Excel & files

Your work comes with you.

Build on the work you already hold. Edit supported assumptions in Excel, review an imported model or bring the documents behind your financial case. The desktop add-in is in testing.

Explore Feasly with your project

Feasly for ExcelEdit · Review · Recalculate

From a cell to a financial consequence

Your spreadsheet.
Connected to the outcome.

Watch a construction-cost change move from Excel into the model, then back into the results.Interactive illustration · Foundry Yard

Start in familiar cells.

Explore a 10% construction-cost increase across three rates and the remediation allowance.

Foundry Yard.xlsxIllustrated workbook

C6ƒx2600GBP / m²

Construction assumptions · saved Base
Assumption	Base	Workbook
6Phase 1 apartments/ m²	2,600	2,600
7Phase 2 apartments/ m²	2,300	2,300
8Sold workspaces/ m²	2,300	2,300
9Remediation & servicesfixed	3,600,000	3,600,000

＋ConstructionResults

Base inputsLinked to Feasly

Connected

Your saved starting point

Base development profit£2.79m

Construction costs: £25.72m
Finance costs: £1.13m
Scenario: Saved Base

Start with the Base, then try a construction-cost increase in the workbook.

Fictional example before tax. Explore saved Base and Construction +10% results; this illustration does not edit a workbook or calculate a new appraisal. Add-in in testing.

Inside the connected workbook.

Your assumptions and the Feasly add-in, together.

01 / Edit a construction rate

Phase 1 apartments in Foundry Yard use a construction rate of £2,600 per m².

02 / Review with Feasly

The connected add-in keeps the selected model and review controls beside your workbook.

Foundry Yard cost assumptions in Microsoft Excel beside the connected Feasly add-in, with Foundry Yard selected and Pull model and Review changes controls visible — Foundry Yard · Cost assumptions and the connected Feasly add-in · Illustrative modelOpen full view

Full-size: Foundry Yard cost assumptions in Microsoft Excel beside the connected Feasly add-in, with Foundry Yard selected and Pull model and Review changes controls visible — Foundry Yard · Cost assumptions and the connected Feasly add-in · Illustrative modelOpen full view

Your spreadsheet.
A connected financial case.

Open the Feasly add-in to edit assumptions in Excel. Review the changes, then apply them to your Feasly model for recalculation. An assumptions workbook gives you another way to take editable inputs into Excel and bring reviewed changes back.

01Edit in Excel
Work with the defined assumptions in your workbook.
02Review the change
Inspect what will be applied to the Feasly model.
03Recalculate in Feasly
Follow the accepted inputs through the Calculation Engine.

Contact Feasly to discuss add-in access and installation for your team.

Edit in Excel. Review the changes. Recalculate in Feasly.September 2026 demonstration · Add-in in testingOpen recording

Edit assumptions in Excel
Review a supported model import
Keep document revisions together

Existing models

Bring in a supported model.

Preserve the value of existing work by inspecting how it carries into Feasly. Review the imported structure, assumptions and calculated results before creating your project. Reconcile the figures with the source and see which areas are editable. The original imported file remains available to download as the case develops.

Reconcile the financial meaning

Quantities & ratesCheck the basis and units.
Period cash flowMatch when the money moves.
Funding & returnsExplain the remaining differences.

Keep the original case as the reference.

Project documents

Keep the evidence with the project.

Add PDFs, images and text documents. Read or download files, follow their revision history and select the relevant revision for an Analyst conversation. Each selected reference keeps that revision, even when a newer document is uploaded.

Cedar Quarter’s actual illustrative project brief, captured from the Feasly reader — Cedar Quarter · Project brief, revision 1 · Illustrative document

Cedar Quarter’s illustrative project brief open in Feasly, with revision 1 and document controls — Cedar Quarter · Project brief, revision 1 · Illustrative document

Excel and the wider model.

Does using Feasly mean giving up Excel?

No. Use Excel where it serves your work and assess Feasly for the calculation, scenario and review workflow around it. An assumptions workbook exchanges defined editable inputs, and model results can be exported to Excel for review. The desktop add-in is in testing. Confirm the current workflow and supported fields with us before planning a rollout.

See what the Calculation Engine does

Can Feasly import an existing development model?

Supported imports let you inspect the structure, assumptions and calculated results before creating a project. Reconcile the result with the source and check which areas are editable. Import support depends on the file and model structure; it is not a promise to translate every workbook, macro or proprietary model. Contact us with the file type and workflow you need to preserve.

Check your model’s compatibility

What should I check before replacing a development feasibility spreadsheet?

Keep a reviewed copy of the existing case. Compare quantities, cost definitions, collection dates, period cash flows, funding and return measures using the same assumptions. Test a delay or cost change as well as the base. Confirm that colleagues can inspect the inputs and obtain the outputs they need. A model migration is useful when it preserves the reasoning and improves how you work with the next decision.

Use the development model audit checklist

How does Feasly compare with EstateMaster, ARGUS Developer and Aprao?

Compare the supported financial methods, the work needed to change and review a case, and the connections your team needs. Our comparisons link to vendor product information and Feasly examples, including a worked appraisal and the ChatGPT integration. Use a representative project to establish whether Feasly improves the assignment you need to complete.

Compare development software