Low density in Tulum, in real numbers: a maximum lot coverage (COS) of 35% means a 1,000 m² lot keeps at least 650 m² unbuilt and green — permanently, by regulation. At Selvadentro, 65% of the entire project's jungle stays untouched. That is what "low density" means when it is written down, not just said.
"Low density" may be the most abused phrase in Riviera Maya real estate. Nearly every brochure claims it; few define it. So this post does the unfashionable thing and shows the arithmetic — what the rules say, why rules matter more than promises, what the jungle does for the water under your feet, and what all of it does to value. We are a developer, so read us as an interested party. The numbers, however, are checkable.
What does COS 35% actually mean?
Two acronyms govern how much anyone can build on a lot. COS (coeficiente de ocupación del suelo) caps the footprint — the share of the lot the building touches. CUS (coeficiente de utilización del suelo) caps total constructed area across all floors. At Selvadentro the rules are COS 35%, CUS 70%, and a maximum of two levels plus a roof deck.
Here is what that produces on real lot sizes — Selvadentro lots run from 400 m² to 1,673 m²:
| Lot size | Max footprint (COS 35%) | Stays green (≥65%) | Max total built area (CUS 70%) |
|---|---|---|---|
| 400 m² | 140 m² | 260 m² | 280 m² |
| 1,000 m² | 350 m² | 650 m² | 700 m² |
| 1,673 m² | ~586 m² | ~1,087 m² | ~1,171 m² |
Read the middle column twice. On a 1,000 m² lot, at least 650 m² of jungle is not landscaping around a building — it is the majority of the property. A 280 m² two-level home on a 400 m² lot is a generous house. The regulation does not prevent comfort; it prevents the slow creep by which a jungle community becomes a paved one.
Why does regulation beat promises?
Because promises expire and neighbors change. A developer's rendering binds no one. A "green vision" survives exactly as long as the next owner shares it.
A building regulation is different in kind: COS 35%, CUS 70% and the two-level height cap bind every owner, forever — including the neighbor who buys in 2031 with very different taste. Nobody can assemble three lots and put up a boutique hotel next to your bedroom. Height caps also mean nobody builds above the canopy, so the view from every roof deck stays jungle, not rooftops.
This is the honest test we suggest applying to any development in the region, ours included: ask for the density rules in writing, inside the regime documents that bind buyers — not in the sales deck. If the answer is a mood board, the density is a mood. It is the same logic we apply to legal status, and it is why a gated community in Tulum with hard rules is a different asset from one with good intentions.
What does the jungle do for the aquifer?
Tulum sits on porous limestone with no surface rivers; rain filters straight down into the aquifer — the peninsula holds the largest underground river network on the planet, and it feeds every cenote in the region.
Jungle and pavement treat that rain very differently. Vegetated ground absorbs rainfall and filters it through roots, soil and rock on its way down. Impermeable surface — roofs, concrete, asphalt — does the opposite: water runs off, picking up whatever sits on the surface, and enters the ground concentrated instead of filtered.
So a coverage cap is not an aesthetic gesture. Capping every lot at 35% built surface, keeping 65% of the whole project as standing jungle, and running an underground water network is, qualitatively, aquifer protection: more absorption, less runoff, cleaner recharge. With nine cenotes inside the project — mapped and preserved with specialists, as we describe on our cenotes page — this is not abstract for us. The water is on the property.
Does preserved jungle actually protect value?
Scarcity is doing the work here, and it is worth being precise about which scarcity. Buildable land near Tulum is not scarce. Buildable land surrounded by protected jungle that can never densify is — because most of what borders Selvadentro on the Ruta de los Cenotes side is nature reserves and attractions, not future competing towers.
Our own price series is one data point, offered with the obvious caveat that it is ours: $119 USD/m² at launch in May 2025, $167 USD/m² today — +40% in 12 months — with the developer projecting $280–360 USD/m² at project close. Access infrastructure compounds it: the Maya Train and the Tulum airport both opened in December 2023, and the Playa–Cobá bypass is under construction nearby. For the broader market context, see our Tulum appreciation data.
The mechanism is intuitive. Anywhere in the world, the properties that hold value hardest are the ones whose surroundings are guaranteed: the house on the park, the lot on the protected coastline. A regulation that freezes 65% of the land as jungle is that guarantee, written down.
How does a masterplan enforce low density?
Density is decided at the masterplan stage, before the first lot is drawn. Selvadentro's masterplan, by Estudio AMA, inverted the usual order: specialists mapped the nine cenotes and the mature jungle first, and roads, lots and amenities were placed where that map allowed. The result — a plan where the jungle dictated the layout — has been covered by the international architecture press, including ArchEyes, Archello, ADF Web Magazine and Amazing Architecture.
That inversion is what makes the 65% credible. Preservation that is drawn into the plan from day one does not have to be defended lot by lot later; it is simply where the roads do not go. It is the approach we would want to see from any eco-conscious development in Tulum.
The short version
Low density is a number, or it is nothing. Ask for the COS, the CUS, the height cap and the preserved percentage — in writing. If you want to see what those numbers look like as actual land, our available lots in Tulum list them openly, and we are glad to walk you through the regime documents before you commit to anything.