Your hydraulic elevator is 25 years old. The elevator company says it's time to modernize. You get two quotes. One is $150,000 to convert to MRL. One is $85,000 to modernize around the existing cylinder.
The company pushing the MRL conversion tells you hydraulic is old technology. The company pushing the retain-and-modernize path tells you MRLs are unproven. Both have financial incentive to sell you their preferred solution.
Here's the question they're not helping you answer: which path makes sense for your building? This is a $100,000+ decision. Here's how to make it.
The Decision Variable: Your Cylinder
Before you evaluate MRL versus hydraulic, you need to know what kind of cylinder you have. This is the single most important variable in the decision.
Single-bottom cylinders are older designs. They rely on a single welded bottom to contain hydraulic pressure. If that weld fails, the elevator freefalls. Single-bottom cylinders are no longer code-compliant for new installations or replacements. If your building has one and it's 30+ years old, you're sitting on a blowout risk.
Double-bottom cylinders are failsafe designs. If the primary seal fails, the secondary bottom prevents freefall. These are code-compliant and safer. If you have a double-bottom cylinder in good condition, retaining it is a viable option.
If you don't know which type you have, get an inspection before you make any decisions. Cylinder type determines the entire cost analysis. A building with a compromised single-bottom cylinder should strongly consider full MRL conversion. A building with a healthy double-bottom can often retain and modernize for significantly less.
Cylinders are buried underground to the depth of the elevator's travel height. A six-story building has a six-story cylinder. These cylinders hit water tables, experience decades of corrosion, and aren't easy to inspect without excavation. The risk is invisible until it's not.
The Cost Comparison
Here's what each path typically costs:
| Path | Cost Range | What's Included |
|---|---|---|
| Full MRL conversion | $120K-$400K | Complete replacement: machine, controller, car, doors, signals |
| Retain + modernize (no cylinder work) | $70K-$150K | New controller, doors, signals, car interior. Keep existing cylinder. |
| Cylinder replacement only | $80K-$100K | New double-bottom cylinder, excavation, installation |
| Hydraulic power unit replacement | $30K-$50K | New pump, tank, valves (common on aging hydraulic systems) |
The math changes based on cylinder condition. If your cylinder needs replacement anyway, that $80,000 to $100,000 excavation and install cost makes the MRL conversion look more attractive. Why spend $80K on a new cylinder when an extra $40K-$120K gets you a full MRL with modern performance?
If your cylinder is solid, the retain-and-modernize path saves $50,000 to $250,000. You're not replacing a working asset. You're upgrading the control systems around it.
For a full breakdown of modernization cost components, see our elevator modernization cost guide.
When to Go MRL
Consider MRL conversion when:
You have a single-bottom cylinder 30+ years old. The blowout risk alone justifies replacement. And if you're replacing the cylinder anyway, the cost delta to go MRL shrinks significantly.
Cylinder inspection shows damage or corrosion. Cracked welds, corrosion along seams, visible deterioration. These are signals that cylinder replacement is inevitable. Full MRL conversion may cost less than cylinder replacement plus subsequent controller and door modernization.
High-rise or high-traffic building. MRLs offer smoother acceleration, better speed control, and more comfortable rides. In high-traffic environments with frequent starts and stops, the performance difference matters.
Energy efficiency is a priority. MRLs consume less energy than hydraulic systems, especially in buildings where elevators run frequently. Over 20 years, the energy savings can partially offset the higher upfront cost.
But: Budget for a 20-year machine lifespan. The first MRLs installed in the early 2000s are now 25 years old. Common failure mode is machine seizure due to bearing wear. Machine replacements run $60,000 to $80,000. And many maintenance contracts exclude the machine entirely. For details on MRL machine risks, see our MRL failure mode analysis.
When to Retain Hydraulic
Consider retaining your hydraulic system when:
You have a double-bottom cylinder in good condition. If the cylinder passes inspection and shows no signs of degradation, you have a working asset. Modernizing the controller, doors, and signals around it extends the system's life by another 15-20 years at a fraction of MRL conversion cost.
Low-rise building (3-4 floors). Hydraulic elevators are proven technology for low-rise applications. Speed and ride quality differences between hydraulic and MRL matter less when travel distance is short. The cost premium for MRL conversion is harder to justify.
Budget constraints. If capital is limited and the cylinder is sound, retain-and-modernize delivers functional, code-compliant equipment for $70,000 to $150,000. That's $50,000 to $250,000 less than full MRL conversion.
Proven reliability for your use case. Hydraulic elevators have been in service for decades. The technology is well-understood. Parts are available. Technicians know how to service them. If your building's usage pattern (low to moderate traffic, short travel distance) fits hydraulic's strengths, there's limited upside to switching.
But: If your hydraulic power unit is nearing end of life, budget $30,000 to $50,000 for replacement. Older units often fail around the same time other components need modernization. Check the power unit's condition before committing to the retain path. For context on hydraulic system longevity, see our guide to hydraulic elevator lifespan.
The Compliance Gotcha
Regardless of which path you choose, controller replacement triggers building code compliance requirements.
Replacing the controller is classified as a "major building improvement." That classification forces other building systems to meet current code. You may need:
- New smoke detectors in locations that didn't require them under older code
- Machine room layout modifications to meet current clearance and ventilation standards
- Possible sprinkler system updates
This applies to both MRL conversion and retain-and-modernize. It's not unique to one path. Budget for it either way. Compliance costs can add $10,000 to $30,000 depending on your building's current state.
What Your Maintenance Contract Covers (Or Doesn't)
Check your existing maintenance contract. If your hydraulic power unit or machine is excluded from coverage, you're already exposed to $30,000 to $80,000 in parts risk.
Many Full Maintenance contracts exclude "major components." The hydraulic power unit qualifies. So does the traction machine if you go MRL. If your contract excludes these items, your coverage isn't as comprehensive as you thought.
Upload your contract to our Contract Scanner. We'll show you exactly what's covered, flag exclusions, and help you understand your real exposure before you commit $100,000+ to a modernization path.
Make the Decision Based on Data
Start with cylinder inspection. Single-bottom and compromised? MRL makes sense. Double-bottom and solid? Retain-and-modernize saves money.
Run the total cost over 20 years. Factor in compliance costs, power unit replacement (hydraulic), or machine replacement (MRL). Then decide based on your building's situation, not the sales pitch.