Everything a property developer needs
Marginly combines deal appraisal, project management, budget tracking, and team collaboration in one focused tool for small UK developers.
Know if a deal stacks in minutes, not hours
Marginly's deal appraisal engine covers every cost in a UK property development deal. Enter the purchase price and the calculator automatically computes SDLT (including the 5% surcharge on additional dwellings), legal fees, broker fees, build costs by project type and m², professional fees, contingency, development finance, and selling costs. Every number updates live as you type.
- Automatic 2025/26 SDLT calculation with additional dwelling surcharge
- Build cost presets for light refurb, heavy refurb, conversion, and new build
- Development finance modelling with LTV, monthly rate, arrangement and exit fees
- Gross profit, margin on GDV, ROI, and profit on cost
- Colour-coded health indicator (Strong / Decent / Tight / High Risk)
- Save up to 10 named scenarios per project
- Side-by-side scenario comparison
- PDF export for lenders, investors and JV partners
Keep the build programme on track
Once you've secured a deal, switch to project mode. Marginly's project timeline lets you plan every phase of the development — from exchange through planning, groundworks, superstructure, first fix, second fix, and completion. Set start dates, durations, and milestones. Assign tasks to team members. See the whole programme at a glance on a Gantt-style view.
- Gantt-style timeline view with phase-level detail
- Built-in UK development phase template
- Drag-and-drop task scheduling
- Milestone tracking with completion status
- Team member assignment per task
- Dependencies and critical path
- Export timeline as PDF
Know where every pound is going
Set your budget by category at the start of the project and log every invoice as it comes in. Marginly shows you a running comparison between budget and actual spend across acquisition, build, finance, professional fees, and selling costs. Never be surprised by an overrun again. Drill down into any category to see individual invoices, and flag items that need sign-off.
- Category-level budget vs. actuals comparison
- Invoice logging with date, payee, and category
- OCR invoice scanning — photograph and extract automatically
- Budget variance alerts
- Cash position tracking
- Payment status (paid / outstanding / overdue)
- Spend reports exportable to CSV or PDF
See your cash position month by month
Development projects are cash-hungry. Marginly's cashflow forecasting tool models your expected cash in and out for every month of the project. See when you'll need drawdowns from your lender, plan for VAT payments, and make sure you're never caught short. Run scenarios to stress-test your position if the build runs over or sales are delayed.
- Monthly cashflow forecast for the full project duration
- Lender drawdown schedule
- VAT cashflow modelling
- Sensitivity analysis (build cost overruns, sales delays)
- Minimum cash balance alerts
- PDF cashflow report for lender submissions
Every document in one secure place
Keep all your project documents in a secure, organised vault. Planning consents, building regulations approvals, structural engineer reports, contractor warranties, insurance certificates, land registry documents — everything in one place, accessible from anywhere, searchable in seconds. Never dig through emails looking for a document again.
- Organised folders by document type
- Full-text search across all documents
- Version history on key documents
- Expiry tracking (insurance, warranties)
- Share links for specific documents
- Download all as ZIP
Bring your whole team into the project
Marginly is built for small teams. Invite your project manager, architect, accountant, quantity surveyor, accountant, or JV partner. Set permission levels so each person only sees what's relevant to them. Your PM gets full edit access; your investor gets read-only access to the financials. Everyone stays aligned without endless email chains.
- Invite team members by email
- Three permission levels: view, edit, admin
- Per-project access control
- Activity log showing who changed what
- Team notifications for key milestones
- External sharing links with expiry
Ready to try Marginly?
Start with the free calculator — no account needed. Sign up when you're ready to save your deals.