How much does a Lovable/Bolt project takeover cost?

You released a V0 in Vibe Code. In a few hours, you have a screen, a flow, sometimes even a payment. Then the time comes to “go into production” and everything gets complicated.

The subject is not “does this work on my browser”. The subject is: does it hold up with real users, real data, real authentication, and clean deployment. That's where the App redesign cost becomes blurry, and that the Web app agency price varies from simple to x10 depending on what to repeat.

If you are still comparing the tools before this step, you can also read our article on Lovable vs Bolt to better understand the differences between the two approaches.

The aim of this article: to give you realistic ranges, explain what's driving up the bill, and show you a simple approach to unblock without starting from scratch.
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Lovable/Bolt project takeover: what exactly are we talking about?

A recovery is not “redoing the UI”. It means putting a database generated in vibe code back on “production” rails.

Concretely, a Lovable/Bolt project takeover (and the same for v0) can include:

• secure auth and accesses
  
  
• make data reliable (model, migrations, constraints)
  
  
• correct the deployment and the infrastructure (environment, variables, CI)
  
  
• improve performance (load time, queries, cache)
  
  
• put safeguards (logs, monitoring, error management)
  
  
• prepare the next steps (technical roadmap, agreements, handover)
  
  

It's seldom a single point. Often, we think we have “a deployment bug”, but the real blockage comes from a combination: fragile auth + inconsistent data + dependencies that explode during build.
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Why does a Vibe Code prototype crashes during production

Lovable, Bolt, and v0 are great for going fast. Their economic models also push you to prototype and iterate quickly via monthly subscriptions.

The problem is that “prototype speed” is often achieved at the price of compromises that come out later:

1) A code that works, but not a “maintainable” code

Vibe code can produce duplications, highly coupled components, scattered API calls, and business logic all over the place. As long as you are alone, that's fine. As soon as you add a dev, or fix 10 things, it becomes unstable.

2) Auth and roles: the place where you can't cheat

A prototype can “simulate” the connection. In prod, you need to manage sessions, refresh tokens, reset passwords, permissions, RGPD, and sometimes multi-tenant. It is often there that the App redesign cost appears.

3) Data: the prototype tolerates blur, the product does not

In production, poorly defined data is expensive: bugs, support, impossible exports, billing errors. Recovery often involves a real data model and migrations.

4) Deployment and performance: the reality of infrastructure

Locally, everything is fast. In prod, you have network, cache, builds, builds, quotas, 500 errors, environment variables, monitoring.

If you are still at the stage where you are mainly looking to frame the right product base, our guide How to develop a web application can also help you differentiate between a rapid prototype and a usable application.
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The 4 blocks that vary the cost: redesign app

If you are looking for a “random” estimate, you are going to be wrong. The correct calculation is to measure the effort over 4 blocks. That's exactly why the Web app agency price is sometimes very low, sometimes very high.

Block 1: Deployment and environment

What we often find in Lovable/Bolt covers:

• Build that breaks according to the environment
  
  
• missing variables, poorly managed secrets
  
  
• no CI/CD, no clean preview
  
  
• hosting configuration not stable
  
  

Typical effort: 1 to 5 days if the code is clean, 1 to 3 weeks if the architecture is inconsistent.

Block 2: Authentication and Authorizations

The “it works in demo” is not enough. In production, you generally need:

• robust auth (provider, sessions, error handling)
  
  
• roles and permissions
  
  
• protection of roads, APIs, and data
  
  
• forgotten paths (disconnection, exhales, multiple devices)
  
  

Typical effort: 2 to 10 days depending on the expected level of safety.

Block 3: Data and integrations

It's the most underrated block in Vibe Code.

• data model to be stabilized
  
  
• migrations
  
  
• validation rules
  
  
• integrations (CRM, billing, email, analytics)
  
  
• management of files, exports, backups
  
  

Typical effort: 3 to 15 days. It goes up quickly if the data already exists and you have to go back to it without losing history.

Block 4: Performance, Quality, Observability

This block turns a “nice” app into a “reliable” app.

• optimization of queries
  
  
• hides
  
  
• clean error handling
  
  
• usable logs
  
  
• monitoring, alerts
  
  
• targeted tests (not necessarily 100% coverage, but the key paths)
  
  

Typical effort: 2 to 10 days, more if the app has a lot of screens and edge cases.
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Price ranges: what you're really paying

Let's be clear: without an audit, no one can give “the price” of your takeover. On the other hand, we can give scripts that stick to the reality of the market.

An important point: the rates depend on the provider. The TJMs observed on the tech freelancer side in France often cost around several hundred euros per day, and agencies rise higher depending on seniority and specialization.

Scenario A: Targeted unblocking (the prototype is healthy)

You have a good base. There is 1 real point of friction (deployment, auth, data or perf) and we fix it properly.

