the building. Additionally a target ***mix*** and ***unit average*** is used to solve the building layout. You can adjust the mix and size of the units as you need. Example: We asked our dynamic 2 bedroom units to be: - 1200 square feet - Consume 35% of the units of our building. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-02-53-26-4749-PM.png?width=670&height=554&name=image-png-Nov-21-2025-02-53-26-4749-PM.png) This resulted in an exact percentage of 35%, and units ranging from 1,077 square feet to 1,318 square feet with varying options between.  In the lower portion of the properties panel you can control global values of ***all*** the units in the building.   **Unit depth:** Controls the overall depth of all the units in the building. **Inside corners:** When toggled off: removes units from being placed on the inside of the building. Is often used when things like mechanical rooms or Back-of-House rooms need to be placed in corners. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-03-46-2205-PM.png?width=507&height=307&name=image-png-Nov-21-2025-03-03-46-2205-PM.png) **Bifurcate corners:** Bifurcates *all* the corner units of a building. **Corner spacing:** Controls additional distance on the inside corner units. **Inset depth:** controls the inset depth of inside corner balconies. **Dead ends:** Disables or enables the use of dead end units at the end of corridors.  ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-08-10-5185-PM.png?width=293&height=192&name=image-png-Nov-21-2025-03-08-10-5185-PM.png) **Balconies:** Enables/disables the placement of balconies on all units of the building. **Balcony width:**  Controls the width of all the buildings balconies. **Balcony depth:** Controls the depth of all the buildings balconies. **Balcony inset:** Controls the inset of all the buildings balconies except inside corners. **Balcony height:** Controls the height of all the buildings balconies. --- ### **Adjusting the parking ratio:** Select the ***Units*** layer and enter the parking ratio you require for each unit size: ![](https://support.testfit.io/hs-fs/hubfs/image-png-Jul-03-2025-07-34-17-4470-PM.png?width=349&height=620&name=image-png-Jul-03-2025-07-34-17-4470-PM.png) --- ### **Using a Unit Library / Kit of Parts:** If you have exact/specific unit sizes that you need to utilize within your building, you will need to apply a ***kit of parts*** and create the unit sizes. With the Units layer selected, click ***edit library*** and then ***convert to a kit of parts***. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Jan-12-2026-01-49-08-1403-PM.png?width=893&height=341&name=image-png-Jan-12-2026-01-49-08-1403-PM.png) You are now in the *unit library* and will see all of the existing units from the current solve. In the image below we notice the building contained 3 different size studios, 3 different size 1 beds, 3 different size 2 beds, 0 3 beds, an inside corner unit, an outside corner unit, and was solving with dead end units: ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-27-26-2255-PM.png?width=670&height=237&name=image-png-Nov-21-2025-03-27-26-2255-PM.png) If you only want one specific floor plan of each, right click on the extra units and click *remove*. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-28-57-8422-PM.png?width=227&height=205&name=image-png-Nov-21-2025-03-28-57-8422-PM.png) Eventually your kit of parts will look similar to this layout: ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-30-05-9155-PM.png?width=670&height=293&name=image-png-Nov-21-2025-03-30-05-9155-PM.png) Should we need an additional bedroom size, such as a 3 bedroom option, click the ***add unit***button from the *Inline Units* option in the left panel*.*   ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-32-02-2995-PM.png?width=670&height=579&name=image-png-Nov-21-2025-03-32-02-2995-PM.png) You will find yourself in the individual unit editor, make sure to change the name, adjust the category, and increase the bed count for accurate tabulation reporting ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-34-43-3458-PM.png?width=393&height=534&name=image-png-Nov-21-2025-03-34-43-3458-PM.png) You can now adjust the units depth, width, balcony location, additional balconies, bays, and resize/relocate the entry.  ![UnitEditor](https://support.testfit.io/hs-fs/hubfs/UnitEditor.gif?width=670&height=377&name=UnitEditor.gif)   This 3 bedroom unit will now always utilize this exact size. It is no longer dynamic. It will no longer stretch to fill the building footprint. Click ***back to library*** and repeat these edits to the remaining unit layouts by clicking on them in the library.  ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-42-18-1598-PM.png?width=489&height=244&name=image-png-Nov-21-2025-03-42-18-1598-PM.png) Once you've modified all of the units in the library, you can save it to your assets folder and apply it to future solves. Give the set of units a name and click ***save to cloud*** ***![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-48-47-1130-PM.png?width=670&height=300&name=image-png-Nov-21-2025-03-48-47-1130-PM.png)***   Click back to site to see your units applied to the building. You'll notice that the dynamic portion of the unit properties are gone and there is no longer a target *unit average*. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-51-53-5080-PM.png?width=670&height=431&name=image-png-Nov-21-2025-03-51-53-5080-PM.png)   --- ### **Definitions & Deeper Explanations** #### Default Library The following unit libraries come installed in TestFit. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-54-52-0099-PM.png?width=347&height=426&name=image-png-Nov-21-2025-03-54-52-0099-PM.png) - **Bays** - units with extended bays. - **Corridor** **ext** - instead of an outside corner unit, corridor will extend to the end of the building mass - **Default** - traditional units - **Hotel** - module based units - **Luxury** - **Standard** - Smallest units - **Suites** - Largest units - **Inset** - balcony will be inset - **Juliets** - 6 inch balcony - **Micro** - small units - **Modules** - units - **Student** - units for standard student housing - **Urban** - larger units for urban living --- ### **Library Settings definitions** ![](https://support.testfit.io/hs-fs/hubfs/image-png-Jan-12-2026-01-51-05-7737-PM.png?width=267&height=616&name=image-png-Jan-12-2026-01-51-05-7737-PM.png) - **Inline** **Units** - non corner or dead end unit - **Inside** **Corners** - corner units inside the building mass - **Outside** **Corners** - units located outside the building mass - **Dead** **End** **Units** - units located at the end of a corridor - **Max linear Flex** - a metric that allows TF to slightly flex the unit size to solve - **Min Angle** - the boundary where the inside and outside corner units begin - **Max Angle** - the boundary where the inside and outside corner units end - **S** - Studio - no bedrooms and one living space - **A** - One Bedroom – one bedroom and one living space - **B** - Two Bedroom – two bedrooms and one living space - **C** - Three Bedroom – three bedrooms and one living space - **\** - create a new unit category success --- ### **Library health** The possible linear unit configurations (inline unit score) estimates the percent of how likely TestFit will solve a corridor without allocated areas. ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-55-13-2517-PM.png?width=670&height=92&name=image-png-Nov-21-2025-03-55-13-2517-PM.png) --- ### **Input Panel** Make changes to the unit ![](https://support.testfit.io/hs-fs/hubfs/image-png-Nov-21-2025-03-57-50-5027-PM.png?width=295&height=714&name=image-png-Nov-21-2025-03-57-50-5027-PM.png) **Name** - **Category** - 1,2,3 bedroom - **Unit** **Width** - **Unit** **Depth** - **Bed** **Count** - **Color** #### Entry - **Location** - sets the entry to the Left, Center, or Right - **Offset** - sets the distance from the wall - **Width** - sets the width of the entryway **Balcony** - **Location** - sets the balcony to the Left, Center, or Right - **Offset** - sets the distance from the wall - **Width** - sets the width of the balcony - **Depth** - sets the depth of the balcony - **Inset** - sets the distance of the balcony inside the unit. #### Bay Interior space project out from the exterior of the building - **Location**- sets the bay to the Left, Center, or Right - **Offset** - sets the distance from the wall - **Width** - sets the width of the bay - **Depth** - sets the depth of the bay **Add** **Bay** - Adds a Bay **Add** **Balcony** - Adds a Balcony --- ### **Unit Editor Output** ![building unit editor output panel](https://support.testfit.io/hs-fs/hubfs/CS%20-%20Customer%20Success/CS%20-%20Knowledge%20Base/CS%20-%20Knowledge%20Base/Configurator/building%20unit%20editor%20output%20panel.jpg?width=670&height=92&name=building%20unit%20editor%20output%20panel.jpg) - **NRSF** - net rentable square footage - **Balcony** - balcony area - **Common** - common area created by the entry - **Demising** - total length of walls on the sides of the unit - **Internal** **Skin** - total length of walls adjacent to the common area - **External** **Skin** - total length of walls on the building facade - **Bedrooms** - number of bedrooms - **Bathrooms** - number of bathrooms --- ### **Attaching an underlay** 1. Select the unit you'd like to add a background image to 2. Hit the Add Background Image button 3. Find image you'd like to add 4. Scale the image from a known dimension 5. 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