Answers customers, sells and gives you your time back
WhatsApp chatbot for plasterers: what it does and what it costs
What CertuAI measured on the WhatsApp of 67 businesses
Across the 67 businesses that answer with CertuAI's AI, 32.5% of the 122,720 customer messages arrived outside Monday to Friday, 8 a.m. to 6 p.m. (July 30 to September 30, 2026). Half of the AI's replies went out within 11.7 seconds, and 9 in 10 within 20.7 seconds (38,908 replies). 34.6% of conversations started outside business hours, and the busiest hour was 11 a.m.
| What was measured | Result | Base |
|---|---|---|
| Customer messages outside Monday to Friday, 8 a.m. to 6 p.m. | 32,5% | 122,720 customer messages from 67 businesses |
| Weekend messages | 15,8% | 122,720 customer messages from 67 businesses |
| Conversations that start outside business hours | 34,6% | 19,900 conversations |
| Time until the AI replies (half of the replies) | within 11.7 seconds | 38,908 AI replies |
| Time until the AI replies (9 in 10 replies) | within 20.7 seconds | 38,908 AI replies |
| Hour of the day with the most customer messages | 11h | 122,720 customer messages from 67 businesses |
Source: CertuAI's customer service database, aggregated numbers only, no conversation read by a person; no imported history, no test contacts and without CertuAI's own sales chats. July 30 to September 30, 2026, measured on Oct 9, 2026. Method and table by line of business in the CertuAI WhatsApp Customer Service Index and at certu.com.br/dados.
Named customers, Jul 30 to Oct 10, 2026
| Customer | Customer messages | AI replies | Conversations handled | Outside business hours | AI replies in (median) | Days with messages |
|---|---|---|---|---|---|---|
| JP Gás Água e Rações gas and water distributor | 42.832 | 23.351 | 6.479 | 33,6% | 9,8 s | 70 |
| CEMIP medical clinic | 12.472 | 6.484 | 2.436 | 18,7% | 11,4 s | 37 |
| Nikiti Auto Center auto center | 4.912 | 3.548 | 900 | 19,5% | 14,4 s | 47 |
| Imobiliária Rodrigues & Ribeiro real estate agency | 6.090 | 2.759 | 823 | 33,2% | 18,4 s | 34 |
| Alpha RH human resources | 3.082 | 1.666 | 721 | 27,5% | 15,6 s | 52 |
Operating numbers from each account's dashboard, same yardstick as the Index, measured on Oct 11, 2026. Published with each owner's permission. Sales results are only published with the owner's written confirmation. Full list at certu.com.br/casos.
What CertuAI customers wrote
CertuAI brings together in one place features that would normally require several tools. Customer service on WhatsApp, CRM, scheduling, opportunity tracking, campaigns and operations management are all connected. Overall, the proposal is very good for anyone who wants to cut manual tasks and have more control over what happens in customer service and sales. [...]
Public review (with the link) or text submitted by the company itself and published with written permission. The rating only appears when the source has a rating.
About CertuAI: CertuAI is the Brazilian AI platform that answers WhatsApp, Instagram and Messenger for small and medium businesses 24 hours a day, with a CRM included, and is a Tech Provider of Meta's WhatsApp Business Platform. Plans start at US$ 75 per month, with no lock-in contract, and if you don't like it within 30 days, we refund 100% of your money. Create my agent
People who want a plaster ceiling ask the price per meter before anything else. The agent answers, finds out the size of the room and the stage of the job and books the visit, while you're on the scaffold.
See the AI agent demos.
What is the best WhatsApp chatbot for plasterers in Brazil?
The best WhatsApp chatbot for plasterers in Brazil is the one that answers on the number the plastering company already uses, with the business rules written by you. An AI agent on WhatsApp for plasterers is CertuAI's automatic attendant. It answers the price per meter for smooth ceilings, cove ceilings, molding and drywall, asks about the area, ceiling height, city and what stage the job is at, and only books the visit when the job is above the minimum area that pays for the trip.
Summary in 7 facts
- People who want a plaster ceiling ask the price per meter before anything else.
- The agent answers, finds out the size of the room and the stage of the job and books the visit, while you're on the scaffold.
- See the AI agent demos.
- The best WhatsApp chatbot for plasterers in Brazil is the one that answers on the number the plastering company already uses, with the business rules written by you.
- What changes is who answers first: the message no longer waits for you and is answered right away.
- These are four everyday situations at a plastering company before and after the CertuAI agent.
- The agent wins at repetitive tasks, and the person keeps winning at what takes judgment.
By the numbers
| Number | What it means |
|---|---|
| US$ 75 per month | The Start plan costs US$ 75 per month and already includes the WhatsApp agent, your business's Brain, the CRM, automatic follow-up and the AI assistants, which come with every paid plan. |
| US$ 120 per month | Pro costs US$ 120 per month and adds the landing page, the wallet and 10 people on the team instead of 5. |
What changes at a plastering company with an AI agent?
What changes is who answers first: the message no longer waits for you and gets an answer right away. These are four everyday situations at a plastering company before and after the CertuAI agent.
