If you run a consultancy, the pattern is familiar: a few spreadsheets for utilisation, email threads for client updates, a separate tool for time and billing, and nothing that talks to anything else. Off-the-shelf consultancy software, or professional services automation as the category calls it, is meant to fix that. More often it relocates the mess and asks you to change how you work in the process.
The signs it has stopped working tend to arrive together. You cannot tell if a project was profitable until weeks after it closed. Invoices go out a fortnight behind because timesheets were approved late. A chunk of billable hours never gets captured at all, because someone reconstructed their week from memory on a Friday afternoon. And every new consultant adds another per-seat licence fee.
We build custom consultancy management software at ByteGears. We design it around the way your firm already runs, around your rate cards, your utilisation targets and your approval chain, not around what a SaaS vendor decided most consultancies need. You own the code, there are no monthly per-user fees, and our team is in London, so you can sit down with us to get the details right.
Why generic PSA software falls short
Packaged PSA tools tend to fail in a few predictable ways.
Rigid billing. Most platforms enforce a small set of billing models: simple hourly, tiered, fixed-fee. Real consulting has exceptions. Client A pays one rate for senior people and another for juniors. Project B is cost-plus with a margin guarantee. Project C has a holdback clause. The workaround is always a spreadsheet alongside the “system of record”, which defeats the point of having one.
Per-seat economics. Pricing commonly runs from around £15 per user per month at the budget end to £120 or more for the enterprise platforms, and some enforce minimum seat purchases. You can end up paying for fifty licences while using thirty. The bill also grows with every hire, so the tool quietly taxes your growth.
Integration gaps. Standard connectors cover the obvious accounting and CRM packages. They rarely cover a proprietary ERP, an older billing platform, or the multi-entity invoicing a growing firm needs. So data still gets copied between systems by hand, and the accounting ledger lags days behind reality.
UK compliance left to you. Most of the larger platforms are built US-first. IR35 contractor status tracking, MTD-compatible reporting, UK data residency and the six-year retention HMRC expects are either absent or handled through manual workarounds.
The result is wasted time on those workarounds, staff retrained on software that does not suit them, and revenue lost to slow, inaccurate billing.
Where SaaS is genuinely fine, and where it isn’t
We will say this plainly, because it matters. If your billing is straightforward, one rate per grade or a simple tier, you operate in a single region with no multi-currency complexity, your projects follow a predictable shape, and you are happy with monthly subscription costs, an off-the-shelf PSA tool is probably the sensible choice. It deploys fast and the per-seat cost is manageable at smaller headcounts.
A custom build earns its place when the standard tools start fighting you:
- Billing logic that does not fit preset models: multi-tier rates, performance bonuses, cost-plus, clawbacks, client-specific pricing
- Integration with a legacy ERP or proprietary billing system that has no pre-built connector
- UK compliance that needs to be built in, not bolted on: IR35, MTD, audit trails, data residency
- White-label delivery, where you offer the platform to your own clients under your brand
- Specialised workflows: subcontractor management with separate rate cards, multi-level approval gates, project-specific exceptions
- Operations that are themselves a competitive advantage, and you want that efficiency locked in rather than rented
What we build instead
We map your client management, project delivery, time capture and billing workflows before anyone writes code. Workshops and conversations with the people who do the work, not a questionnaire. Then we build software that supports those processes rather than replacing them.
You pay once. No recurring per-user licence fees. The software connects to the tools you already run, whether that is Xero or Sage for accounting, Microsoft 365 for collaboration, Salesforce or HubSpot for business development, or something specific to your sector. We build the integrations so an opportunity becomes a project and approved time becomes an invoice without anyone retyping it.
UK GDPR-compliant data handling, role-based access and audit trails are part of the build, not an afterthought. The system is modular, so you can add capacity forecasting, a client portal or contractor management later without rebuilding it. And support comes from London developers, not a distant call centre in another timezone.
What you get
Every project is different, but the system is usually built around a clear set of records, your consultants and their rates, projects and budgets, time entries, expenses, timesheets, invoices and clients, all connected. The features we commonly build on top:
- Time and timesheet capture across web and mobile, with quick entry to cut the hours that go untracked, and billable, internal and non-billable classification
- Rate cards that vary by consultant, client, project or skill, with cost rates held alongside billing rates so margin is calculated honestly
- Invoice generation from approved time and expenses, with VAT handling, partial billing and holdbacks, posted through to your accounting ledger
- Approval workflows with the gates your firm actually uses: consultant to manager to finance, with auto-escalation for overdue timesheets
- Utilisation and profitability reporting, by consultant, team, project and month, including chargeable versus non-chargeable hours and bench time
- Resource scheduling with a visual view of allocations, conflict detection for overlapping bookings, and capacity planning across a six to twelve month horizon
- Project budgets and margin tracking with early warning when costs run ahead of plan, rather than discovering it after the project closes
- Expense management with receipt capture, project allocation and reimbursement
- A client portal where it helps, giving clients project visibility and status without email chasing
- Contractor and IR35 support: status tracking, documentation, separate rate cards and payment terms for subcontractors
- Security and audit: encryption, permissions you define per role, locked records once approved, and audit trails on every time entry, approval and billing change
How the project works
The first two to three weeks are discovery. We document your processes, your rate logic, your approval chain and where you want the business to go, through interviews and workflow mapping rather than a form.
