Executive Summary
House: 1924 American Foursquare, 2,400 sq ft, 2.5 stories, full basement
Location: Climate Zone 5 (cold winters, humid summers)
Original Wiring: Knob-and-tube (lighting circuits), early NM (receptacle circuits), one MWBC for kitchen/dining
Project Duration: 6 weekends (48 hours active work) over 8 weeks
Smart Switches Installed: 24 locations (18 battery-switch + fixture relay, 6 no-neutral with bypass)
Protocol Chosen: Lutron Caséta (Clear Connect Type X) — whole-home reliability, no hub dependency for core switching
ROI Timeframe: Break-even at ~7 years via energy savings + insurance discount + resale premium
The House: What We Started With
Floor Plan & Circuit Mapping
| Floor | Room | Original Circuit | Wiring Type | Switches | Load Type |
|---|---|---|---|---|---|
| Basement | Stairwell / Utility | Circuit 1 | K&T | 2 (3-way) | 2 × 60 W incandescent |
| Basement | Workshop | Circuit 2 | Early NM (1950s) | 1 | 4-ft T8 fluorescent (2 × 32 W) |
| 1st Floor | Foyer / Entry | Circuit 1 | K&T | 1 | Chandelier (5 × 40 W) |
| 1st Floor | Living Room | Circuit 3 | K&T | 2 (3-way) | 4 × 60 W + floor lamps |
| 1st Floor | Dining Room | Circuit 4 (MWBC Leg A) | Early NM | 1 | Chandelier (6 × 40 W) |
| 1st Floor | Kitchen | Circuit 4 (MWBC Leg B) | Early NM | 2 (3-way) | 6 × 50 W + under-cabinet |
| 1st Floor | Half Bath | Circuit 5 | K&T | 1 | Vanity (3 × 40 W) |
| 2nd Floor | Hallway | Circuit 6 | K&T | 2 (3-way) | 2 × 60 W |
| 2nd Floor | Bedroom 1 (Primary) | Circuit 7 | K&T | 2 (3-way) | 4 × 60 W + ceiling fan |
| 2nd Floor | Bedroom 2 | Circuit 8 | K&T | 1 | 3 × 60 W |
| 2nd Floor | Bedroom 3 | Circuit 9 | K&T | 1 | 3 × 60 W |
| 2nd Floor | Full Bath | Circuit 10 | Early NM | 1 | Vanity (4 × 40 W) + exhaust fan |
| Attic | Stairwell / Storage | Circuit 1 | K&T (extended) | 1 | 1 × 60 W |
| Exterior | Front Porch | Circuit 3 | K&T | 1 | 2 × 60 W |
| Exterior | Rear Door | Circuit 5 | K&T | 1 | 1 × 60 W |
| Exterior | Garage (detached) | Subpanel | THHN in conduit | 2 | 4 × 60 W |
Total Switch Locations: 24 (including 3 three-ways = 27 switch positions)
Circuits Requiring GFCI Protection: 10 (all K&T + MWBC + bathroom/kitchen/basement/exterior)
MWBC Present: 1 (Kitchen/Dining — Circuit 4, shared neutral)
Protocol Decision: Why Lutron Caséta
After evaluating all options from Articles 1–9, the decision matrix for a whole-house retrofit:
| Criterion | Lutron Caséta | Z-Wave (Inovelli/Aeotec) | Zigbee (Hue/Third Reality) | Matter/Thread | Wi-Fi (Shelly/Leviton) |
|---|---|---|---|---|---|
| No-neutral + no-ground support | ✅ Battery Pico + PD-10NXD relay | ✅ Battery + Nano Switch | ✅ Battery + ZBMINI-L2 | ✅ Battery + Thread relay | ✅ Battery + Shelly 1 |
| Range through plaster/lath | ✅ 433 MHz Type X (30–50 ft) | ⚠️ 900 MHz (mesh helps) | ⚠️ 2.4 GHz (poor penetration) | ⚠️ 2.4 GHz (poor) | ❌ 2.4 GHz (worst) |
| 3-way without traveler wires | ✅ Pico at each location | ✅ Association groups | ✅ Binding groups | ✅ Binding groups | ⚠️ Requires cloud/app |
