Predictika · Curved stairlift quotes

An AI sales agent's curved stairlift quote, checked before it goes out

An AI sales agent prepares a quote for curved stairlifts: the model, the length of rail, the options, the user's weight and the total price it states. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the published Stannah pricing table and technical sheets and returns a verdict, every reason and the figures it computed.

Scope: Stannah curved stairlifts (260 Siena, 260 Sadler perch stairlift and Joya): rail length, options, user weight limits and the total price in pounds. See everything this validator covers

This validator models quotes for the Stannah 260 Siena, the 260 Sadler perch stairlift and the Joya, one configuration at a time, from the public Stannah stairlift pricing table (May 2026) and the Stannah 260 technical sheets, not just the scenarios shown below.

  • Price build-up — starting price per model, the included 6 m of rail and £300 for each extra metre, and the published option prices (alternative rail colour, landing stop, powered swivel, powered hinge, footrest fold button, faux leather or woven seat, harness and straps, heavy use charger and batteries, 2-way communicator). The total the quote states is compared with the computed total.
  • What each model offers — the powered hinge only on the 260 Siena; no powered swivel or upholstered seat on the 260 Sadler; Jet Black rail only on the Joya. Items the table lists as included carry no charge.
  • User weight — 21 stone limit on the curved models and 19 stone (120 kg) for the powered hinge; for the 260 Sadler and the Joya the table lists the limit as subject to confirmation, so a quote that has not been confirmed goes to a person.

Any curved stairlift quote for these three models that touches these rules is in scope — not only the scenarios pictured here. Not covered: straight stairlifts and other Stannah products, the home survey and any custom rail design, VAT, finance, service plans, and prices in other countries. Assumptions: the prices are the starting prices in a dealer-hosted copy of the pricing table, correct as of May 2026, and the real quote follows a survey; the rail is priced in whole metres; the 19 stone powered hinge limit is taken from the Stannah 260 technical sheet (120 kg); the quantity is the number of identical stairlifts, each with its own rail.

The AI sales agentBuilds the stairlift quote from the conversation and says it is ready.
Predictika validatorChecks every rule at once and returns the verdict, each finding, and the computed figures.

7 scenarios in 3 groups · each group runs from the agent’s first attempt to the outcome · click one to switch

What the agent proposes

The AI sales agent says

Illustrative agent statement. The validator receives the structured request below.

Proposing agent: AI sales agent (scripted)

Before sending, the agent must call Recorded run

Predictika validator


      

        
        
        
      

      
Waiting for the call.

      
    

  

  
  

    
Where rules-based CPQ gets it wrong
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Our assessment of what a typical rules-based CPQ (product rules, price rules and validation rules, as in Salesforce CPQ) does with the same cases. It is a judgment about effort and reliability, not a claim that nothing can be built.

    
What the validator caughtTypical rules-based CPQPredictika
Options that exist on one model and not on anotherOnly with care
A product rule per model and option; it works, but every new model or option adds rules to maintain, and included versus charged options need their own price lines.		Model, options and price are in one request and every unavailable option is listed with the others.
A weight limit that depends on the model and on one option (the powered hinge)Only with workarounds
Two limits, one general and one tied to an option, plus a user weight that is not a product attribute; rules end up spread across product and validation rule sets.		The weight is part of the request and both limits are checked on every call.
Rail priced per extra metre beyond the included lengthOnly with care
A summary or price rule has to compute the extra metres and keep the included length in step with the price table.		The extra metres and the price build-up are computed on every call.
A total the quote states that must match the price tableOnly with care
The stated total is free text or a manual field; a comparison has to be built and kept current.		The stated total travels with the quote and is compared with the computed total.
Limits that are only subject to confirmationOnly with workarounds
Approval routing is a separate flow that has to be kept in step with the product rules.		The quote comes back as needs approval with the reason, in the same answer as every other finding.

  

  

    
What this validator catches: findings from its test cases
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Every rule is checked on every call, in any order the choices arrive; one problem never hides another. Blocking findings stop the quote; approval findings need a person to sign off; everything else is computed.

    
1For this model the 21 stone limit is listed as subject to confirmation and it has not been confirmed for this user; a person should confirm it.
2The Joya rail comes in Jet Black only; there is no alternative rail colour.
3The 260 Sadler perch stairlift has no powered swivel option.
4The 260 Sadler perch stairlift has no faux leather or woven seat option.
5The powered hinge is offered only on the 260 Siena.
6The powered hinge is limited to 19 stone (120 kg); the user weighs 20 stone.
7The user weighs 22 stone; the curved stairlift models are limited to 21 stone.
8The quote has 0 stairlifts; at least 1 is needed.
9The quote states a total of £7,795; the published prices give £7,895.
10The quote states a total of £11,495; the published prices give £10,895.
11The powered hinge is limited to 19 stone (120 kg); the user weighs 22 stone.

  

  

    
Scenarios and results
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The recorded result of the validator for each scenario on this page: the request the AI agent sent, the verdict, and every finding, in the order they appear above.

