All help is appreciated 
This kind of thing happens to me with some frequency when Iâm working on bigger buildings. Typically, itâs just an issue with the scaffolding not reaching the next place where your workers need to access. Try looking around inside and outside the building for any unbuilt sections which are at least two bricks out of reach (e.g., a low wall two bricks off the ground with no scaffolding), and build some ladders manually.
There are very few building problems which canât be solved with more ladders. And if all else fails, you could open the console (ctrl + shift + c) and type âibâ while you have the building selected to finish it.
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Is that a mountain directly behind it? If it is, I found when I placed my buildings directly near a mountain or cliff, without proper access to the base of the cliff or the back of the building inhibits them from building further at times.
I looked around my building and couldnât find any obvious places that were unreachable so I think Iâm just gonna end up using ib. Does ib use up resources?
The house is 2 blocks from a lake, not a mountain.
Instant build uses no resource. Keep in mind that your villagers need 2 spaces around a building to place scaffolting and to get there. Additionally they need 1 more row for each block you build as overhang
After you commented I built a bigger area around the house and they still didnât start building. I have also build some ladders around the house and no luck 
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have you tryed to save the template and build it somewhere else?
I have made building directly against the terrain walls and they just make scaffolding inside the houses. once there is open space on the out side they start a new scaffold there.
and if you feel you wanne pay for the building just make a crate/urn and let it fill with the materials you need and use the âdestroyâ command on it.
When my builders stop building, I often can fix this problem by saving and restarting. Close out the program and go back in.
I have been avoiding 2 story buildings while I wait for the next big building update but I think it is worth a try. Also, make sure you donât have any resources lying on the ground. Some things want to be stored before they are used.
Let me know if you find a fix, I have a similar issue. Seems to be a A14-A15 issues.
I tried saving and reloading way too many times and it never did anything.
Yah I think Iâm just gonna build 2 story houses from now on.
I ended up just âinsta-buildingâ it through the cheats console cause I couldnât find a fix 
I guess thatâs kind of a fix though? It doesnât use resources but after messing around trying to fix it for 2+ hours I gave up 
Multi-story buildings are totally doable, without any real issues. This one is relatively complex and still managed to be built without any console commands⌠just a lot of manually placed ladders and babysitting.
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I am finding this error as well. However, mine is accompained by 2 error messages.
develop-2972 (x64)...onehearth/components/building/building_component.lua:154: attempt to index local 'entry' (a nil value)stack traceback:
[C]: ?
...onehearth/components/building/building_component.lua:154: in function 'get_dependencies'
.../fixture_fabricator/fixture_fabricator_component.lua:163: in function '_are_dependencies_satisfied'
.../fixture_fabricator/fixture_fabricator_component.lua:202: in function '_start_project'
.../fixture_fabricator/fixture_fabricator_component.lua:41: in function <.../fixture_fabricator/fixture_fabricator_component.lua:39>
and
develop-2972 (x64)c++ exception: lua runtime errorstack traceback:
There is plenty of room around all the buildings and terrain (4 spaces). I think an object went missing somewhere which made them unable to continue working.
Here is the building file:
File on github
I am having a similar issue, though I am on the latest version (A24 I believe) and the main issue is they are taking FOREVER to get to work. The issue is not that they are unhappy and thus refuse to work, nor are they busy with other things or missing materials. I seem to get this error after I begin making complex buildings or I get far enough in the game. The error message I am getting is as follows:
release-821 (x64)[M]
âŚhearth/components/scaffolding/scaffolding_region.lua:1092: attempt to index field â_scaffolding_regionâ (a nil value)
stack traceback:
radiant/modules/commons.lua:53: in function âreport_tracebackâ
radiant/modules/commons.lua:64: in function <radiant/modules/commons.lua:58>
âŚhearth/components/scaffolding/scaffolding_region.lua:1092: in function â_update_scaffolding_sizeâ
âŚhearth/components/scaffolding/scaffolding_region.lua:499: in function âfnâ
radiant/modules/events.lua:288: in function <radiant/modules/events.lua:285>
[C]: in function âxpcallâ
radiant/modules/commons.lua:73: in function âxpcallâ
radiant/modules/events.lua:285: in function âtriggerâ
radiant/modules/events.lua:375: in function <radiant/modules/events.lua:374>
[C]: in function âxpcallâ
radiant/modules/commons.lua:73: in function âxpcallâ
radiant/modules/events.lua:374: in function â_fire_async_triggersâ
radiant/modules/events.lua:452: in function â_updateâ
radiant/server.lua:67: in function <radiant/server.lua:64>
If someone has a fix, please let me know. The game is still playable, but it is really frustrating, I usually give up and just âibâ it after awhile. Thanks!
@Fawnzy23 Reading the error message, it looks like the scaffolding failed. The â_update_scaffolding_sizeâ makes it seem like they were supposed to build it higher and, for some reason, canât. I donât know if itâs manually fixable, but you might take a look around and see if thereâs some uneven scaffolding around the build.
Thanks, although this seems to also hold some difficulty over buildings that donât require scaffolding (roads), although eventually theyâll build it. Also, itâs been happening on several of my saves, modded and unmodded. If I were to destroy all the scaffolding on a specific building thatâs having issues, should they try restarting with the scaffolding? Or would that break it more?
I donât actually know. Thatâs one method I havenât tried. I would certainly save the game before attempting it.
It didnât really work please, lemme know if you find another fix 
thanks!