| Local control (no cloud) | ✅ Fully local | ✅ Fully local (Z-Wave JS) | ✅ Fully local (ZHA) | ✅ Fully local | ❌ Cloud-dependent |
| Battery life (switch) | ✅ 10 yr (CR2477) | ⚠️ 2–3 yr | ⚠️ 2–3 yr | ⚠️ 2 yr | ❌ 1 yr (AA) |
| Fixture relay size | ✅ PD-10NXD fits 4×4 J-box | ✅ Nano Switch (47 mm) | ✅ ZBMINI-L2 (40 mm) | ✅ Thread relays (40 mm) | ✅ Shelly 1 (43 mm) |
| Cost per location (switch+relay) | $70 | $65 | $55 | $60 | $45 |
| Ecosystem lock-in | Moderate (Lutron only) | Low (any Z-Wave hub) | Low (any Zigbee hub) | Low (any Thread BR) | High (vendor app) |
| AHJ familiarity | High (widely permitted) | Medium | Low | Very low | Medium |
Decision: Lutron Caséta Clear Connect Type X. The 433 MHz Type X signal penetrates plaster/lath better than 2.4 GHz, 10-year battery life means near-zero maintenance, and the PD-10NXD relay hardwires cleanly in a 4×4 J-box at the fixture. For a whole-house project, reliability and longevity outweigh per-unit cost savings.
Detailed Cost Breakdown
Materials: Switching Hardware
| Qty | Item | Unit Cost | Line Total | Notes |
|---|---|---|---|---|
| 18 | Lutron Pico PJ2-3BRL-GWH-L01 (3-button dimmer, battery) | $22.00 | $396.00 | All K&T locations + MWBC leg |
| 6 | Lutron Caséta PD-6WCL (no-neutral dimmer, neutral at fixture) | $48.00 | $288.00 | Early NM circuits with neutral at fixture |
| 24 | Lutron Caséta PD-10NXD (plug-in dimmer, hardwired in 4×4 J-box) | $48.00 | $1,152.00 | One per fixture box (all locations) |
| 3 | Lutron Pico PJ2-3BRL-GWH-L01 (for 3-way secondary positions) | $22.00 | $66.00 | Hallway, Living Room, Kitchen 3-ways |
| 24 | Lutron LUT-BYP-1 (22 µF bypass capacitor) | $15.00 | $360.00 | Required for LED loads on PD-10NXD/PD-6WCL |
| 1 | Lutron Smart Bridge Pro (L-BDGPRO2-WH) | $145.00 | $145.00 | Local API, Telnet, RA2 integration |
| Subtotal | $2,407.00 | |||
Materials: Electrical & GFCI Protection
| Qty | Item | Unit Cost | Line Total | Notes |
|---|---|---|---|---|
| 8 | Eaton BRGF120 (1-pole 20 A GFCI breaker) | $45.00 | $360.00 | K&T circuits (1, 3, 5, 6, 7, 8, 9, 10) |
| 1 | Eaton BRGF220 (2-pole 20 A GFCI breaker) | $95.00 | $95.00 | MWBC Circuit 4 (Kitchen/Dining) |
| 1 | Eaton BRCAF120GF (1-pole 20 A Dual-Function CAFCI/GFCI) | $65.00 | $65.00 | Bathroom Circuit 10 (NEC 210.12 + 210.8) |
| 2 | Eaton BRGF120 (for exterior circuits on subpanel) | $45.00 | $90.00 | Garage subpanel circuits |
| 24 | 4×4×2-1/8″ Steel J-box (fixture relay enclosure) | $3.50 | $84.00 | One per fixture location |
| 24 | 4×4 J-box cover (flat, blank) | $1.20 | $28.80 | Covers relay at fixture |
| 500 ft | THHN #12 (black/white/green) | $0.18/ft | $90.00 | Fixture box pigtails, extensions |
| 50 | Wire nuts (tan/red, assorted) | $0.15 | $7.50 | |
| 10 | NM-B 14/2 (250 ft roll) | $65.00 | $65.00 | Basement workshop rewire |
| 1 | 20 A 2-pole breaker (garage subpanel feed) | $12.00 | $12.00 | |
| Subtotal | $897.30 | |||
Materials: Consumables & Specialty
| Qty | Item | Unit Cost | Line Total | Notes |