    
1. Siena, powered hinge: Two Siena stairlifts with a powered hinge for a 20 stone user

    
The agent's request. Please quote two Stannah 260 Sienas with 9 metres of rail for a user who weighs 20 stone. Include a landing stop, a powered swivel, a powered hinge, a footrest fold button and harnesses and straps. The quote states a total of £19,290. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Powered hinge weight limit. The powered hinge is limited to 19 stone (120 kg); the user weighs 20 stone.
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2. Siena, powered hinge: The agent resubmits after fixing the errors

    
The agent's request. Please quote two Stannah 260 Sienas with 9 metres of rail for a user who weighs 20 stone. Include a landing stop, a powered swivel, a footrest fold button and harnesses and straps. The quote states a total of £17,590. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Order summary. 2 stairlifts at £8,795 each, £17,590 in total, 5 year warranty included, installation about 2 to 3 weeks.
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3. Sadler, options and weight limit: Two Sadler perch stairlifts with a powered swivel and an upholstered seat

    
The agent's request. Please quote two Stannah 260 Sadler perch stairlifts with 7 metres of rail for a user who weighs 16 stone. Include a landing stop, a powered swivel, a faux leather or woven seat, harnesses and straps, the heavy use charger and batteries and a 2-way communicator. The quote states a total of £19,390. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Powered swivel not available on the Sadler. The 260 Sadler perch stairlift has no powered swivel option.
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  • Upholstered seat not available on the Sadler. The 260 Sadler perch stairlift has no faux leather or woven seat option.
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  • Stated total does not match. The quote states a total of £19,390; the published prices give £18,390.
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  • Weight limit to confirm. For this model the 21 stone limit is listed as subject to confirmation and it has not been confirmed for this user; a person should confirm it.
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4. Sadler, options and weight limit: The agent resubmits after fixing the errors

    
The agent's request. Please quote two Stannah 260 Sadler perch stairlifts with 7 metres of rail for a user who weighs 16 stone. Include a landing stop, harnesses and straps, the heavy use charger and batteries and a 2-way communicator. The quote states a total of £18,390. It is ready to send.

    
Verdict: Needs approval.

    
    
      
  • Weight limit to confirm. For this model the 21 stone limit is listed as subject to confirmation and it has not been confirmed for this user; a person should confirm it.
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  • Order summary. 2 stairlifts at £9,195 each, £18,390 in total, 5 year warranty included, installation about 2 to 3 weeks.
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5. Sadler, options and weight limit: The agent resubmits after fixing the errors

    
The agent's request. Please quote two Stannah 260 Sadler perch stairlifts with 7 metres of rail for a user who weighs 16 stone. Include a landing stop, harnesses and straps, the heavy use charger and batteries and a 2-way communicator. The weight limit for this model has been confirmed for the user. The quote states a total of £18,390. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Order summary. 2 stairlifts at £9,195 each, £18,390 in total, 5 year warranty included, installation about 2 to 3 weeks.
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6. Joya, rail colour: A Joya with an alternative rail colour

    
The agent's request. Please quote one Stannah Joya with 10 metres of rail for a user who weighs 18 stone. Include an alternative rail colour, a landing stop, harnesses and straps, the heavy use charger and batteries and a 2-way communicator. The weight limit for this model has been confirmed for the user. The quote states a total of £13,195. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Alternative rail colour not available on the Joya. The Joya rail comes in Jet Black only; there is no alternative rail colour.
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  • Stated total does not match. The quote states a total of £13,195; the published prices give £12,595.
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7. Joya, rail colour: The agent resubmits after fixing the errors

    
The agent's request. Please quote one Stannah Joya with 10 metres of rail for a user who weighs 18 stone. Include a landing stop, harnesses and straps, the heavy use charger and batteries and a 2-way communicator. The weight limit for this model has been confirmed for the user. The quote states a total of £12,595. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Order summary. 1 stairlift at £12,595 each, £12,595 in total, 5 year warranty included, installation about 2 to 3 weeks.
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Narration transcript
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The text of the narrated walkthrough, step by step.

    
    
      
  1. Welcome to a demo of Predictika's Validator. An AI sales agent prepares a quote for curved stairlifts: the model, the length of rail, the options, and more. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the published Stannah pricing table and technical sheets and returns a verdict, every reason and the figures it computed.
    2. 
      
  2. I will start with the first request by the agent.
    3. 
      
  3. The agent says. Please quote two Stannah 260 Sadler perch stairlifts with 7 metres of rail for a user who weighs 16 stone. Include a landing stop, a powered swivel, a faux leather or woven seat, harnesses and straps, the heavy use charger and batteries and a 2-way communicator. The rest of the request is on screen. The quote states a total of £19,390.
    4. 
      
  4. Before it goes out, the agent calls the validator.
    5. 
      
  5. Blocked, with three findings and one approval, all in one answer. The 260 Sadler perch stairlift has no powered swivel option. The 260 Sadler perch stairlift has no faux leather or woven seat option. The quote states a total of £19,390; the published prices give £18,390.
    6. 
      
  6. The validator returned three blocking findings and one approval in one answer. A check that reads one field at a time would pass most of this; it shows only when the choices in the quote are checked against each other and against the stated total.
    7. 
      
  7. What this shows: for a weight limit that depends on the model and on one option (the powered hinge), a rules-based CPQ can do this only with workarounds.
    8. 
      
  8. Now the agent resubmits.
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  9. The corrected request. It changes the powered swivel to no, the faux leather or woven seat to no and the stated total as to 18,390 pounds.
    10. 
      
  10. It calls the validator again.
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  11. Not blocked, but held for a person.
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  12. The validator also returns the line-item quote. It starts with Stairlift base price (includes 6 m of rail) and Extra rail: 1 m beyond the included 6 m at 300 pounds per metre; the other four lines are on screen.
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  13. The three blocking findings are cleared; one approval remains for a person: weight limit to confirm.
    14. 
      
  14. The agent resubmits once more.
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  15. The revised request. It changes the weight limit confirmed for the user to yes.
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  16. It calls the validator once more.
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  17. This time the validator clears it.
    18. 
      
  18. The validator also returns the line-item quote. It starts with Stairlift base price (includes 6 m of rail) and Extra rail: 1 m beyond the included 6 m at 300 pounds per metre; the other four lines are on screen.
    19. 
      
  19. The earlier finding is cleared, and the validator's total, £18,390, matches the quote.
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  20. Four problems caught in one call, fixed in two passes, and a clean quote. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
    21.