Reddit mentions of GE Enbrighten Z-Wave Plus 1000-Watt Smart Dimmer, No Neutral Wire Required, Halogen/Incandescent Bulbs Only, Works with Alexa/Google Assistant, ZWave Hub Required, White & Light Almond, 14299

I would install generic Z-wave smart switches in all the rooms like this one:

https://www.amazon.com/dp/B07361Y54Z/ref=psdc_6291359011_t2_B01M1AHC3R

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That way all you need is a SmartThings hub and all the lighting in your house will be smart lights, ready to be controlled with Alexa or Google Home.

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When you sell the home, just unpair the switches from your SmartThings hub (or whatever other hub) and the next owner can pair them with their hub when they move in. You could use Wifi switches but I find those are harder to setup for the next owner, especially when there are many of them throughout the entire house

SmartThings Version 3 Hub (I have the Version 2 Hub...you will have to look around for this one):
https://www.amazon.com/Samsung-SmartThings-Generation-GP-U999SJVLGDA-Automation/dp/B07FJGGWJL/ref=sr_1_1_sspa?ie=UTF8&qid=1540989501&sr=8-1-spons&keywords=smartthings+hub+2nd+generation&psc=1

GE Z-Wave Plus On/Off Light Switch:
https://www.amazon.com/GE-Repeater-Required-Works-SmartThings-14291/dp/B01M1AHC3R/ref=sr_1_3?ie=UTF8&qid=1540989582&sr=8-3&keywords=z-wave+switch

GE Z-Wave Plus Dimmer Switch:
https://www.amazon.com/GE-Repeater-Required-Works-SmartThings-14291/dp/B07361Y54Z/ref=sr_1_3?ie=UTF8&qid=1540989582&sr=8-3&keywords=z-wave%2Bswitch&th=1

GE Add On Switch (if you have a 3-way or 4-way switch):
https://www.amazon.com/GE-Bluetooth-Wireless-STANDALONE-12723/dp/B00RKJS8MQ/ref=sr_1_3?ie=UTF8&qid=1540989718&sr=8-3&keywords=z-wave+add+on+switch

ZigBee Motion Sensors:
https://www.amazon.com/gp/product/B07F8ZHBLS/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

ZigBee Door Sensors:
https://www.amazon.com/gp/product/B07F956F3B/ref=oh_aui_detailpage_o01_s00?ie=UTF8&th=1

ZigBee Leak Sensors:
https://www.amazon.com/gp/product/B07F951JDP/ref=oh_aui_detailpage_o01_s00?ie=UTF8&th=1

ZigBee Outlet Plug (you will need to replicate your ZigBee mesh, I use to motion activate lamps, turn lamps on/off at sunset/sunrise, etc.):
https://www.amazon.com/gp/product/B07F96JB63/ref=oh_aui_detailpage_o01_s00?ie=UTF8&th=1

Z-Wave Thermostat:
https://www.amazon.com/gp/product/B005EJ7YO2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

ZigBee RGB Landscape RGB LED Strips:
https://www.amazon.com/gp/product/B00R1PB2ZY/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

ZigBee RGB Lightbulbs:
https://www.amazon.com/gp/product/B073ZBYXKQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Z-Wave Deadbolt:
https://www.amazon.com/Kwikset-SmartCode-Electronic-SmartThings-featuring/dp/B004F1B24I/ref=sr_1_12?s=hi&ie=UTF8&qid=1540990126&sr=1-12&keywords=z-wave+lock

Z-Wave Garage Door Opener:
https://www.amazon.com/GoControl-Linear-GD00Z-4-Z-Wave-Controller/dp/B00M75TEIU/ref=sr_1_4?s=hi&ie=UTF8&qid=1540990160&sr=1-4&keywords=z-wave+garage+door+opener

Sonos One Speakers (Great music, and talking through SmartThings):
https://www.amazon.com/gp/product/B074XN1LH3/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Amazon Echo Show (for Voice Control...an Echo Dot will work just fine too):
https://www.amazon.com/All-new-Echo-Show-2nd-Gen/dp/B077SXWSRP/ref=sr_1_1?s=electronics&ie=UTF8&qid=1540990254&sr=1-1&keywords=echo+show

That's about all I can think of at the moment.

If you are going to do this, do it in stages. Z-Wave and ZigBee are mesh networks...meaning that the reliability of the network gets much better the more devices you have. Also, with these mesh networks:

• Battery operated devices DO NOT reinforce the mesh
  
• The only devices that reinforce the mesh are devices that are always powered from the mains
  
  I see so many people complaining about how the Z-Wave or ZigBee devices don't work, when they are relying on too many battery operated devices.
  