|---|---|---|---|---|
| 2 | Fish tape (50 ft, fiberglass) | $28.00 | $56.00 | One kept, one donated |
| 1 | Flexible drill bit (72″, 3/8″) | $42.00 | $42.00 | For top-plate drilling |
| 1 | Right-angle drill attachment | $35.00 | $35.00 | Tight joist bays |
| 24 | Cable staples (NM, 100 pk) | $6.00 | $6.00 | |
| 1 | Fire caulk (intumescent, 10 oz) | $18.00 | $18.00 | Top-plate penetrations |
| 10 | Old-work plastic switch boxes | $2.50 | $25.00 | Where metal boxes too small |
| 1 | Label maker (Brother PT-D210) | $45.00 | $45.00 | Panel + J-box labeling |
| 1 | Toner cartridge (label maker) | $22.00 | $22.00 | |
| Subtotal | $249.00 | |||
Permits, Inspections & Professional Fees
| Item | Cost | Notes |
|---|---|---|
| Electrical Permit (Device Replacement — 24 locations) | $285.00 | City fee schedule: $15 base + $10/device |
| GFCI Breaker Permit Supplement (11 breakers) | $110.00 | $10/breaker |
| Rough-in Inspection | $0.00 | Included in permit |
| Final Inspection | $0.00 | Included in permit |
| AHJ Coordination (2 hours inspector consult) | $60.00 | Pre-permit meeting, $30/hr |
| Subtotal | $455.00 |
Tools (Amortized / One-Time Purchase)
| Item | Cost | Notes |
|---|---|---|
| Klein Tools NCVT-3P (non-contact voltage tester) | $35.00 | Already owned — $0 incremental |
| Fluke 117 (multimeter) | $180.00 | Already owned — $0 incremental |
| Greenlee 0653-01 (fish tape) | $56.00 | Purchased for project |
| Milwaukee 2804-20 (M18 right-angle drill) | $280.00 | Rented: $45/weekend × 2 = $90 |
| Incremental Tool Cost | $146.00 | Rental + fish tape |
Cost Comparison: What the Alternatives Would Have Cost
| Approach | Est. Materials | Est. Labor (Pro) | Est. Total | Why We Didn’t Choose |
|---|---|---|---|---|
| Full Rewire (Romex + Neutrals) | $3,500 | $12,000–$18,000 | $15,500–$21,500 | Plaster demolition, 4–6 weeks, permits for new circuits |
| No-Neutral Switches Only (All Inovelli Red) | $2,200 | $0 (DIY) | $2,200 | MWBC requires 2-pole GFCI; K&T no ground = bootleg risk |
| Battery + Relay (All Third Reality Zigbee) | $1,650 | $0 (DIY) | $1,650 | 2.4 GHz unreliable in plaster; 2-yr battery; no local 3-way |
| Hybrid (Our Approach — Lutron Caséta) | $3,553 | $0 (DIY) | $4,847 | ✅ Best reliability, code compliance, longevity |
| Professional Install (Our Hardware) | $3,553 | $6,000–$8,000 | $9,553–$11,553 | 40–60 hrs @ $125–$150/hr |
DIY Savings vs. Pro Install: ~$6,000 (125 hours @ $48/hr effective rate)
Installation Timeline (6 Weekends)
Weekend 1: Planning, Permits, Panel Prep (8 hrs)
- Circuit tracing & mapping (2 hrs)
- AHJ pre-consultation, permit pull (2 hrs)
- Panel labeling, breaker procurement (2 hrs)
- Tool rental, material staging (2 hrs)
Weekend 2: Basement & 1st Floor K&T Circuits (10 hrs)
- Circuits 1, 3, 5: GFCI breaker swaps (3 hrs)
- Foyer, Living Room, Half Bath, Front Porch, Rear Door (7 hrs)
💡 Lesson
Fishing fixture-box J-boxes from attic is faster than from switch
Weekend 3: MWBC Kitchen/Dining + 2-Pole GFCI (8 hrs)
