Get matched with top plaster repair specialists in Thermal, CA

Q: How much does it cost to replace a plaster ceiling?

• <div><p>If you already have plaster walls and ceilings, adding new plaster costs $2 to $10 per square foot. For an average-sized room, that would come out to $1,200 to $10,000. However, the <a href="https://www.angi.com/articles/cost-to-replace-plaster-with-drywall.htm">cost to replace plaster with drywall</a> is higher&mdash;running between $720 and $1,250 for a 10-by-8-foot wall or ceiling (not including drywall finishing). </p></div>

Q: Can I do my own plastering?

• <div><p>It is possible to apply plaster on the interior or exterior of your home, but we don&rsquo;t recommend it. Plaster is easy to apply in theory, but in reality, it can be a challenging material to work with, and it&rsquo;s difficult to get the finished product to look clean, even, and smooth. Many DIYers end up calling in a professional afterward to touch up the area or even redo it entirely because of mistakes they made in the process. Hiring a plaster pro will cost more, but it&rsquo;s usually the best option to achieve high-quality results.</p></div>

Q: Can you install drywall over plaster?

• <div><p>Yes, you can install drywall over plaster, but there are important factors to consider. While it can create a smooth, flat surface, it is often not the best approach. Installing drywall over plaster will increase the wall's thickness, which can cause issues with existing window and door frames that may no longer fit. You might also need to adjust power outlets to keep them accessible. A better, though more expensive, option is to remove the old plaster and lath entirely before installing new drywall. Drywalling directly over plaster seals in the old material, and if any problems arise later, you will need to remove both layers down to the structural beams for repairs. Given the potential complications, this job is best handled by professionals.</p></div>

Q: How do you fill bad plastering?

• <div><p>If the holes in the plaster are small, you can fill them with layers of patching plaster until they&rsquo;re filled. After it dries, you can sand the plaster and paint over it. If the hole is much larger, consider using bonding plaster first and then a layer of patching plaster, completing the process with sanding and a layer of paint. </p></div>

Q: Why is my plaster ceiling sagging?

• <div><p>Plaster ceilings can sag for several reasons. In some cases, the plaster and other building materials shift and come apart over time, which is why you&rsquo;ll commonly find drooping plaster ceilings in older homes. Improper installation, foot traffic, and water damage&mdash;often from a leaky roof or a broken pipe&mdash;can also cause plaster ceilings to sag.</p></div>

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Verified Reviews for Plaster Repair pros in Thermal, CA

*The Angi rating for Plaster Repair companies in Thermal, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Plaster Repair needs.

*The HomeAdvisor rating for Plaster Repair companies in Thermal, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Plaster Repair needs.

Last update on December 05, 2025

Reviewed in December 2025
Joe install a new panel at my house , he completed the job as promised and everything went smooth and easy.
Meek Electric LLC
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Reviewed in July 2024
I would highly recommend this company took care of all my water damage and mold issues.
Executive 1 Demolition Restoration
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Reviewed in March 2023
I didn't receive any feed back to whether or not they are finished with this job order. They left behind alot of work material believing that this job is not fully complete! Thou,looking at the site,it looks like there's still more work to be completed! Overall,this co.pany really...
Platinum Roofing Company
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Reviewed in March 2022
Junior was very fast and professional. My carpets and couch look like new, would definitely hire him again.
LJA Cleaning Services
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Reviewed in November 2015
The knowledge of the crew was excellent. They have years of experience that leads to efficiency, saving time and money. The crew at SSP helped me repair my septic system with a truly proffessional performance of the job.
Sewer & Septic Pros, Inc.
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Reviewed in January 2013
Hill Electric did excellent work. Todd and his assistant were prompt, efficient and knowledgeable. Other contractors had told me significant work (including punching through my ceilings) would be required to remedy some of the problems. Hill Electric found all problems involved wiring or...
Hill Electric Inc
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Reviewed in April 2012
4000Jerry (the owner) of Summit Transmissions started things off with an invite to his shop to meet him and see his facilities. Once there, I was welcomed and shown why he is the best place to go to for vehicle transmission work. Not only does he have accreditation from the Better Business...
SUMMIT TRANSMISSIONS
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Find Plaster repair specialists in Thermal

PG Plastering

4.8(

)

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 2000

Free estimates

"Project: Repair and partially replace stucco surface of small retaining wall. Phil met with me and we discussed how to treat a short retaining wall that was losing the stucco surface after about 4 years since it was originally plastered. The wall was alowing water seepage to come thru the concrete block and lifting the original stucco finish off. Phil suggested a repair , consisting of first scraping all loose stucco off the wall and then applying an adhesive type undercoat followed by a total restucco of the wall. It was done very professionally , minimal debris, 2-day process , and it looks great. Now I just have to see how it holds up over the next 4-5 years . Highly recommend PG Plastering."

Response time2 hrs

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1995

"It was an excellent experience. The painters are always courteous, professional. They cleaned up after themselves."