  For Z-Wave devices, choose Z-Wave Plus over Z-Wave...it's the newest standard, and has much better range.
  
  In the US, Z-Wave operates in the 900 MHz spectrum and ZigBee in the 2.4 GHz spectrum. Personally, I "prefer" Z-Wave devices as there is a lot of "junk" in the 2.4 GHz spectrum right now. However, the ZigBee devices are operating reliably as I have a strong mesh setup (with non-battery operated devices).
  
  Two great application for the Leak Sensors:
  
  
• Near your hot water heater (when they go, they always leak)
  
• Under your A/C drip pan (if you have central air)
  
  Great applications for door open/close sensors:
  
  
• Turn closet lights on/off when the door opens or closes
  
• Turn on entry and hallway lights when an entry door opens, but only when it's dark (30 minutes before sunset or after sunrise)...turn off 1 minute later
  
• Notify me when my gun safe is opened
  
  Great Application for Motion Sensors
  
  
• Turn on outside ceiling fans (but only if the temp is above 72 degrees)
  
• Turn on lamps while motion is active when it's dark
  
  The motion sensors I linked above are the new ones...the magnetically mount. What's cool is that the magnet is in the sensor, and it's strong enough to attach the sensor to a dry wall screw (no need to mount the adapter bracket).

I wouldn't recommend WiFi smart switches. Maybe one or two, sure, but you should try to keep your WiFi devices to a minimum for best WiFi performance.

Look at getting a hub and z-wave switches/dimmers. GE makes some good ones, switch and dimmer. Z-wave devices form a mesh and talk to each other on a completely separate wireless band than WiFi, so it won't hurt your WiFi performance.

That model is the Z-Wave 300 series version, HERE is the Z-Wave Plus 500 Series updated model.

GE makes a high-load ZWave dimmer which doesn't require a neutral, though they say it's not for LED or CFL bulbs: https://www.amazon.com/GE-Repeater-Extender-SmartThings-14291/dp/B07361Y54Z/ref=sr_1_3

Well damn....pays to keep reading.

I was here

https://www.amazon.com/dp/B07361Y54Z/ref=twister_B07BC89LDF?_encoding=UTF8&psc=1

where they say "For Halogen and Incandescent bulbs - not compatible with LED and CFL bulbs. For LED and CFL bulbs, see GE Z-Wave Plus Smart Dimmer Switch 14294."

I apparently stopping reading at the first sentence. Oops!

That's common in older houses. The power line from the breaker box is ran to the fixture, and then a two-conductor line goes from the fixture to the switch. That puts the switch between the hot and the fixture, but has no neutral.

You have a few choices here.

One is to use a switch that doesn't need a neutral wire.
The Lutron Caseta line has a couple that don't need neutral.
On the Z-Wave side, a company called Inovelli has a dimmer switch that doesn't need neutral coming out in May but pre-orders are available. Their head guy is a Redditor- /u/inovelliusa
There's also a GE/Jasco Z-Wave dimmer that claims no neutral is required- the Jasco 14299. Spec sheet says it won't work with CFL or LED, incandescent only.

Two is to run a neutral wire to the switch box. Generally this is done from wherever the nearest outlet is.

Three is don't use the switch as a switch. Put something like a nano dimmer in the box above the fixture, and bypass the switch entirely. Put something like this over the wall switch, or alternatively you could use the line going to the switch just to feed power to a z-wave powered keypad like the Cooper scene controller.

The "power" in that picture is the black wire that comes in on the left, is connected to the white with "black tape" that goes into the middle switch. Your middle switch, which is your dimmer has power all the time to the top left terminal of the switch. That white wire with black tape is your power.

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You're problem isn't that you don't have power, its that you don't have a neutral and the zwave switchesthat you are talking about all require a neutral. You'd have to pull a new wire to those switch with a neutral to get the zwave switches to work.

With that said, you're over thinking this, all you need is a zwave switch that doesn't require a neutral + an accessory switch.

https://www.amazon.com/GE-Incandescent-Required-SmartThings-14299/dp/B07361Y54Z with this add on https://www.amazon.com/45610WB-Z-Wave-Add-Auxiliary-Switch/dp/B0080G4OJO?crid=33CK8GG8JZDUW&keywords=ge+add+on+switch+z-wave&qid=1540485670&s=Home+Improvement&sprefix=GE+Add+on+%2Ctools%2C283&sr=1-6&ref=sr_1_6

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You will keep dimming ability, eliminate the need to have a zwave relay in the light socket, and will work manually without the need of a hub online. You will have to use incandescent bulbs though.