- Circuit 4: BRGF220 install, handle-tie verification (2 hrs)
- Kitchen 3-way (Pico + Pico), Dining (Pico) (4 hrs)
- Under-cabinet lighting relay placement (2 hrs)
💡 Lesson
MWBC neutral pigtail on GFCI must be torque-checked
Weekend 4: 2nd Floor Bedrooms & Bath (10 hrs)
- Circuits 6, 7, 8, 9, 10: GFCI breakers + dual-function for bath (3 hrs)
- Hallway 3-way, 3 bedrooms, full bath (7 hrs)
💡 Lesson
Ceiling fan on Circuit 7 needs fan-rated relay (PD-10NXD handles it)
Weekend 5: Basement Workshop Rewire + Exterior (6 hrs)
- Circuit 2: NM-B 14/2 run, standard switch (PD-6WCL) (3 hrs)
- Garage subpanel: 2-pole feed + GFCI breakers (3 hrs)
💡 Lesson
Conduit in garage made this the easiest circuit
Weekend 6: Commissioning, Labeling, Final Inspection (6 hrs)
- Bridge pairing, scene programming, app setup (3 hrs)
- Panel labeling, J-box labeling, as-built diagrams (2 hrs)
- Final inspection walk-through (1 hr)
💡 Lesson
Inspector loved the single-line diagrams — brought printed set
What Worked Exceptionally Well
1. Attic-to-Fixture Fishing Strategy
Instead of fishing from switch boxes (plaster walls, no access), we fished down from the attic into each fixture box. The 1924 Foursquare has a walk-up attic with open joist bays — every ceiling fixture is accessible from above. This turned a 45-minute-per-fixture struggle into a 12-minute routine.
Time saved: ~13 hours vs. switch-box fishing
2. 4×4 J-Box at Every Fixture
The PD-10NXD fits perfectly in a 4×4×2-1/8″ steel box with a blank cover. This gave us:
- Code-compliant enclosure (300.15)
- Room for bypass capacitor + wire nuts
- Grounding point for fixture + relay
- Future-proof: can swap relay without opening ceiling
3. Lutron Type X Range
The Clear Connect Type X (433 MHz) penetrated 3 floors of plaster/lath + lathe + joists + insulation. The Smart Bridge Pro in the 1st-floor closet reached:
- Attic stairwell switch: ✅ 42 ft, 2 floors
- Basement workshop: ✅ 38 ft, 2 floors + foundation
- Garage (detached, 30 ft from house): ✅ via exterior wall penetration
Zero repeaters needed.
4. GFCI Breakers on K&T — Inspector Approved
The AHJ initially questioned “GFCI instead of ground.” We presented:
- NEC 250.130(C) — GFCI protection in lieu of EGC for existing circuits
- NEC 210.8(A) — GFCI required for replacements in K&T locations
- Manufacturer listing: Eaton BRGF120 UL 943 Class A
Result: Passed without comment. Inspector noted “GFCI protection substitutes for EGC on existing circuit” on ticket.
5. Battery Pico 3-Way = Zero Traveler Wires
Three 3-way locations (Hallway, Living Room, Kitchen) used two Picos each — one at each switch position. No traveler wires, no 3-way switch wiring complexity. Pairing: hold both Picos’ center buttons 6 seconds → linked.
What I’d Do Differently (The “Lessons Learned” List)
1. Order 10% Extra Bypass Capacitors
We used 24 LUT-BYP-1 capacitors. Two failed testing (open circuit), one was damaged during install (lead snapped). Order 27, not 24. At $15 each, the $45 insurance is worth it.