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1990

Free estimates

Emergency services offered

"Excellent, detailed work on all projects with reasonable prices initially hired for plastering work was so good hired Tony to repair a roof , patio renovation, stair renovation. Referred to neighbors"

+86

Recommended by95%of homeowners

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Superior Plastering - Unlicensed Contractor

3.9(

)

Plaster - Repair

Serving Thermal, CA and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"They were able to come out in a timely manner and do some drywall repairs. When I noticed some needed touch up, they were willing to come back and make the area better. Like thier customer service."

Response time1 day

Response rate85%

Recommended by71%of homeowners

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Fredy’s Drywall Repair and Handyman Services

5.0(

)

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

Emergency services offered

"Very professional, i would use again"

+28

Recommended by100%of homeowners

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Just Do It Builders Inc

4.4(

215

)

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1991

Free estimates

Credit card accepted

"Just Do It arrived as scheduled and performed the work to my satisfaction. The drywall repairs were as promised and very professional.
"

+29

Recommended by70%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1986

Credit card accepted

"Very good work! I have used them before & will use them again!"

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 2004

Emergency services offered

"It went great! Every thing done right, professional and great quality. Wouldn't use anyone else. The work is guaranteed... No corners cut ... I have recommended to all Family and friends they are happy with the work as well...."

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1994

Free estimates

Emergency services offered

"Matt came to inspect our roof and found another tile that needed to be replaced in addition to the 2 that were already broken. He came the next day to do the job. In addition to replacing the tiles, he fixed other tiles that were previously repaired by another company. He was efficient and did an awesome job. Reasonable price and would use him again for any future jobs."

Recommended by59%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1981

Free estimates

"Excellent, the drywall even was perfect after the electrical work was completed for our garage
"

+16

Recommended by92%of homeowners

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Showing 1-10 of 61

Plaster Repair questions, answered by experts

If you already have plaster walls and ceilings, adding new plaster costs $2 to $10 per square foot. For an average-sized room, that would come out to $1,200 to $10,000. However, the cost to replace plaster with drywall is higher—running between $720 and $1,250 for a 10-by-8-foot wall or ceiling (not including drywall finishing).

It is possible to apply plaster on the interior or exterior of your home, but we don’t recommend it. Plaster is easy to apply in theory, but in reality, it can be a challenging material to work with, and it’s difficult to get the finished product to look clean, even, and smooth. Many DIYers end up calling in a professional afterward to touch up the area or even redo it entirely because of mistakes they made in the process. Hiring a plaster pro will cost more, but it’s usually the best option to achieve high-quality results.

Yes, you can install drywall over plaster, but there are important factors to consider. While it can create a smooth, flat surface, it is often not the best approach. Installing drywall over plaster will increase the wall's thickness, which can cause issues with existing window and door frames that may no longer fit. You might also need to adjust power outlets to keep them accessible. A better, though more expensive, option is to remove the old plaster and lath entirely before installing new drywall. Drywalling directly over plaster seals in the old material, and if any problems arise later, you will need to remove both layers down to the structural beams for repairs. Given the potential complications, this job is best handled by professionals.

If the holes in the plaster are small, you can fill them with layers of patching plaster until they’re filled. After it dries, you can sand the plaster and paint over it. If the hole is much larger, consider using bonding plaster first and then a layer of patching plaster, completing the process with sanding and a layer of paint.

Plaster ceilings can sag for several reasons. In some cases, the plaster and other building materials shift and come apart over time, which is why you’ll commonly find drooping plaster ceilings in older homes. Improper installation, foot traffic, and water damage—often from a leaky roof or a broken pipe—can also cause plaster ceilings to sag.

The Thermal, CA homeowners’ guide to plaster repairs

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

Deirdre Sullivan
•
Jul 9, 2026Jul 9, 2026
How Much Does Plaster Repair Cost? [2026 Data]
Plaster repair costs are determined by the size and type of damage. Discover why some fixes you can DIY and why some require a pro’s help.
Mizuki Hisaka
•
Jul 31, 2026Jul 31, 2026
How Much Does Plastering Cost? [2026 Data]
The cost of plastering walls and ceilings depends on the room size and ceiling height. Our tips can help you estimate an accurate cost.
Stephanie Mickelson
•
Jul 10, 2026Jul 10, 2026
How Much Does It Cost to Apply Venetian Plaster? [2026 Data]
Venetian plaster can add depth and texture to your aesthetic. Learn how much Venetian plaster costs based on factors like square footage and whether you hire a pro to help.
Angi
•
May 21, 2026May 21, 2026
How to Hire a Plaster Repair Professional
Finding a qualified plaster repair pro? Learn how to hire the right specialist, what questions to ask, and what to expect for your project.
Katy Willis
•
Jul 20, 2026Jul 20, 2026
What Is Behind Your Lath and Plaster Walls?
You can find plaster walls in a lot of older homes. What’s behind these walls—whether that’s lath or calcimine—can have an impact on how long they last. Finding out the age of your house can help you determine what you’re dealing with.
Jamie Cattanach
•
Jul 9, 2026Jul 9, 2026
Who Does Plaster Work and What Is Their Job Like?
Who does plaster work? A plasterer, of course—one who’s gone through years of training to master this subtle construction art. Here’s what you need to know.