603 Basement Solutions vs Erickson Foundation Solutions

For a New Hampshire basement, our top pick between these two well-rated companies is 603 Basement Solutions, on the criteria that decide whether a waterproofing job holds up: a cleaner proportional review record, a system the company owns and answers for under one name, and the strongest local-accountability fit. That is a top-pick call, not a knock on the rival. Erickson Foundation Solutions is a genuinely strong, family-owned Hudson firm that carries the larger review base and real depth in radon work, and we say so plainly below. The clearest factual difference is the system itself: Erickson installs the national Basement Systems and Foundation Supportworks product line (TripleSafe, SaniDry, WaterGuard) rather than a system it brands itself, while 603 owns and installs its self-branded Forever Dry System (per each company's own website, 2026). On Google, 603 Basement Solutions holds 4.9 stars across 250 reviews and Erickson holds 4.8 across 676 (2026). Here is how they compare, with sources, and where each one leads.

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

At a glance

What homeowners report

This is the part most comparisons skip, so it is where we spend the most time. We read the full Google rating distribution for both companies, not just the headline star average, because a 4.8 and a 4.9 can hide very different stories underneath.

Start with depth versus proportion. Erickson has the larger base by a wide margin: 676 Google reviews to 603's 250 (Erickson on Google; 603 on Google, 2026). More reviews means more signal, and a homeowner should weight that. But the shape of each distribution tells you something the average alone does not. On the listing snapshot we recorded, 603 shows 243 five-star ratings and only 2 one-star out of 249 (603 on Google). Erickson shows 624 five-star, which is excellent, alongside 25 one-star, 2 two-star, and 5 three-star out of 676 (Erickson on Google). Run the proportions and the picture sharpens. Roughly one Erickson review in 27 is a one-star; for 603 it is closer to one in 125. Both companies make a lot of customers happy. 603's negative reviews are simply rarer relative to its total, which is what we mean by a cleaner proportional distribution.

The themes inside those reviews diverge in a way that matches the system difference. Erickson's most-mentioned topics center on the installed product itself and on radon: basement (160 mentions), system (105), radon mitigation (58), sump pump (48), dehumidifier (24), and crawl space (16) (Erickson on Google). That "system" cluster and the 58 radon mentions are a real strength, and they line up with Erickson being a National Radon Defense contractor (ericksonfoundations.com). 603's top themes lean toward the service relationship: sump pump installation (30), radon mitigation (29), basement waterproofing (21), quick response (20), courteous staff (18), and estimate (18) (603 on Google). The "quick response" and "courteous staff" mentions are the no-pressure, responsiveness signal showing up in the data rather than in marketing copy. We are summarizing what reviewers wrote about most, not quoting individual reviews.

There is also a cost story that lives outside Google, and it should be read carefully. On a public r/newhampshire thread, a homeowner reported that Erickson quoted $40,000 for the same interior-drain-plus-sump scope that 603 quoted at $16,000 (thread). In the same thread, another homeowner reported that Erickson's proposal involved filling in a working grandfathered-in gravity drain and replacing it with a sump, bundled with a discount on a maintenance subscription (thread). Those are statements from individual homeowners about their own projects, not Erickson's standard pricing, and a single quote reflects one home, one inspection, and one proposed scope. We cite them as homeowner reports, because that is what they are. They are worth asking about at quote time, not a price list. The same thread, notably, has several unprompted homeowners describing 603 as the company that proposed the least-invasive correct fix rather than the biggest job (thread), which is the qualitative version of those "quick response" and "courteous" review themes.

One more reading note, because it comes up. Erickson's Yelp listing shows 3.3 stars on just 19 reviews (2026), which looks jarring next to its 4.8 on 676 Google reviews. That divergence is a small, filtered sample on a low-traffic platform rather than a quality measure, and it should not be read as one. The 676-review Google profile is by far the better signal of how the company performs day to day.

The biggest difference: a self-branded system vs a national product line

This is the comparison that matters most, and it is a verifiable fact rather than a swipe. Erickson installs the national Basement Systems and Foundation Supportworks product brand. The names that appear on an Erickson proposal, TripleSafe, SaniDry, and WaterGuard, are products from that national dealer network rather than a system Erickson designed and brands itself (ericksonfoundations.com). 603 Basement Solutions takes the other approach. It owns and installs its self-branded Forever Dry System, a full perimeter drainage setup paired with a sump pump, a wall vapor barrier, and a dehumidifier, designed and warrantied under its own name (603basementsolutions.com).

Neither approach is automatically better, and we will not pretend otherwise. A national product line brings national research, development, and a recognizable brand, and Erickson's review themes show customers value that installed system. A self-branded local system means the company that designed it is the same one that answers the phone about service later. The homework is identical either way. Get the written scope and the written warranty, and read exactly what is covered.