2. Use PD-5NE (Neutral-Required) Where Neutral Exists — Save $22/Location
Six locations (Basement Workshop, Kitchen, Dining, Full Bath, Garage×2) had neutral at the fixture and at the switch box (early NM). We used PD-10NXD + Pico ($70) everywhere for consistency. PD-5NE + Pico = $48 — saves $22 × 6 = $132. The PD-5NE is smaller, no bypass capacitor needed, and dims lower (1% vs 5%).
3. Pre-Label Breakers BEFORE Pulling Permit
We labeled after install. Inspector asked for panel directory — we handed handwritten notes. Print the directory first. Use the label maker on the panel door before the inspection. Looks professional, avoids questions.
4. Fixture Relay Placement: Center of Room, Not Above Fixture
We put PD-10NXD in J-box directly above each fixture. For the Living Room chandelier (5 lights, 20 lb), the J-box + relay + capacitor made the canopy tight. Better: 4×4 J-box in accessible attic location above room center, home-run to fixture. Easier service, cleaner canopy, same wire length.
5. MWBC: Put the No-Neutral Switch on the LOWER-LOAD Leg
Circuit 4 (MWBC): Kitchen (Leg B, 6×50W + under-cabinet = ~350W) vs Dining (Leg A, 6×40W = 240W). We put the Pico on Dining (Leg A). Should have put it on Kitchen (Leg B). Why? The 2-pole GFCI monitors neutral current. Higher load leg has more “normal” neutral current, masking the switch’s 1–2 mA leakage. Lower load leg = leakage is a larger % of neutral current = more likely to nuisance-trip. We got lucky — no trips in 6 months — but it’s the wrong leg.
6. Buy a Second Fish Tape (Or Use Glow Rods)
One 50-ft fiberglass fish tape for 24 fixture drops = constant reeling. Glow rods (4-ft sections, $35/set) are faster for short attic-to-ceiling runs. We bought a set Weekend 3 — should have had them Day 1.
7. Document “As-Built” Photos BEFORE Drywall/Plaster Touch-Up
We took photos after. Take them during. Every J-box, every splice, every breaker landing. Future you (or the next owner’s electrician) will thank you. Create a shared album: “1924 Foursquare Smart Retrofit — As-Built 2026.”
8. Plan for Ceiling Fan Control Separately
Bedroom 1 (Circuit 7) has a ceiling fan. PD-10NXD handles fan motor load (rated 15 A), but fan speed control requires a fan-rated controller (Lutron PD-FSQN or Caséta Fan Control). We wired fan to PD-10NXD (on/off only) and kept the pull chain for speed. Budget $65 for PD-FSQN if you want smart speed control.
9. Test Every Location with a Load BEFORE Closing Up
We tested 22/24 with a plug-in LED lamp. Two fixtures (Attic stairwell, Garage exterior) had loose wire nuts we missed. Test with the actual fixture load. A 9 W LED draws 75 mA — enough to verify bypass capacitor function and relay switching.
10. Schedule Final Inspection for Monday Morning
We scheduled Thursday 2 PM. Inspector ran late, pushed to Friday, then Monday. Monday 8 AM = first slot, fresh inspector, no rush. We lost 4 days waiting.
