5 Best Basement Renovation Contractors in Johannesburg (2026)

Independently ranked by our review of ratings, reviews and reputation · How we chose

By Brad Smith, Home Services Expert · ✓ Data verified August 2026 · 8 min read

Basements are rare in Johannesburg homes to begin with, so basement renovation contractors in Johannesburg are harder to find than in cities built on damp climates and deep foundations. Between them these businesses have logged over 270 Google reviews, and every one sits at 4.7 stars or higher, and they're included because waterproofing and damp-proofing, the skill any real basement conversion depends on first, is exactly what they specialize in.

Short answer: None of the businesses below are dedicated basement renovation specialists, since that trade barely exists in Johannesburg. Masterproof SA (4.9 stars, 72 reviews) and Mews Waterproofing Johannesburg (4.8, 33 reviews) are the strongest-rated waterproofing contractors, the foundational skill for any below-ground space, while Afrisom Projects (4.7, 32 reviews) is a general construction company that could take on a full basement conversion.

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1. Maintenance Aid
2. Masterproof SA
3. Dampcon
4. Mews Waterproofing Joh…
5. Afrisom Projects Pty L…
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Johannesburg's Waterproofing and Construction Contractors Compared

#	Business	Rating	Reviews	Best for
1	Maintenance Aid	4.8 ★	93	Roofing and waterproofing, established firm	View ›
2	Masterproof SA	4.9 ★	72	Highest-rated waterproofing specialist	View ›
3	Dampcon	4.7 ★	40	Damp proofing since 1985	View ›
4	Mews Waterproofing Johannesburg	4.8 ★	33	Roof leak repairs / fast response	View ›
5	Afrisom Projects Pty Ltd	4.7 ★	32	Full renovation and construction	View ›

5 Best Basement Renovation Contractors in Johannesburg (2026)

Who to call for a basement project

#1 Overall🕑 Open 7 days↩ Responds to reviews

Maintenance Aid

4.893 Google reviews

Maintenance Aid is a Level 1 BBB Black Female owned waterproofing contractor operating from Highlands North, covering roofing, rising and lateral damp proofing, preparation and painting, and specialised tiling. Its founder, Adam, is named repeatedly in reviews as personally involved in projects, and the company's scope in preventing water ingress is directly relevant to keeping any below-ground space dry.

What people praise

Reviewers describe going beyond the agreed scope at no extra cost when a problem was spotted
Ten-year warranty offered on roofing and waterproofing work
Sites kept clean throughout multi-day projects, per multiple reviewers

Worth knowing

One reviewer reported paint peeling after six months and a slow response honouring the warranty, though the company states the issue was previously unknown to them

Reputation scorecardrank in Johannesburg

Rating4.8 / 5

Review volume93 · 97th

Confidencemoderate

Recency10 months ago

Info completenesssite · phone · hours

Rating breakdown91% 5-star

✓ VerifiedSource: Google

Our take: A well-established, well-reviewed waterproofing specialist with the core skill any basement space needs first. Its scope leans roofing and general waterproofing rather than a full basement conversion, so confirm directly whether it takes on below-ground finishing work.

Website +27114401649 Directions

33 Athol St, Highlands North, Johannesburg, 2192

#2🕑 Open 5 days/wk↩ Responds to reviews

Masterproof SA

4.972 Google reviews

Masterproof SA is a Johannesburg engineered waterproofing company using polymer-based, water-based sealing systems for flat roofs, slab roofs, corrugated roofs, boundary walls, patios and foundations. It's a materials and application specialist rather than a full renovation contractor, but foundation and boundary-wall waterproofing sits directly at the core of what a basement conversion needs to succeed long-term.

What people praise

Highest rating on this list at 4.9 stars
Reviewers repeatedly describe daily progress updates with photos throughout a project
Specifically offers foundation waterproofing among its listed services

Worth knowing

Focused on waterproofing application rather than full renovation or finishing work

Reputation scorecardrank in Johannesburg

Rating4.9 / 5

Review volume72 · 92th

Confidenceearly

Recency2 months ago

Info completenesssite · phone · hours

Rating breakdown94% 5-star

✓ VerifiedSource: Google

Our take: The strongest-rated waterproofing name here, and its foundation-waterproofing service is exactly the starting point for any basement space. Pair it with a construction contractor if you need the space finished out beyond just sealing it.

Website +27735555553 Directions

Ext, Masterproof SA office, 9 Commerce Cres, Eastgate, Johannesburg, 2090

#3🕑 Open 5 days/wk↩ Responds to reviews

Dampcon

4.740 Google reviews

Dampcon is a Johannesburg waterproofing, damp proofing and building maintenance specialist operating since 1985, covering rising damp, French drains and remedial preparation and painting for residential, commercial and industrial clients. Its decades-long track record in solving damp issues, one reviewer specifically notes it fixed rising damp that other contractors couldn't resolve, is directly relevant to any below-ground renovation.

What people praise

Longest operating history among the businesses on this page, since 1985
Specifically handles rising damp and French drains, core issues for below-ground spaces
Reviewers describe multiple site visits and consistent supervisors checking on progress

Worth knowing

Smaller recent review volume, with several reviews dating back a few years

Reputation scorecardrank in Johannesburg

Rating4.7 / 5

Review volume40 · 87th

Confidenceearly

Recencyabout a year ago

Info completenesssite · phone · hours

Rating breakdown80% 5-star

✓ VerifiedSource: Google

Our take: The deepest track record here in solving the exact damp problems that make or break a basement conversion. A strong first call if your project starts with a damp or water-ingress issue.

