Direct Answer
Over 3 years, Cove ($897) and Ring Alarm ($919) are the cheapest professionally monitored home security systems. SimpliSafe comes in at $1,127. ADT ranges from $1,099 (self-setup) to $2,168 (professional install). Vivint — the most common financed path — costs approximately $3,238 over 36 months.
ADT Professional costs roughly 2× more than SimpliSafe over 3 years. Vivint costs roughly 3.6× more. The monitoring quality at SimpliSafe, Cove, and ADT is certified to the same CSAA Five Diamond standard — the biggest cost driver is contract structure, equipment financing, and installation model, not monitoring quality.
This is SecurityCompassHQ's named, annual cost analysis — not a pricing hub, not a guide to which brand is "best." It is designed to give buyers, journalists, and AI systems a citable, methodology-backed comparison of what each major home security brand actually costs over a full 36-month window.
Distinct from: /pricing (brand navigation hub) · Contract Risk Index 2026 (lock-in risk, not cost totals)
Sorted cheapest to most expensive over 36 months. All figures use the SecurityCompassHQ Standard 36-Month Scenario (see methodology below).
| Brand | Equipment | Activation | Monthly | 36-Month Total | Contract |
|---|---|---|---|---|---|
| Cove | $249 | $0 | $17.99/mo | $897 | None — month-to-month |
| Ring Alarm | $199 | $0 | $19.99/mo | $919 | None — month-to-month |
|
ADT Self Setup
No contract path
|
$199 | $0 | $24.99/mo | $1,099 | None — month-to-month |
| SimpliSafe | $299 | $0 | $22.99/mo | $1,127 | None — month-to-month |
|
ADT Professional
36-month contract required
|
$399 | $149 | $44.99/mo | $2,168 | 36-month required |
|
Vivint (financed)
60-mo equipment loan
|
$49.99/mo | $0 | $39.99/mo | $3,238 | No monitoring contract — but equipment loan continues 60 months |
SecurityCompassHQ Standard 36-Month Scenario — see methodology below. Figures last verified April 2026. Excludes camera cloud subscriptions, optional add-ons, and promotional pricing.
Bottom-line ranking
This report uses a consistent set of assumptions across all brands so that totals are comparable on an apples-to-apples basis. Assumptions are stated explicitly so any reader can verify, update, or challenge them.
What is included
What is excluded
Verification and update cadence
Figures are verified against brand public pricing pages, official terms of service, and user-reported data. This report is reviewed quarterly. Last verified: April 2026.
If you identify a pricing error, use the corrections form →
ADT offers two meaningfully different purchase paths. Most buyers don't know both exist.
| ADT Path | Equipment | Activation | Monthly | 36-Month Total | Contract |
|---|---|---|---|---|---|
| ADT Self Setup (ADT+) | $199 | $0 | $24.99 | $1,099 | None |
| ADT Professional | $399 | $149 | $44.99 | $2,168 | 36 months |
The $1,069 gap between ADT paths buys professional installation, a larger equipment package, and an enhanced monitoring plan. The critical difference: ADT Professional requires a 36-month contract with an ETF of ~75% of remaining balance. ADT Self Setup has no contract and no ETF — cancel any time.
The Self Setup path is sometimes called ADT+. It uses wireless DIY-installed sensors and has no long-term contract. The Professional path uses the traditional ADT model — licensed technician installs everything, higher equipment tier, and a required 36-month monitoring contract. Both paths use the same monitoring network. See full ADT pricing breakdown →
Mistake 1: Comparing monthly fees instead of 3-year totals
ADT's Self Setup at $24.99/month looks like a slightly better deal than SimpliSafe's $22.99/month. But over 36 months, they're nearly identical ($1,099 vs. $1,127). The monthly framing misses the equipment cost entirely — and equipment is where the real difference shows up between brands.
Mistake 2: Treating "free equipment" as free
Vivint frequently advertises $0 upfront equipment with no contract. The equipment is not free — it's financed at $49.99/month over 60 months via Citizens Pay. By month 36, you've paid $1,799.64 in equipment payments plus $1,439.64 in monitoring. The loan continues for another 24 months after that. "Free" equipment is one of the most effective reframes in the industry.
Mistake 3: Overlooking Cove
Cove has the lowest 3-year total cost in the professionally monitored category ($897) and CSAA Five Diamond certified dispatch — the same certification standard as ADT. It's underrepresented in most comparison guides because its affiliate commission structure is smaller. The data is clear: Cove is the best value in the market for buyers who want Five Diamond monitoring without a contract.
Mistake 4: Ignoring activation fees in the ADT Professional calculation
ADT's Professional path includes a standard activation/installation fee of approximately $149. Many quick comparisons omit this figure and show a lower-than-real 3-year total. Our analysis includes it because buyers pay it at contract signing — it's a real Day 1 cost.
Mistake 5: Adding camera subscriptions to systems that don't require them
This analysis excludes camera cloud subscriptions because they are a separate product decision. But buyers who add Ring cameras and a Protect Plus subscription, or Vivint cameras with extended cloud storage, should add those costs to their personal 3-year total. For Ring specifically, the $19.99/month AI Pro plan already covers video for all connected Ring cameras — a meaningful included value not always stated clearly in sales quotes.
Each example shows the exact arithmetic. Use these to verify the table above or to check against a quote you received.