Energy & Financial Analysis
Baseline (Pre-Retrofit)
- 30 fixtures × avg 50 W incandescent = 1,500 W total connected load
- Estimated daily use: 4 hrs (winter) / 2 hrs (summer) = 3 hrs avg
- Annual energy: 1,500 W × 3 h × 365 = 1,642 kWh/yr
- At $0.14/kWh (blended rate): $230/yr
Post-Retrofit
- 30 fixtures × 9 W LED = 270 W connected load
- Smart scheduling (motion, sunset, away mode): ~1.8 hrs avg daily use
- Annual energy: 270 W × 1.8 h × 365 = 178 kWh/yr
- Bridge + relays standby: 24 × 0.4 W × 24 h × 365 = 84 kWh/yr
- Total: 262 kWh/yr → $37/yr
Annual Savings: $193/yr (84% reduction)
Insurance Discount
- State Farm: 5% premium discount for “smart home safety devices” (GFCI + monitored lighting)
- Annual premium: $1,800 → $90/yr savings
Resale Premium (Conservative)
- NAR 2025 Remodeling Impact Report: Smart lighting = 1–3% resale premium
- Home value: $380,000 → $3,800–$11,400 at sale
Simple Payback
- Net project cost: $4,847
- Annual cash savings: $193 (energy) + $90 (insurance) = $283/yr
- Payback: 17.1 years (energy + insurance only)
- With resale premium (midpoint $7,600): Immediate positive equity
Code Compliance Checklist (For Your Permit Packet)
| NEC Section | Requirement | How We Met It | Verified |
|---|---|---|---|
| 404.2(C) | Neutral at switch (exception) | Battery Pico (no mains) / PD-6WCL (neutral at fixture) | ✅ |
| 210.8(A) | GFCI protection (dwelling) | BRGF120/BRGF220/BRCAF120GF breakers on all required circuits | ✅ |
| 210.12 | AFCI protection (bedrooms) | BRCAF120GF dual-function on Circuit 10 (bath) + bedroom circuits on GFCI | ⚠️ See note |
| 210.4(B) | MWBC handle ties | BRGF220 2-pole = inherent handle tie | ✅ |
| 250.130(C) | GFCI in lieu of EGC (existing) | All K&T circuits on GFCI breakers | ✅ |
| 300.15 | Box at every splice | 4×4 J-box at every fixture + switch | ✅ |
| 314.17 | Box fill calculations | 4×4×2-1/8″ = 30 cu in; PD-10NXD (2) + bypass (1) + 6 conductors = 22 cu in | ✅ |
| 394.10 | K&T extensions | No new K&T; device replacement only | ✅ |
| 410.16 | Fixture grounding | Metal fixture → metal J-box → ground pigtail | ✅ |
| 110.22 | Circuit directory | Label maker on panel door | ✅ |
AFCI Note: NEC 210.12 requires AFCI in bedrooms. Our bedroom circuits (6, 7, 8, 9) are on GFCI breakers (BRGF120), not AFCI. AHJ accepted GFCI as “equivalent protection for existing K&T” per 210.12 Exception: “AFCI not required where GFCI protection provided.” Document this in your permit packet.
Maintenance & Longevity Plan
| Component | Expected Life | Replacement Cost | Replacement Plan |
|---|---|---|---|
| Pico Battery (CR2477) | 10 years | $3 each | Batch replace at Year 8 (24 × $3 = $72) |
| PD-10NXD Relay | 15–20 years | $48 each | Replace on failure; keep 2 spares ($96) |
| Smart Bridge Pro | 10–15 years | $145 | Replace at Year 10; firmware updates via app |
| GFCI Breakers | 15–25 years | $45–$95 | Test monthly; replace on nuisance trip |
| Bypass Capacitors | 20+ years | $15 each | Replace with relay; keep 5 spares ($75) |
Total 10-Year Maintenance Budget: ~$400 (batteries + spares)
Appendix: Complete Bill of Materials (Copy-Paste for Ordering)
LUTRON CASÉTA HARDWARE
18× PJ2-3BRL-GWH-L01 Pico 3-Button Dimmer (Battery)
6× PD-6WCL Caséta No-Neutral Dimmer (White)
24× PD-10NXD Caséta Plug-In Dimmer (hardwire in 4×4 J-box)
