Salesforce is the default answer when a UK business decides it "needs a proper CRM." For good reason - Salesforce is the most-deployed CRM in the world, the partner ecosystem is enormous, and no one ever got fired for picking it. But "default" and "right answer" aren't the same thing, and for a meaningful chunk of UK businesses, a custom CRM is the better call.
Here's how the two compare honestly, and the specific scenarios where each one wins.
The head-to-head at a glance
| Dimension | Salesforce | Custom CRM |
|---|---|---|
| Upfront cost | Low (licences only) to mid (with implementation partner: £20k–£80k) | £18k–£120k+ build cost |
| Ongoing cost (50 users) | ~£100k/year Enterprise + add-ons + partner retainer | Hosting + retainer, often under £20k/year |
| Time to live | 2–6 months with partner | 2–7 months |
| Fit to your process | You bend your process to Salesforce. Customisation is possible but expensive. | Built around your process from day one. |
| Ecosystem | Huge AppExchange. Anything you want already exists. | None - you build or integrate everything you need. |
| Data ownership | You own data; it lives in Salesforce's schema. Export possible but migration is a project. | You own the database outright. Export is a button. |
| Lock-in | High. Apex/Lightning skills are Salesforce-specific. | Low. Standard tech stack, any developer can pick it up. |
| Speed of change | Slow - process changes mean re-configuring or consultancy. | Fast - describe it, ship it. |
| Compliance | Strong baseline (ISO, GDPR, sector-specific add-ons). | Custom - strong if built that way, weak if not. |
When Salesforce is the right call
We will, with a straight face, tell clients to use Salesforce when their situation fits. The honest scenarios:
- Standard enterprise sales process. You have account executives, opportunities, forecasts, quarterly close. Salesforce was designed for exactly this and does it well.
- You need it ready in eight weeks. A good Salesforce partner can stand up a configured org faster than any bespoke build.
- You're under 25 users and likely to stay there. Per-seat pricing is still survivable, and the upfront saving over custom is real.
- You depend on a specific AppExchange product. If your industry has a dominant Salesforce-native vertical app (financial services, certain field-service verticals), the ecosystem advantage is decisive.
- You're selling to a market where Salesforce is a tick-box. Enterprise procurement teams sometimes require it.
When a custom CRM beats Salesforce outright
The cases where bespoke wins are also clearer than people think:
- Your operation isn't sales-first. If your CRM is really an operational platform - job scheduling, asset tracking, hospitality revenue, fleet, property - Salesforce is the wrong shape and you'll pay to bend it.
- You're 50+ users with a stable process. Per-seat pricing crosses the line where custom is cheaper outright, often before year two.
- Customers, contractors or partners use it too. Salesforce community licences are expensive. A custom portal is a one-off cost.
- You change your process frequently. Iterating on a custom system is a developer day. Iterating on Salesforce is a consultancy ticket.
- You want the software to be part of the product you sell. Your customers shouldn't see Salesforce branding or workflow.
- You need deep integration with niche kit. Telematics, weighbridges, fuel pumps, EPOS, in-house manufacturing - the bespoke route is faster to ship and cheaper to maintain.
The honest 5-year cost comparison
Take a 50-user business with three integrations and a customer portal. Rough five-year totals at UK list pricing (see Salesforce's published UK pricing for current Enterprise edition numbers):
| Line item | Salesforce route | Custom CRM route |
|---|---|---|
| Licences (50 × Enterprise, 5 yrs) | ~£500,000 | £0 |
| Implementation | £40,000 | £60,000 (build) |
| Customer portal (community licences vs custom) | £60,000+ | Included |
| AppExchange add-ons | £25,000 | £0 (built in) |
| Partner retainer (5 yrs) | £75,000 | £60,000 (Nimble IO retainer) |
| Hosting (5 yrs) | Included | £12,000 |
| Total over 5 years | ~£700,000 | ~£132,000 |
That's a real, repeatable pattern at this size. It's also why we wrote a separate post on what a custom CRM actually costs with three worked examples by team size.
The hidden trade-offs
It's only fair to call out where Salesforce keeps an edge that the spreadsheet won't show:
- You can hire for it. Salesforce admins are a known job spec. Custom CRMs need a developer (us, or someone like us) on retainer.
- The ecosystem is genuinely huge. If you need it, it probably exists already.
- Compliance baseline is strong. If you're regulated, you don't have to argue with auditors about your CRM - Salesforce holds ISO 27001 and a long list of sector-specific certifications. Custom systems can match this but it has to be built in deliberately. Worth checking the ICO's UK GDPR accountability guidance when planning either route.
- Resale and acquisition optics. Acquirers often prefer to see a recognisable SaaS stack on due diligence.
Conversely, custom CRMs come with their own honest trade-offs: you need a trusted development partner, you can't swap them out overnight, and you carry the responsibility of keeping the system patched.
Our honest take
If you're a sales-led, sub-25-person organisation that needs a CRM live before the next sales kickoff, use Salesforce. If you're operations-led, 50+ users, change your process every six months, or your CRM is also your product - a custom CRM will be cheaper, fit better, and ship faster than people expect.
If you're somewhere in between, we'd rather talk it through than sell you the wrong answer. We've recommended Salesforce to clients before. We've also rebuilt several Salesforce orgs as custom systems when the per-seat maths stopped working. Get in touch if you'd like an honest read.