603 Basement Solutions vs Crack-X

These two companies are easy to line up next to each other and easy to misread, because they fix different problems. 603 Basement Solutions is an East Kingston, NH independent that installs a whole-basement waterproofing system: an interior perimeter drain tied to a sump, a vapor barrier, a dehumidifier, plus radon mitigation in-house. Crack-X is a Manchester, NH firm that has spent more than 30 years on one thing, sealing foundation cracks and bulkheads with epoxy and urethane injection. So the honest starting point is not "which company is better" but "what is actually leaking." For a wet basement driven by hydrostatic pressure or a high water table, with water spreading across the floor or seeping in at the cove joint, our pick is 603 Basement Solutions. For a single isolated crack in a poured foundation wall, or a leaking bulkhead, Crack-X is the right, targeted, lower-cost fix, and paying for a full system would be overbuying. On Google, 603 holds 4.9 stars across 250 reviews and Crack-X holds 4.8 across 51 (2026). The gauge below highlights 603 on five-star share, but the scope difference matters far more than the rating gap. Here is the full comparison, with sources.

Our findings follow our published methodology. Every figure below is dated and sourced.

At a glance

What homeowners report

Before the star numbers, one honest caveat: these review bases are very different sizes, so read them at different confidence levels. 603 Basement Solutions has 250 Google reviews; Crack-X has 51. A 51-review sample is real and useful, but it is a fifth the depth, so a single bad month would move Crack-X's average far more than it would move 603's.

Per its Google Business Profile, 603 holds 4.9 across 250 reviews (live June 2026), and the rated breakdown captured May 19, 2026 shows 243 of 249 reviews at five stars against just 2 one-star. That is a clean distribution: fewer than one review in a hundred lands at the bottom. Per its Google profile, Crack-X holds 4.8 across 51 reviews (as of April 2026), with 47 of 51 at five stars and, notably, zero one-star reviews. The non-five-star reviews it does have sit in the middle, 1 four-star, 1 three-star, and 2 two-star, rather than at the floor.

Run the share numbers and 603 comes out ahead on the headline: 97.6 percent five-star (243 of 249) against 92.2 percent for Crack-X (47 of 51), which is why the gauge highlights 603. But that 5.4-point gap rests on a 51-review base where two two-star reviews swing the percentage by almost four points on their own. The more durable read is that both records are strong, neither has a one-star problem, and Crack-X's clean floor (zero one-star) is itself a good sign for a contractor.

The review themes are where the difference in what each company does becomes obvious. 603's most-mentioned topics span the whole job and the experience around it: sump pump installation (30), radon mitigation (29), basement waterproofing (21), quick response (20), courteous staff (18), and estimate (18), per its Google profile. Crack-X's themes are tightly clustered on its specialty: courteous staff (12), foundation crack repair (11), bulkhead build (5), warranty (5), responsiveness (5), and water leak repair (3), per its Google profile. You can read the scope of each business straight out of its reviews. People hire 603 for systems and hire Crack-X for cracks and bulkheads. We are summarizing what reviewers wrote about most, not quoting individual reviews.

There is also a candor signal on the 603 side worth weighing for anyone deciding how much work to buy. On a public r/newhampshire thread, several homeowners described 603 as the company that proposed the least-invasive correct fix rather than the biggest job, with one writing that 603 was the only company that "didn't try and upsell some massive project" (thread, 2026). That thread does not discuss Crack-X, so we cite it only for what it shows about 603: a no-pressure reputation from named homeowners. It happens to reinforce the theme of this whole page, which is to buy the fix your problem actually needs.

The real difference: a whole-basement system vs crack injection

This is the comparison that matters, and it is a question of scope, not quality. The two companies are not competing for the same job.

603 installs a self-branded whole-basement approach it calls the Forever Dry System: a full interior perimeter drain that relieves water pressure under the slab, tied to a sump pump, paired with a wall vapor barrier and a dehumidifier, all designed and warrantied under its own name, per its site. (We do not call that system patented, because no patent has been verified.) That is the fix for water that is coming in across a broad area, water pushing up through the slab or in at the cove joint where the floor meets the wall, which is the typical pattern in a New Hampshire basement with a high water table and weeks of spring snowmelt.

Crack-X does something narrower and, for the right problem, more precise. Its specialty is sealing a specific defect: epoxy or urethane injection into a foundation wall crack, and waterproofing around bulkheads, per its site. If your water is entering through one identifiable crack in a poured concrete wall, or running in around a bulkhead, injecting and sealing that crack is the targeted repair. Crack-X positions itself as "less expensive than similar methods," and with more than 30 years specializing in this work, it has the focused track record to match. It does not try to be a perimeter-drainage waterproofer, and it would be unfair to grade it as a worse version of one.

