A project can look profitable in the proposal and still lose money quietly. The usual culprit is not one dramatic overspend. It is unrecorded client calls, vague timesheets, scope creep hidden in email, and hours assigned to the wrong job after someone tries to reconstruct their week on Friday. The best tools for project costing make that leakage visible while there is still time to act.
For UK professional services firms, project costing software is not simply a finance tool. It is the operating system behind sensible pricing, accurate invoices and defensible margin decisions. But different tools solve different parts of the problem. A construction firm may need detailed job cost controls; a design studio may need dependable billable-time capture; a larger consultancy may need both, alongside resource planning and accounting data.
What project costing software must actually do
A credible costing system should bring together the costs that determine whether a project made money: labour, subcontractors, expenses, materials where relevant, and committed future costs. It should then compare those figures with the budget, agreed fees and forecast completion position.
That sounds straightforward. In practice, labour is where most service firms lose control. Salary figures are easy to load into a system. Knowing which client received six hours of a consultant’s work is much harder when capture relies on manual timers and retrospective timesheets. If the source data is incomplete, every profitability dashboard is polished guesswork.
The right choice depends on your delivery model. Agencies and advisory firms should prioritise client-level time accuracy and budget alerts. Architects, engineers and construction-adjacent businesses often need stronger project financials, purchasing and cost-code structures. Firms running complex portfolios may need enterprise resource planning capabilities, but should be cautious about buying a heavyweight platform when their immediate problem is poor time data.
8 best tools for project costing
| Tool | Best for | Where it earns its place | Watch-out | | — | — | — | — | | eppiq Timer | Automated client time allocation | Capturing billable work without timer compliance | Not a full ERP or purchasing system | | Harvest | Smaller teams wanting simple tracking | Straightforward time, budgets and invoicing | Still depends heavily on manual entries | | Forecast | Agencies needing planning and costing | Resource scheduling, rates and project financials | Requires disciplined setup and maintenance | | Productive | Growing agencies | Budgets, resourcing, profitability and operations | Can be more system than a small firm needs | | Float | Resource-led planning | Capacity, staffing and planned project costs | Needs reliable actual-time data alongside it | | Kantata | Larger professional services firms | PSA controls, forecasting and portfolio visibility | Enterprise rollout can be demanding | | Deltek | Architecture, engineering and project firms | Deep project accounting and cost management | Often excessive for lighter service workflows | | Sage Intacct | Finance-led organisations | Financial control and project accounting | Time capture may need a complementary tool |
eppiq Timer: best for recovering missed billable time
Most project costing platforms assume people will remember to start a timer, stop it, select the right client and complete a timesheet later. That assumption is the flaw. Busy professionals move between documents, browser tabs, calls, spreadsheets and client systems all day. They forget, then managers spend Friday chasing a version of events.
Eppiq Timer takes a different route: Client Time Intelligence identifies work patterns and allocates work to the appropriate client without depending on constant manual timer behaviour. For firms whose work happens mainly on screen, this directly improves the labour-cost data feeding project profitability. The commercial value is simple: fewer forgotten hours, more accurate invoices and a clearer view of which clients consume more time than they pay for.
It is particularly useful when you already have accounting or project-management software but cannot trust the time entries going into it. It will not replace specialist procurement, construction cost codes or a full finance platform. It solves the earlier, more fundamental problem: capturing the work in the first place.
Harvest: best for uncomplicated teams with strong habits
Harvest remains a familiar choice for small consultancies, freelancers and agencies that want basic time tracking, expense recording, budgets and invoicing in one accessible product. Its appeal is clarity. Teams can get started quickly, project owners can see budget consumption, and billing workflows are not buried beneath enterprise configuration.
The trade-off is behavioural. Harvest works well when staff consistently log time as they go. Where work is fragmented and teams complete entries at the end of the week, the numbers can become estimates rather than evidence. Use it if simplicity matters and time-tracking discipline is already high. Do not expect the tool alone to fix a culture of missing timesheets.
