---
title: "Kalceo"
description: "Compliance platform and operational tools for French construction tradespeople. Practice sheets, free calculators, trade hubs, and legal blog."
created: 2026-05-04T14:00:00+02:00
updated: 2026-06-02T20:15:00+02:00
tags: ["Construction", "Artisans", "Compliance", "Cloudflare", "Tailwind CSS"]
url: "https://kalceo.fr"
icon: "/images/icons/icon-abacus.svg"
image: "/images/projects/kalceo-card.webp"
---

## Context

Construction tradespeople in France operate in a dense regulatory environment: e-invoicing, multi-rate VAT, legal warranties, subcontracting rules, self-employed contributions — each area has its own rules, thresholds, and deadlines. Most available resources are either too generic or buried in unreadable official texts.

Kalceo started from a simple need: give construction tradespeople direct access to the information they need, at the right moment, without unnecessary jargon. What began as a 2026 e-invoicing-compliant quote tool has evolved into a compliance and operational platform for construction artisans and small businesses.

## What Kalceo does

### Practice sheets

A library of 39 short practice sheets (~2 min read) covering the key topics of running a trade business: invoicing, regulations, HR management, legal warranties, subcontracting, unpaid invoices. Each sheet addresses one specific point with figures updated for 2026.

### Free calculators

Four online calculation tools available without sign-up:

- **Artisan retirement 2026** — pension estimate based on the SSI scheme
- **Late payment penalties** — amount owed + flat €40 indemnity
- **Construction VAT** — applicable rate (5.5%, 10%, or 20%) based on the type of work
- **Tiling calculator** — tile quantities, adhesive, and grout for a given surface

New calculators published each month.

### Long-form blog

In-depth analyses on the legal and management topics that matter to tradespeople: two-year warranty, right of withdrawal, dispute resolution, hourly pricing, e-invoicing platforms, MaPrimeRénov'. Content distinct from the practice sheets, aimed at understanding rather than quick reference.

### Trade hubs

Thematic verticals grouping all relevant resources by trade — practice sheets, calculators, quote templates. The Tiler hub is live. More trades are being added progressively.

## Tech stack

Kalceo runs on a deliberately simple architecture:

- **Static HTML** — no server-side framework, instant rendering, zero runtime dependencies
- **Tailwind CSS** — utility-first layout, minimal build output
- **Cloudflare Pages** — global edge hosting, native HTTPS, continuous deployment from Git
- **Cloudflare Functions** — server-side forms (newsletter, lead magnets, transactional email) without dedicated infrastructure

The static-first approach is foundational: documentary content, fast deployment, near-zero marginal cost. Cloudflare Functions handle the handful of interactions needed without sacrificing that simplicity.

## In production

Kalceo is live at [kalceo.fr](https://kalceo.fr). Content evolves at the pace of regulatory updates and new tool releases.