Website +27110242408 Directions

37 Koster St, Booysens, Johannesburg, 2091

#4🕑 Open 7 days↩ Responds to reviews

Mews Waterproofing Johannesburg

4.833 Google reviews

Mews Waterproofing Johannesburg is a roof waterproofing and leak-repair specialist covering flat and pitched roofs, leak diagnosis and torch-on membrane installation across Johannesburg. Reviewers describe it resolving long-standing leaks that other contractors had failed to fix, and its same-day response for urgent leak issues stands out in the review set.

What people praise

Reviewers describe fast, same-day fixes for leak issues
Resolved a leak that multiple other contractors reportedly could not fix, per one reviewer
Clear communication and explanation of the process before starting work

Worth knowing

A newer business with a smaller review base than some competitors here

Reputation scorecardrank in Johannesburg

Rating4.8 / 5

Review volume33 · 82th

Confidenceearly

Recency4 weeks ago

Info completenesssite · phone · hours

Rating breakdown82% 5-star

✓ VerifiedSource: Google

Our take: Strong, fast-turnaround reviews focused specifically on leak repair. Worth a call if your basement or below-ground space has an active leak that needs fixing before any renovation work can proceed.

Website +27793404116 Directions

98 Forest Rd, Bramley Bramely, Johannesburg, 2018

#5🕑 Open 7 days↩ Responds to reviews

Afrisom Projects Pty Ltd

4.732 Google reviews

Afrisom Projects Pty Ltd is a privately owned Johannesburg construction company handling corporate, residential construction and renovations for developers and homeowners, with over 35 years of combined experience across its ownership. It's the closest match on this page to a full renovation contractor capable of finishing out a below-ground space, rather than a waterproofing specialist alone.

What people praise

The only genuine construction and renovation company on this list, rather than a waterproofing specialist
Reviewers describe attentive project management and consistent communication
Handles a range of project types, from patios to full home gyms

Worth knowing

No reviews specifically describe basement or below-ground conversion work, so confirm relevant experience before hiring

Reputation scorecardrank in Johannesburg

Rating4.7 / 5

Review volume32 · 76th

Confidenceearly

Recency4 months ago

Info completenesssite · phone · hours

Rating breakdown88% 5-star

✓ VerifiedSource: Google

Our take: The best-positioned business here for an actual basement finishing project, since it's a construction company rather than a waterproofing specialist. Pair it with a waterproofing contractor from this list if the space needs damp-proofing work first.

Website +27724896107 Directions

90 Mitchell St, Houghton Estate, Johannesburg, 2198

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How we score

Every number on this page comes from public Google data on the date shown, not from opinion or payment. Rating is the company’s live Google star average. Review volume measures how many customers have rated them, ranked against comparable Johannesburg contractors. Confidence weighs the rating by that volume, so a 4.9 from over 70 reviewers carries more weight than a perfect score from a handful. Recency reflects how recently customers are still leaving reviews. No company can pay to change these numbers.

How much does basement waterproofing and renovation cost in Johannesburg? (2026)

Pricing depends heavily on the scope, whether the job is primarily waterproofing and damp-proofing or a full finishing renovation, and the size of the space. No independently verifiable price list was available across these businesses for basement-specific work, so get a detailed written quote after a site visit.

Serving all of Johannesburg

These businesses operate from Highlands North, Eastgate, Booysens, Bramley and Houghton Estate, with most covering the greater Johannesburg area. Searching for a basement renovation contractor near me? Given how uncommon basement-specific specialists are locally, it’s worth calling ahead to confirm a company can take on your exact project scope.

What to ask before hiring for a basement project in Johannesburg

Do you have experience with below-ground or basement-specific work, not just above-ground waterproofing?
What waterproofing system do you recommend for a below-ground space, and why?
What warranty do you offer against future leaks or damp?
Will you handle the finishing work, or only the waterproofing stage?
Can you provide references from a similar below-ground project?

Frequently asked questions

Why don’t the businesses on this page specialize in basement renovation specifically?

Basements are uncommon in Johannesburg residential construction, so there is little demand for a dedicated basement renovation trade. Businesses here that come closest are waterproofing and damp-proofing specialists, since that skill is essential for any below-ground space, alongside general construction companies that could take on a full conversion.

Are these rankings paid?

No. Rankings come from the public Google data in the scorecard. A business can pay to be a Featured Partner, which adds a badge and top placement, but that never changes another business’s score or position on the underlying data.

How often is this updated?

The data carries a verified date (August 2026 on this page). We refresh listings periodically so ratings and review counts stay current.

What should I prioritize first in a basement renovation?

Waterproofing and damp-proofing should come first, since any finishing work will fail if water continues to enter the space. Masterproof SA and Dampcon both specifically address foundation and damp issues that would need resolving before finishing work begins.

How did you choose these businesses?

We searched for basement renovation contractors in Johannesburg and ranked every business with a public Google presence doing related waterproofing, damp-proofing or construction work, since no dedicated basement specialists with a public profile were found. See How we score above.

The bottom line

If you’re planning a basement project in Johannesburg, start with a waterproofing specialist like Masterproof SA or Dampcon to solve any damp or leak issue, then bring in a general contractor like Afrisom Projects for the finishing work. No single business here covers both ends of that job.

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