Forecast and Productive: best for agencies managing margins
Forecast and Productive are built around a problem agencies understand well: winning work is not the same as delivering it profitably. Both bring project budgets, fee tracking, people costs, resource planning and reporting closer together, so leaders can see a squeezed margin before the project closes.
Forecast is often a good fit where resourcing is central to delivery. It helps teams connect planned effort with delivery activity and capacity. Productive is compelling for agencies that want a broader operational platform covering sales, budgeting, resourcing and profitability.
Neither should be selected merely because it produces attractive margin reports. Their value depends on sensible rates, clean project structures and accurate actuals. If people do not record their work properly, planned-versus-actual comparisons will still mislead you. Pair either platform with a time-capture approach that does not rely on memory.
Float: best for planned labour cost and capacity
Float is primarily a resource-planning tool rather than a complete costing system. That distinction matters. It helps managers allocate people, understand availability and model the cost of scheduled work before delivery begins. For a studio or consultancy regularly deciding whether to recruit, use a contractor or move people between accounts, this is valuable information.
Its limitation is also clear: plans are not actuals. A schedule might show a designer assigned to a client for three days, while the real week is disrupted by urgent amendments, internal meetings and another client escalation. Float is strongest when it sits alongside dependable actual-time and financial data, not when it is treated as proof of cost incurred.
Kantata, Deltek and Sage Intacct: best for deeper financial control
Larger organisations with formal project controls often need more than a time tracker and a budget screen. Kantata provides professional services automation capabilities for portfolio-level resource, project and financial management. It suits firms with multiple teams, complex approvals and a need to forecast revenue and delivery across a large book of work.
Deltek is a serious contender for architecture, engineering and other project-centric businesses that require detailed project accounting, labour controls and operational reporting. Its depth can be justified where governance, cost codes and contract requirements are substantial.
Sage Intacct appeals to finance leaders who want project accounting connected to core financial management. It can give finance teams better control over project revenue and costs, particularly in organisations outgrowing basic accounting packages.
These platforms have a common risk: implementation effort. More fields, workflows and controls do not automatically mean better cost visibility. They can create a sophisticated reporting layer on top of weak source data. Establish how labour time will be captured, validated and assigned before committing to an enterprise rollout.
How to choose project costing software without buying twice
Start with the decision you need to make every week. If you need to know whether a fixed-fee client is drifting over budget, prioritise actual labour capture, live budget burn and client-level reporting. If you need to protect utilisation and allocate the right people to work, add resource planning. If you need auditable project accounting, look for finance integration, approval workflows and cost-code depth.
Then test the data journey, not just the demo dashboard. Ask how a consultant’s work becomes a cost against a specific project. Ask what happens when they switch clients ten times a day, work in offline software, or forget their timesheet. Ask whether managers can distinguish billed time, billable but unbilled time, write-offs and non-billable delivery effort. Vague answers here are expensive.
Pricing matters too, but licence cost is rarely the largest cost. A cheaper tool that requires persistent manager chasing can cost more in lost billable time and administration than a higher-priced system that captures work accurately. Equally, do not buy an enterprise suite for a 12-person agency that needs a reliable view of client profitability. Complexity has a carrying cost.
The costing metric that matters: margin before it is final
Many firms review project profitability after invoicing, when the learning is useful but the margin is gone. Better costing gives project leads an early warning: budget consumed versus work completed, remaining hours versus remaining fee, and actual labour cost versus the original delivery plan.
That changes the conversation. Instead of asking why a completed project lost money, managers can renegotiate scope, rebalance staffing, pause non-essential work or have an honest conversation with the client while there is still commercial room to move.
Choose software that reflects how your people really work, not how a vendor hopes they will work. Accurate costing starts with accurate evidence. Once that evidence is automatic and trustworthy, every budget, invoice and profitability decision becomes harder to argue with.