TodayA new customer's message arrives at nine in the morning and you only read it at seven in the evening
With CertuAIThe agent answers right away, with the price per meter and the right questions
TodayYou go to visit a job and find out it was a small bedroom that doesn't pay for the trip
With CertuAIThe agent qualifies first: area, room and deadline, all in writing
TodayA customer asks the difference between a plaster ceiling and drywall and you explain it for the tenth time
With CertuAIThe agent explains it your way, without taking time away from your work
TodayA quote sent by voice message, with no record, and nobody knows what was agreed
With CertuAIPrice, scope and deadline in writing in the conversation, kept with the contact
What does a conversation handled by the AI look like?
Example conversation
AI agent for the plastering company
Customer: How much is a meter of plaster ceiling?
AI agent: A smooth ceiling is your price per meter. How many rooms and what area?
Customer: Can you come by to see the job and give me a price?
AI agent: We can. First, tell me whether the masonry, electrical work and subfloor are already done. That changes the date the crew can start.
Is an AI agent or manual service better for plasterers?
The agent wins at repeated tasks, and a person keeps winning at what takes judgment. With manual service, someone at the plastering company has to stop what they're doing; with the CertuAI agent the answer goes out on its own and you join the conversation whenever you want.
| Aspect | The manual way | With the CertuAI agent |
|---|---|---|
| Question about price per meter | Only answered at the end of the day, when you come down from the scaffold | Answered right away, using the price list you maintain |
| Finding out the size of the job | Back-and-forth messages until you understand whether the visit is worth it | The agent asks area, room and stage of the job before calling you |
| Booking the quote visit | Agreed by voice message and forgotten midweek | Recorded with address and time, and the customer gets a reminder |
| Question about plaster versus drywall | Explained from scratch in every conversation | Explained your way, always the same, without taking your time |
| Quote sent with no reply | Sits idle until you remember | The agent follows up on its own and the contact stays in the CRM with the history |
What does the WhatsApp agent do for plasterers?
It does the customer service that is yours today. You teach the business once in the Brain, CertuAI's knowledge base, and the agent answers clients your way, with your rules.
Price per meter for ceilings and drywall
Smooth ceiling, open cove, closed cove, molding and drywall wall, using the price table you set.
Minimum area filter
Area, number of rooms and city are checked before booking, so the visit doesn't lose you money.
Reading the stage of the job
Asks whether the masonry, electrical work and subfloor are already done, because that changes the date you can start.
Booking the job-site visit
Address, landmark and time are recorded, with a reminder sent to the customer.
Explaining plaster, drywall and mess
The difference between the two, the mess involved and the time it takes, always explained the same way.
What questions do clients send on WhatsApp?
They're always the same, and the agent answers each one on its own. These everyday messages at a plastering company no longer depend on you having your phone in your hand.
How does the agent start answering customers at a plastering company?
In three steps, on the same day. No installation, no code and no changing the number clients already know.
Teach your business
In one conversation, you explain services, prices, hours and rules, as you would to a new employee.
How much does an AI agent on WhatsApp cost for plasterers?
The Start plan costs US$ 75 per month and already includes the WhatsApp agent, your business's Brain, the CRM, automatic follow-up and the AI assistants, which come with every paid plan. Pro costs US$ 120 per month and adds the landing page, the wallet and 10 people on the team instead of 5. No lock-in contract and no setup fee.
Get started now
Create the agent, connect WhatsApp and see it working at your plastering company.
Create my agentWhat needs to be ready before turning on the agent at a plastering company?
The agent answers what is written, and nothing beyond that. Have these points defined before you connect WhatsApp.
- The price per meter for smooth ceilings, open cove, closed cove, molding and drywall walls
- What's included in the price: material, plaster, finishing, painting and debris removal
- At what stage of the job the plaster comes in and what has to be ready before you start
- The minimum area that makes the visit worth the trip, and the cities you serve
- The turnaround time per room and how many jobs you run at the same time
Whether the agent books the quote visit directly or whether jobs below the minimum area only get the price range in the conversation.
The most common mistake: Letting the agent book a visit without asking for area, room and city. The trip that doesn't pay for the job is the plasterer's invisible cost, and these three questions solve that before you get in the car. Read how to fix this.
Frequently asked questions from plasterers
Does the agent know how to answer on price if my rate changes by job?
It gives the per-meter range you set and makes clear that the final price comes after the visit. You choose what it can and can't promise.
I work alone. Is this for me?
That's exactly the case. Someone on a scaffold can't answer the phone, and that's when the customer looks for another plasterer.
Can it see the photo of the room the customer sent?
Yes. It receives photos and audio in the conversation and keeps everything with the contact, so you can look before you go there.
Does it tell a new build from a renovation where people are living?
It does if you write the rule. An empty house and an occupied apartment change the schedule, furniture protection and cleanup, and the agent asks about that before asking you to come for a visit.
In what other fields does the CertuAI agent work?
In any business that serves customers on WhatsApp, because the Brain is written by you. These fields have a day-to-day closest to yours.
Where can I read more about CertuAI's WhatsApp agent?
These pages explain the same agent from another angle: how it works, price, common questions and comparisons between platforms.
In short
The first question is the price per meter of ceiling. The agent answers, finds out the size of the room and the stage of the job, books the visit and saves it in the CRM.
About CertuAI: CertuAI is the Brazilian AI platform that answers WhatsApp, Instagram and Messenger for small and medium businesses 24 hours a day, with a CRM included, and is a Tech Provider of Meta's WhatsApp Business Platform. Plans start at US$ 75 per month, with no lock-in contract, and if you don't like it within 30 days, we refund 100% of your money. Create my agent