• Current budget: 1,500 to 6,000 euros
  
  
• Current delay: 2 to 10 days
  
  

We even see offers “from 1,500 euros” on very targeted takeovers, when the scope is clear and the base usable.

Scenario B: Transition to “serious” production (several blocks to be processed)

The most frequent case in vibe code: it works, but you have to secure 2 to 4 blocks.

• Current budget: 6,000 to 15,000 euros
  
  
• Current delay: 2 to 4 weeks
  
  

This is often the best ratio. You maintain the speed of the prototype, but you remove the major risks.

Scenario C: Partial rebuild (we keep the product, we rebuild the foundations)

Here, we keep the product intent, sometimes the UI, but we redo part of the architecture, the data model, or the auth.

• Current budget: 15,000 to 30,000 euros
  
  
• Current delay: 1 to 2 months
  
  

At this level, we are close to traditional custom web app budgets, especially if your app becomes a real business application or a mini SaaS.

Scenario D: Complete rebuild (the prototype does not have to go any further)

It happens. The Vibe Code prototype proved the idea, but the code is too unstable, too coupled, or too risky.

• Current budget: 30,000 euros and more
  
  
• Current delay: 2 months and over
  
  

This is the scenario we are trying to avoid with a good diagnosis, because it is expensive and demoralizing.
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What makes the web app agency price explode on a Lovable/Bolt takeover

If you receive two quotes that are very far apart, it is not necessarily a scam. It is often a different implicit perimeter.

Here are the most common “multipliers”:

There are already users and data

Resuming an empty base is easy. Recovering a database with history, rights, and data that cannot be broken is another story. It is often the true heart of App redesign cost.

You need a high “production” level

B2B, sensitive data, payments, compliance, SLA. The bar is rising quickly, especially on auth, logs and security.

The prototype depends on fragile integrations

A tinkered Zapier, an API that is not stable, a webhook without retries. In production, each integration must be hardened.

Deployment must be industrialized

This is often where teams get stuck: build, environments, secrets, monitoring. Code is not the only subject.
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A simple way to estimate your app redesign cost in 15 minutes

Without a complicated tool, you can frame your resumption with 6 questions. Answer honestly, you will already have an idea of scenario A, B, C, or D.

1. Can someone explain the architecture in 5 minutes?
   
   
2. Is Auth real, with full roles and backgrounds?
   
   
3. Is the data model clear, with constraints and readable business logic?
   
   
4. Is the deployment repeatable, or is it “it works on my machine”?
   
   
5. In case of error, do we have useful logs, or nothing?
   
   
6. If we add 10 features, does it stick, or does it break everywhere?
   
   

If you answer “no” to 3 questions or more, you are probably in scenario B or C.
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Dr Lovable: a recovery designed to unlock quickly, without overpaying

At Scroll, we created Dr. Lovable to respond exactly to this moment when everything is at stake: between prototype vibe code and production.

The principle is deliberately simple:

1. Diagnosis : we look at your project, we identify the real blockage, and we give you a clear plan.
   
   
2. Targeted fix : we only intervene where it really blocks, on one of the 4 main subjects: deployment, auth, data, performance.
   
   
3. Clean exit : we leave you with a stable base, documented just what you need, and usable for the future.
   
   

And yes, despite the name, it's not just Lovable: we also do Bolt and v0, because the symptoms are the same when you go from Vibe Code to Prod.

To see what this type of intervention looks like on a concrete case, you can also read How Agence Scroll unlocked a business SaaS AI prototype. It is a good complement to reassure a reader who is still hesitating between targeted correction and more structured recovery.
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Three concrete examples of budgets (to give you an idea of where you are)

“We have a V0, but it's impossible to deploy”

Often a mix of dependencies, environment variables, build, and server/client routes.

Typical budget: 2,000 to 6,000 euros, depending on the cleanliness of the repo and the need for industrialization.

“Users connect, but the rights are not reliable”

It's a classic. Once you have roles, spaces, or data per customer, you need to secure.

Typical budget: 4,000 to 12,000 euros.

“Data is going in all directions”

Blurry model, fields that change, impossible exports, cascading bugs.

Typical budget: 6,000 to 18,000 euros, especially if you have to migrate without loss.
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The logical next step if you want a reliable number

The easiest way to obtain a serious estimate is to start with a short diagnosis and then to encrypt a targeted fix. This is exactly the Dr. Lovable approach: avoid the huge quote “just in case”, and also avoid the small quote that explodes along the way.

If your Vibe Code prototype is stuck, we can look at your project, identify the real crux, and quickly tell you if you prefer scenario A, B, C or D. Then, we only work on what brings you closer to production, without turning your recovery into an interminable overhaul.

If you want, you can contact us via the offer Dr. Lovable by Scroll : diagnosis, identification of the blockage, then fix targeted at deployment, auth, data or performance.