Your London agency runs Salesforce, Harvest, and Xero, and none of them agree on what a client owes
Custom CRM (Customer Relationship Management) development in London runs £55k to £160k over 4 to 7 months. You build custom when the gap between your CRM, your time-tracking, and your billing is where your account managers lose their week. For a London agency or professional-services firm, the win isn't a prettier pipeline; it's a CRM that knows the difference between hours sold, hours logged, and hours invoiced, so reconciliation stops being a Friday afternoon ritual.
You run Salesforce or HubSpot for the pipeline, a separate time-tracker for delivery, and Xero for billing, and the seams between them are exactly where the money leaks. Your account managers spend hours each week exporting timesheets, matching them to engagements, and rebuilding the picture of what each client actually owes against what was scoped. The CRM tracks the deal beautifully and then forgets the client exists the moment work starts.
Zoho and Pipedrive are fine for chasing new business, but they have no concept of a retainer burning down, a milestone unblocking an invoice, or a disbursement that needs passing through to the client. So your most expensive people, the senior account leads who should be deepening relationships, are instead reconciling project hours against billing in a spreadsheet. That's the specific London pain: client work stitched across disconnected systems, and the reconciliation tax falling on the people you can least afford to have doing data entry.
What breaks first in London
- Account managers spend 4 to 6 hours a week reconciling timesheet hours against scoped budgets and invoices
- Salesforce tracks the deal but loses the client once delivery starts; retainer burn-down lives elsewhere
- No single view of hours sold vs logged vs invoiced, so over-servicing is invisible until the project loses money
- Recoverable disbursements get missed or passed through late because the CRM doesn't model them
The fix: crm built for London, not rented
A London agency's relationship doesn't end at the closed deal; that's where the real work and the real margin risk start. A custom CRM models the full lifecycle the way you actually run it: pipeline, retainer or scope, time burn-down against budget, milestone-triggered billing, and disbursement pass-through, all in one place. Your account managers see a client's true commercial state at a glance instead of rebuilding it from three exports. The reconciliation that eats Fridays becomes a number that's already correct.
What crm costs in London
| Project scope | Typical cost | Timeline |
|---|---|---|
| Custom CRM with time-to-billing reconciliation | £70k to £130k | 5 to 7 months |
| CRM layer integrating existing Salesforce, time-tracking, and Xero | £45k to £85k | 3 to 5 months |
| Retainer burn-down and disbursement module only | £30k to £55k | 2 to 3 months |
The capability list that earns its budget
CRM services we deliver in London
The engagements London teams bring us most often: sales pipeline automation, lead management system, CRM API integration, marketing automation and Salesforce development.
Exactly what you get
A CRM built around the London agency lifecycle: a single engagement record that carries the deal, the scoped budget, the logged hours, the milestone billing, and the disbursements. Time flows in from your tracker without an export. Burn-down updates live so you catch over-servicing before it costs you. Invoices fire to Xero when milestones clear. Your account managers open one screen and see exactly where a client stands commercially, instead of rebuilding that picture every Friday from three systems.
How to choose a developer in London
Pick a team that has integrated CRMs with time-tracking and accounting before, because the integrations are where these projects succeed or quietly fail. Ask them to map your hours-sold-to-hours-invoiced flow on a whiteboard in the first meeting; if they reach for a generic pipeline diagram, keep looking. The right partner has shipped this for a services firm and can name the time-trackers and accounting tools they've wired together. Plan the CRM alongside your accounting software, business intelligence dashboard, and project management software so client data flows cleanly end to end.
- !They demo a pipeline and call it done; ask how they model retainer burn-down and disbursements
- !No integration experience with your specific time-tracker; ask which ones they've synced before
- !They want to replace Xero too; ask why they won't integrate the accounting you already run
- !Vague on milestone billing logic; ask them to whiteboard your worst reconciliation case
- !They quote without seeing your time-to-invoice gap; ask for a workflow audit first
Teams investing in crm in London usually scope it next to mobile app, website, pos, since these systems share data and budgets.
Rohan advises mid-market and enterprise teams on ERP, CRM and custom software, and has led delivery on dozens of business-software builds.
Writes for Digital Heroes, shipping business software for 2,000+ brands across 55+ countries since 2017.
Frequently asked questions
Should we replace Salesforce entirely?
Not always. If Salesforce's pipeline works for you, a custom layer that adds retainer burn-down, time reconciliation, and milestone billing on top is cheaper and lower-risk than a full replacement. Replace only if Salesforce's licensing or rigidity is itself the problem.
How does this stop account managers reconciling hours by hand?
By making the CRM the place where hours sold, logged, and invoiced all live on one engagement record, fed automatically from your time-tracker. Reconciliation becomes a number that's already correct rather than a weekly export-and-match exercise.
What does retainer burn-down actually track?
It tracks logged hours and costs against the scoped retainer in real time, so you see how much of the month's budget is consumed and get warned before you over-service the client into a loss. Off-the-shelf CRMs have no concept of this.