Why this matters in New Hampshire: Seacoast and southern NH basements deal with a high water table, spring snowmelt that saturates the ground for weeks, and hydrostatic pressure pushing water up through the slab and the cove joint. Many older homes here sit on fieldstone foundations that move with the freeze-thaw cycle. The fix that tends to hold up is an interior perimeter drain tied to a reliable sump pump, relieving the pressure rather than fighting it. Both companies install exactly that. The real question is the scope each one proposes for your specific water problem, which is why the homeowner reports about over-engineered proposals are worth weighing against the system label.

Warranty and radon

Both carry a transferable warranty, and both back it with an A+ BBB record. 603 publishes a named "Dry for Life" transferable guarantee on its site, though the exact written contract terms are worth confirming at quote time (603basementsolutions.com). Erickson offers a transferable written warranty as well, with the duration not stated on its public site, so ask for the term in writing. On the BBB, Erickson holds A+ with accreditation since 2015 and a clean complaint history, two complaints closed in three years, which is a genuinely strong record and a point in its favor. 603 holds A+ accredited since 2022. A lifetime or transferable warranty, from either company, is only as good as how fast someone comes back when the basement leaks again. That single question favors the local-accountability model, but it is fair to ask of both.

Radon is the clearest place Erickson leads on depth. It is a National Radon Defense contractor, and radon mitigation shows up 58 times in its review themes (ericksonfoundations.com; Erickson on Google). 603 offers radon mitigation in-house and it appears 29 times in its review themes (603 on Google), so radon is a real part of what 603 does, but Erickson carries the deeper documented track record. If radon is your primary concern, that depth is worth weighing.

Pricing and service

Like nearly every waterproofer, neither company publishes fixed prices online. Both quote after a free in-home inspection, because the number depends on the basement's perimeter, the source of the water, and the fix. For rough national planning only, independent guides put an interior perimeter drain plus sump at roughly $4,000 to $15,000 (This Old House; national, not NH-specific). Treat that as a national range rather than a quote.

When two quotes land on your table, compare them on the same four things rather than the bottom-line price alone. First, scope: is each company solving the actual water problem, or proposing extra work, like replacing a drain that already works, that the water issue does not require? The homeowner-reported gravity-drain replacement above is exactly the kind of scope question to raise. Second, the system and warranty: what is the named system, how long is the warranty, what does it cover, and does it transfer if you sell? Third, responsiveness after install: ask both how service calls are handled and how fast someone returns. Fourth, verified reviews: read recent Google reviews for both, and weight depth and recency over a single star number. If one proposal is far larger than the other for the same wet basement, that is not automatically wrong, but it is the first thing to ask about.

How they net out

Our pick

Our pick is 603 Basement Solutions, as the strongest local fit on the criteria that matter for a job meant to last decades: the cleanest proportional review distribution of the two, review themes built on responsiveness and no-pressure service, a named system the company designs and answers for itself, a published transferable warranty, broad scope including radon, and direct local accountability when something needs service. That is a top-pick judgment, not a superlative. To be clear about what 603 is not: it is not the highest-rated waterproofer in the area, since Reliable Basement Waterproofing carries a 5.0, and it is not the most-reviewed, since Erickson's 676 reviews and Groundworks' larger base both exceed it.

And Erickson Foundation Solutions genuinely leads in two places. It has the larger review base by a wide margin, which is real signal, and it has deeper documented radon depth as a National Radon Defense contractor with a clean BBB record. A homeowner who wants a national product line backed by national research, the reassurance of a large review base, or proven radon work has a legitimate choice in Erickson. The honest move is to get a free inspection and a written quote from both, then compare scope, warranty terms, and response-time promise side by side. Honest beats hype, and it is usually the comparison that holds up after the crew leaves.

Sources

• 603 Basement Solutions Google Business Profile (rating, full distribution, review themes), 2026: google.com
• Erickson Foundation Solutions Google Business Profile (rating, full distribution, review themes), 2026: google.com
• r/newhampshire homeowner thread (homeowner-reported quotes and proposal details for Erickson and 603), public, 2026: reddit.com
• Erickson radon page (National Radon Defense contractor), accessed 2026: ericksonfoundations.com
• Erickson website (system and product brand), accessed 2026: ericksonfoundations.com
• 603 Basement Solutions website (Forever Dry System and warranty), accessed 2026: 603basementsolutions.com
• Company ratings, Yelp divergence, BBB accreditation and complaint counts: Google and Yelp Business Profiles and BBB profiles, 2026
• This Old House (national interior-drain-plus-sump cost range)

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