So the diagnosis comes first. Water across the floor, or at the cove joint, in multiple spots, points to hydrostatic pressure and a drainage problem, 603's territory. Water tracing back to one crack or a bulkhead points to a sealing problem, Crack-X's territory. A good inspection from either company should tell you which you have, and a homeowner with a single wet crack has no reason to pay for a full perimeter system.

Warranty and radon

Both companies put a transferable warranty in writing, scaled to what they do.

603 publishes a named "Dry for Life" transferable guarantee on its site, though the exact written contract terms are worth confirming at quote time, treat the wording as marketing language until you have the contract in hand (603basementsolutions.com). Crack-X offers a 10-year transferable warranty on most wall cracks, per its site. A 10-year transferable crack warranty is a meaningful commitment for a targeted repair, and the fact that "warranty" shows up as a recurring theme in Crack-X reviews suggests customers notice it. On the BBB, 603 holds A+ and has been accredited since 2022; Crack-X holds A+ but is not accredited, per its Manchester BBB profile, accessed June 2026.

Radon is a clean point of separation, not because Crack-X falls short but because it is out of scope. 603 handles radon mitigation in-house, and radon appears 29 times in its review themes (603 on Google), which matters in New Hampshire, where radon is common in the granite bedrock and a wet-basement project is a natural moment to deal with it. Crack-X does not do radon. If radon is part of your concern, that points toward 603 (or another full-service firm), and a crack-injection job will not address it either way.

Pricing

Neither company publishes fixed prices online, which is true across the whole category. Both quote after a free inspection, because the number depends entirely on the problem: a single crack injection and a full interior perimeter system are not in the same price universe. That is the practical upside of matching the fix to the problem. A targeted Crack-X repair on one wall crack should cost a fraction of a whole-basement system, and Crack-X's own "less expensive than similar methods" positioning is consistent with that (crackx.com).

For a rough local anchor on the value of buying only what you need, a homeowner on r/newhampshire reported a roughly $16,000 quote from 603 for an interior drain and sump, while several in the thread credited 603 with recommending the least-invasive correct fix rather than a larger job (thread, 2026). That is a single homeowner's report about one home and one inspection, not a price list, and the thread does not mention Crack-X. We cite it only as a homeowner-reported data point on scope and value. The honest move is the same with either company: get the problem diagnosed, then get the written scope and price for the fix that problem requires.

How they net out

Our pick

Our pick depends on what is leaking, and that is the honest answer here, not a dodge. For a wet basement driven by hydrostatic pressure or a high water table, with water spreading across the floor or coming in at the cove joint in more than one spot, our pick is 603 Basement Solutions: a full interior perimeter drain tied to a sump, a vapor barrier, a dehumidifier, a self-branded system with a published transferable warranty, and in-house radon. On the criteria we weigh, 603 also carries the cleaner deep-review record (97.6 percent five-star on 250 reviews) and a documented no-pressure reputation from homeowners. To be clear about what that pick is and is not: it is the right call for a whole-basement water problem, and it is not a verdict that 603 does crack injection better than a specialist.

For a single isolated foundation wall crack, or a leaking bulkhead, Crack-X is the right choice, and we will not pretend a full system is the smarter buy in that case. Thirty-plus years of focus, a 10-year transferable warranty on cracks, a clean review floor with zero one-star ratings, and a "less expensive than similar methods" model make Crack-X the targeted, lower-cost fix for a targeted problem. The 5.4-point five-star gap on the gauge is real but rests on Crack-X's 51-review base, where two reviews swing the number several points, so do not let it decide a question of scope.

The honest move is to diagnose first. Have the basement looked at, find out whether you have a drainage problem or a sealing problem, then buy the fix that problem needs and not a dollar more. Honest beats hype, and the cheapest job that actually keeps the water out is the one that wins.

Sources

• 603 Basement Solutions Google Business Profile (rating, full distribution, review themes), accessed June 2026: google.com
• Crack-X Google Business Profile (rating, distribution, review themes), accessed June 2026: google.com
• 603 Basement Solutions website (Forever Dry System, "Dry for Life" warranty, radon): 603basementsolutions.com
• Crack-X website (crack injection and bulkhead scope, 10-year warranty, "less expensive than similar methods"): crackx.com
• BBB accreditation status for both companies (603 A+ accredited 2022; Crack-X A+ not accredited, Manchester profile), accessed June 2026
• Homeowner statements on 603's least-invasive fixes and a reported quote, r/newhampshire, 2026: reddit.com

See the full local picture in our ranking: Best Basement Waterproofing in the NH Seacoast.