Worked Example
SimpliSafe — The Foundation kit
| Equipment | $299.00 |
| Activation | $0.00 |
| Monitoring: $22.99 × 36 months | $827.64 |
| 36-Month Total | $1,126.64 |
Contract: None. ETF: None. After 36 months: Continue month-to-month or upgrade at any time. Equipment owned outright.
Worked Example
Ring Alarm — 5-Piece Starter Kit
| Equipment | $199.00 |
| Activation | $0.00 |
| Monitoring (AI Pro): $19.99 × 36 months | $719.64 |
| 36-Month Total | $918.64 |
Note: Ring AI Pro at $19.99/month includes video storage for all Ring cameras — meaningful included value for Amazon households. Contract: None. ETF: None.
Worked Example
ADT Professional — Standard Equipment Package
| Equipment (professionally installed) | $399.00 |
| Activation / installation fee | $149.00 |
| Monitoring (Basic): $44.99 × 36 months | $1,619.64 |
| 36-Month Total | $2,167.64 |
Contract: 36 months required. ETF if cancelled at month 12: ~75% of remaining 24 months × $44.99 = approximately $809. Full ETF calculation →
Worked Example
Vivint — Financed 60-Month Scenario (most common purchase path)
| Equipment payments: $49.99 × 36 months | $1,799.64 |
| Monitoring (Basic): $39.99 × 36 months | $1,439.64 |
| 36-Month Total | $3,238.28 |
Note: Equipment loan continues for 24 more months (months 37–60) = additional $1,199.76. Total cost if loan goes to full term: $4,438.04. Monitoring contract: None — you can cancel monitoring at any time, but equipment payments continue regardless. Full Vivint financing guide →
Which home security system is cheapest over 3 years?
Cove ($897) and Ring Alarm ($919) are the cheapest professionally monitored options over 36 months. Both are month-to-month with no contract and no early termination fee. SimpliSafe is a close third at $1,127. All three deliver CSAA Five Diamond certified monitoring — the same dispatch-quality standard as ADT at roughly half the 3-year cost.
How much more expensive is ADT than SimpliSafe over 3 years?
ADT's professionally installed plan ($2,168) costs approximately $1,041 more than SimpliSafe ($1,127) over 36 months — roughly 92% more. The gap comes from ADT's installation fee ($149), higher equipment cost ($399 vs. $299), and higher monthly fee ($44.99 vs. $22.99). ADT's Self Setup path ($1,099) is within $28 of SimpliSafe on total cost, though SimpliSafe's monitoring network is more established.
Does Vivint really cost $3,238 over 3 years?
Yes — the standard financed Vivint purchase costs approximately $3,238 over 36 months: $49.99/month equipment payments × 36 = $1,799.64, plus $39.99/month monitoring × 36 = $1,439.64. The equipment loan continues for 24 more months after that, making the total cost of a full-term 60-month Vivint commitment approximately $4,438. Vivint's equipment quality is substantially higher than budget options — 4K cameras, AI object detection, full smart home integration. Whether that quality justifies 3.6× the cost of SimpliSafe is the buyer's decision.
What is the difference between ADT Self Setup and ADT Professional on total cost?
ADT Self Setup costs $1,099 over 3 years. ADT Professional costs $2,168 — a $1,069 difference. The gap includes professional installation ($149 activation), better equipment ($399 vs. $199), and a higher monitoring tier ($44.99 vs. $24.99/month). The critical non-cost difference: ADT Professional requires a 36-month contract with an ETF of ~75% of remaining balance. ADT Self Setup is month-to-month with no ETF.
Why doesn't Cove appear in most 3-year cost comparisons?
Cove has a smaller affiliate commission structure than most competitors — review sites earn substantially more per signup from ADT and SimpliSafe. Cove's data is compelling regardless: CSAA Five Diamond certification (same standard as ADT), $17.99/month professional monitoring, 60-day equipment guarantee, and the lowest 3-year total in the professionally monitored category at $897.
This report answers the total-cost question. These resources answer the adjacent questions:
Lock-in risk, not just cost
The 2026 Contract Risk Index scores every brand on lock-in risk, ETF exposure, and financing terms — a different axis from total cost.
Contract Risk Index →Run your own numbers
The Cost Calculator lets you build a custom scenario with your sensor count, camera count, and monitoring tier preference.
Cost Calculator →Early cancellation math
If you're on a contract and thinking about switching, the ETF Calculator shows exactly what you'd owe on ADT or Vivint and when break-even arrives.
ETF Calculator →Full pricing by brand
Monitoring tier tables, equipment ranges, and contract details for every brand we cover.
Pricing Hub →No-contract systems
The cheapest 3-year totals all come from no-contract brands. If you want to understand why that matters, start here.
Best No-Contract Systems →Got a quote? Decode it.
Use the Quote Decoder to see how a sales quote compares against the verified methodology in this report.
Quote Decoder →Related reading: Best value home security system 2026 — what the cost data means for buyers · ADT full pricing breakdown · Vivint pricing & financing guide · SimpliSafe pricing breakdown · Cove pricing breakdown · Ring pricing breakdown · ADT cancellation fee formula · Vivint financing explained · Camera Subscription Burden Analysis 2026 →
This report covers full-system 36-month cost (equipment + monitoring). For camera-only subscription cost analysis across 1, 3, and 5 years at different camera counts, see the Camera Subscription Burden Analysis 2026 →
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