Then we build, in short cycles with regular demos so you see progress and can steer it. We deliberately keep the first release tight: time entry, project and consultant records, invoice generation, basic utilisation reporting and an accounting sync. A focused core like that is usually a three to four month effort, and it is enough to run on. Trying to solve every problem in phase one is one of the most common reasons these projects slip, so we resist it.
Before launch we test thoroughly, including having your own team run the system, and we reconcile the numbers against your current setup so you trust the data from day one. Rollout can be phased, running alongside your existing tools while people settle in.
A second phase, typically two to four months later, adds the heavier work: capacity forecasting, multi-currency or multi-entity billing, the client portal, custom approval gates, contractor management and BI integration. Most full projects land within three to six months. If something is urgent, we deliver the core first and add the rest later.
Data migration is usually the part firms underestimate. Historical time entries, duplicated consultant records, inconsistent rate histories and old ledger structures all need cleaning before they move. We plan that work explicitly so it does not derail the timeline.
What it costs
Custom development costs more upfront than a subscription. That is the honest trade-off. But you own the result, and the payments stop when the project is done.
The recurring PSA bill, anywhere from a few thousand pounds a year for a small team to well into six figures for a large one, disappears once you switch over. You can add consultants without moving up a pricing tier or migrating platforms. You are not exposed to a price rise when a vendor gets acquired, and there is no minimum-seat waste. Firms that move from scattered spreadsheets and disconnected tools to one coherent system commonly cut admin time noticeably, and bill faster and more accurately, which helps cash flow as much as cost.
Cost depends on scope, the number of integrations and how much compliance work is involved. Most SME consultancies find a custom build comparable to two or three years of subscription and seat fees, for something they own permanently rather than rent. We are happy to model that against your actual current spend. The initial consultation is free and there is no obligation.
Industries we work with
The shape of the system changes with the work:
- Management and strategy consultancies: partner-level versus junior rates, variable team composition, engagement and deliverable tracking, international and multi-currency billing
- IT and software consultancies: time and materials versus fixed-fee engagements, developer hours tracked against Jira issues, post-implementation support and warranty work
- Architecture and engineering firms: multi-phase delivery, project cost tracking across materials and subcontractors, multi-disciplinary resourcing, and the audit trails regulated work requires
- Accounting and tax practices: engagement tracking by service type, deadline and risk management, multi-service billing across advisory, compliance and bookkeeping
- Marketing and creative agencies: campaign coordination, creative workflows, capacity forecasting against the pipeline, and profitability per client
- Regulated sectors: financial advisers under FCA expectations, healthcare consultants working with NHS and care providers, and public sector work, where audit logs, conflict checks and UK data residency are not optional
Each one needs software that uses their terminology, fits their processes and meets their regulatory requirements, which is the one thing generic software cannot do.
Common Questions About Custom Consultancy Management Software for UK Firms
How does a custom build compare on cost to PSA subscriptions?
A custom build costs more upfront. The difference is what happens after. Per-seat PSA tools commonly run £15 to £120 per user per month, and several enforce minimum seat counts, so you can pay for licences nobody uses. A 50-person firm can spend well into five figures a year on PSA licensing alone, and that bill grows every time you hire. With a bespoke system you pay once for the build, own the result, and add users without the cost going up. Over a typical three to five year horizon, most SME consultancies find the numbers comparable. We will not promise a guaranteed payback date, but we are happy to model it honestly against your current spend.
What's a realistic development timeline?
We aim for a usable core in roughly three to four months: time entry, project and consultant records, invoice generation from approved time, basic utilisation reporting, and an accounting sync. More involved work, such as multi-currency billing, capacity forecasting, a client portal or custom approval gates, usually follows in a second phase. Complex integrations or compliance requirements can push the full scope past six months. We deliver in phases so you are billing and reporting on live data early rather than waiting for everything at once.
Can it handle our billing rules and rate cards?
That is usually the main reason firms move off packaged PSA. We build the billing logic your firm actually uses: rates that vary by consultant, client, project or skill; cost-plus arrangements with margin guarantees; retainers; holdbacks and clawback clauses; and segment-specific pricing. No spreadsheets bolted onto the side, no rounding your real model down to fit a vendor's three preset options.
Can you integrate with our accounting and CRM systems?
Yes. Common connections include Xero, QuickBooks and Sage for invoicing and ledger posting, Salesforce or HubSpot so an opportunity flows through to a project, and payroll systems for time-to-pay reconciliation. We can also build connectors to legacy or proprietary ERP and billing systems where no off-the-shelf integration exists, which is often where packaged PSA leaves firms doing manual reconciliation.
How do you handle UK compliance and contractor rules?
UK GDPR-compliant data handling, role-based access and audit trails are part of the build. We can keep data resident in the UK, lock approved timesheets and invoices so they cannot be changed retroactively, and retain records for the six years HMRC expects. Where you engage contractors, we can build in IR35 status tracking and documentation, and support MTD-compatible reporting. If you serve regulated clients we can align with ISO 27001 or sector-specific requirements.
What happens after launch for support and changes?
Every project includes 12 months of support and updates. After that you can move to a retained agreement or commission changes ad hoc. Because you own the code and the database, you are never locked in, and you are not exposed to a price rise if a SaaS vendor is acquired.
Do you train our team?
Yes, with sessions tailored by role: consultants on daily time and expense entry, project managers on budgets and reporting, finance on invoicing and month-end, resource managers on capacity planning. Time tracking adoption is the usual sticking point, so we focus on making entry quick on mobile and easy to keep on top of.