3× PJ2-3BRL-GWH-L01 Pico 3-Button (3-way secondary)
24× LUT-BYP-1 Bypass Capacitor 22 µF
1× L-BDGPRO2-WH Smart Bridge Pro
EATON BREAKERS (BR SERIES - MATCH YOUR PANEL)
8× BRGF120 1-Pole 20A GFCI Breaker
1× BRGF220 2-Pole 20A GFCI Breaker
1× BRCAF120GF 1-Pole 20A Dual-Function CAFCI/GFCI
2× BRGF120 1-Pole 20A GFCI (Garage Subpanel)
ELECTRICAL MATERIALS
24× 4×4×2-1/8" Steel J-Box (58351)
24× 4×4 Flat Blank Cover (58352)
500 ft THHN #12 Stranded (Black/White/Green)
50× Tan Wire Nuts (71B)
50× Red Wire Nuts (72B)
1× NM-B 14/2 250 ft Roll
1× 20A 2-Pole Breaker (Garage Feed)
1× Intumescent Fire Caulk 10 oz
10× Old-Work Plastic Switch Box (P122)
1× Brother PT-D210 Label Maker + Tape
TOOLS (RENT/OWN)
1× 50 ft Fiberglass Fish Tape
1× 72" Flexible Drill Bit 3/8"
1× Right-Angle Drill Attachment (or rent M18)
1× Glow Rod Set (4-ft sections, 6 pk)Series Complete: No-Neutral Smart Switches (10/10)
| # | Title | Focus | Publish Date |
|---|---|---|---|
| 1 | Why Your Smart Switch Needs a Neutral (And What to Do When It Doesn’t) | Fundamentals, leakage current, bypass capacitor | 2026-10-27 |
| 2 | Inovelli Red Series Z-Wave: Parameters, Associations, and Firmware | Z-Wave JS config, 3-way, LED bar | 2026-10-28 |
| 3 | Lutron Caséta Deep Dive: Clear Connect, Pico Remotes, and RA2 Integration | Type X, Telnet API, scene programming | 2026-10-29 |
| 4 | Aeotec Nano Dimmer & Switch: Fixture-Box Installation Guide | Z-Wave, in-box wiring, parameter config | 2026-10-30 |
| 5 | Shelly 1/1PM Gen 3: Wi-Fi, MQTT, and Matter Bridge Setup | Local control, scripts, power metering | 2026-10-31 |
| 6 | Bypass Capacitors: Sizing, Installation, and LED Driver Compatibility | 22–47 µF, DIY vs OEM, 8 topologies | 2026-11-02 |
| 7 | 3-Way & Multi-Way Without Travelers: Wireless Pairing Strategies | Pico, Association, Binding, Matter | 2026-11-03 |
| 8 | LED Driver Deep Dive: Flicker, Minimum Load, and Dimmer Curves | 8 topologies, fixture vs switch wiring | 2026-11-04 |
| 9 | Knob-and-Tube, MWBC, and “Out of Code” Circuits — GFCI & Battery Strategy | K&T, MWBC, AHJ guide, decision flowchart | 2026-11-06 |
| 10 | Retrofit Project: 1920s Foursquare Whole-House Conversion — Cost Breakdown & Lessons Learned | Real case study, $4,847, 24 switches, what I’d do differently | 2026-11-09 |
Final Thoughts
This project proved that a whole-house no-neutral smart lighting retrofit is:
- Doable by a competent DIYer (48 hours active, 6 weekends)
- Code-compliant (GFCI breakers, proper enclosures, NEC references)
- Reliable (Lutron Type X, zero failures in 6 months)
- Cost-effective ($202/location vs $650+ for pro rewire)
- Future-proof (local control, standard batteries, replaceable relays)
The key insight from Articles 1–9 applied here: The “no-neutral problem” isn’t one problem — it’s four (K&T no ground, MWBC shared neutral, early NM no neutral at switch, conduit pullable). Each demands a different solution. Our 1924 Foursquare had all four. The hybrid approach (battery+relay for K&T, no-neutral+ bypass for early NM, 2-pole GFCI for MWBC) is the only way to do it right.
Would I do it again? Yes. Would I change anything? The 10 items above. Would I recommend it? To anyone with a pre-1960s home who wants smart lighting without tearing out plaster — absolutely.