What does a custom CRM cost? A real-world breakdown for UK businesses

"How much does a custom CRM cost?" is a fair question that almost every agency answers with "it depends." It does depend - but you can absolutely get within the right ballpark before you ever pick up the phone. This post breaks down the cost drivers, shows where prices start, and walks through the real-world brackets we see most often - with what's actually inside each.

What you're actually paying for

A custom CRM cost isn't really about lines of code. It's the sum of five things:

1. Scope - how many distinct things the system does (leads, quotes, jobs, invoices, reporting, customer portal, etc.).
2. Integrations - every external system you need to talk to: accounting, email, SMS, payment gateways, calendar, telephony, parts catalogues.
3. Roles and permissions - a single-role CRM is dramatically cheaper than one with admins, managers, field staff, customers, and contractors who each see different things.
4. Data complexity - clean migrations from spreadsheets are quick; importing from legacy CRMs with three years of inconsistent data takes real work.
5. Design and UX polish - an internal back-office tool can be plain; a customer-facing portal can't be.

Hosting, support and ongoing development are separate ongoing costs - usually £150 to £1,500 per month depending on size - but the build is what most people are asking about.

The price brackets we see most often

From £4,000 - a starter CRM for a small team

Not every business needs a big platform on day one. If you're a small team replacing a single spreadsheet or a pile of notes, a focused starter build covers the essentials without the price tag:

• Contacts, companies and a simple pipeline.
• Notes, tasks and file attachments.
• One core workflow - the thing you do every day - done properly.
• A single user role, with room to grow.

Build time is usually a few weeks, with little or no third-party integration at this level. It won't do everything at once, but you get a clean system you own outright and can extend in phases - for less than a year of most per-seat SaaS subscriptions.

£18,000 – £35,000 - a focused single-team CRM

This is the right bracket if you're a team of 5 to 15 trying to escape a shared spreadsheet. Typical scope:

• Leads, contacts and companies.
• Quotes or proposals with PDF output.
• A simple pipeline view with stages.
• Notes, attachments, tasks.
• One or two integrations - usually Xero or QuickBooks plus email.
• A single user role with sensible defaults.

Build time is usually 8 to 14 weeks. You end up with something that does exactly your job and nothing else - fast, focused, easy to train new staff on. We've shipped systems at this scale that paid for themselves in under a year just by removing duplicate data entry.

£35,000 – £75,000 - a connected operational platform

This is the bracket most growing businesses land in. You're 15 to 60 people, you have several departments using the same data differently, and you need integration to feel like the system is the workflow, not a separate chore. Typical scope:

• Full sales pipeline plus delivery/operations.
• Job scheduling or asset tracking.
• Invoicing tied to actual work done, synced to Xero or QuickBooks.
• 4–8 integrations - accounting, email, calendar, SMS, payment gateway, possibly mapping or geofencing.
• Multiple roles with proper permissioning.
• Dashboards and management reporting.
• Mobile-friendly screens for field staff.

Build time is typically 4 to 7 months. The TyreOps and HoseFleet case studies are both real examples in this bracket. Five-year ROI almost always beats per-seat SaaS at this size.

£75,000 – £120,000+ - a multi-stakeholder platform

This bracket is for businesses where the CRM is also a product - a customer portal, a partner network, a contractor app - not just an internal tool. Typical scope:

• Everything in the previous bracket, plus:
• External-facing portal for customers, partners or contractors.
• Native or PWA mobile apps for field/site teams.
• Complex business logic (pricing engines, allocation algorithms, automated scheduling).
• Real-time data feeds - IoT, telematics, point-of-sale.
• Advanced reporting and BI integration.
• Strict compliance, audit logging or accreditation requirements.

Build time is 6 to 12 months, often phased so something useful ships in month three and value compounds from there. Merit Hotels is an example - a revenue management platform that replaced spreadsheets across multiple properties and cut admin time by 60%.

What pushes the number up

Three things move projects up a bracket faster than anything else:

• Unclear scope at the start. Every "oh, and could it also…" adds time. We mitigate this with a fixed scoping phase before any quote.
• Integrations with closed or badly documented APIs. A well-documented modern API takes days. A 2008-era SOAP service with poor docs can take weeks.
• Data migration from messy legacy sources. Cleaning and reconciling old data is often more work than building the new system.

What pushes the number down

• Start with one user role. Add others in phase two when you actually know what they need.
• Cut the dashboard. For now. Most "wishlist" reports are never opened. Ship the workflow first.
• Use what's already there. If you already have Xero and Stripe, integrate - don't rebuild billing.
• Phase it. A 4-month MVP that earns its keep funds the next 8 months of features. We almost always recommend this over a single 12-month build.

Ongoing costs to factor in

The build is one-off. The running costs are not. Expect:

• Hosting: £30 to £400 per month depending on traffic, data volume and uptime needs.
• Third-party services: email delivery, SMS, telephony, mapping - these usage-based.
• Support and small changes: £150 to £1,500 per month on retainer.
• Phase-two development: budget 15–25% of build cost per year for genuine new features.

For comparison, a 50-seat Salesforce Enterprise licence at current UK list pricing is roughly £100,000 per year - and that's before any customisation, consultancy or AppExchange add-ons. We cover the full Salesforce comparison in Custom CRM vs Salesforce: when each one wins.

Worth knowing: bespoke software development can also qualify for UK R&D tax relief when the work meets HMRC's qualifying-activity definition. Talk to your accountant - it can take a meaningful chunk off the effective cost.

How we quote at Nimble IO

We don't do vague estimates. After a free discovery call we either give you a fixed-price quote or we tell you why we can't yet - usually because the scope needs another conversation. We charge for the scoping phase only if you decide not to build, and we credit it back if you do.

If you'd like a real number for your project - not a brochure range - get in touch and tell us what you're trying to solve. We'll come back with honest brackets and what's inside each.