diff --git a/rules/architecture/batiment.cpp b/rules/architecture/batiment.cpp
index 33cfecb..94677c4 100644
--- a/rules/architecture/batiment.cpp
+++ b/rules/architecture/batiment.cpp
@@ -5,11 +5,37 @@ BatimentQuad_::BatimentQuad_(Quad _c) : Chose(), c(_c) {
 }
 
 bool BatimentQuad_::split() {
-	Quad ch = c.offsetNormal(Dimensions::hauteurEtage);
-	addChild(new ToitQuad(ch, Dimensions::hauteurToit));
+    Quad q;
+
+    if(!isSub)
+        q = c >> ((c.maxLengthNS() < c.maxLengthEW()) ? 1 : 0);
+    else
+        q = c;
+
+    int minSurface = 1000000;
+
+    if(q.surface() > 2* minSurface) {
+        Vertex c1 = q[NW] + Vertex(q[NE] - q[NW])/2;
+        Vertex c2 = q[SW] + Vertex(q[SE] - q[SW])/2;
+        Quad q1 = Quad(c1,c2,q[SW],q[NW]).inset(E,30);
+        Quad q2 = Quad(q[NE],q[SE],c2,c1).inset(W,30);
+
+        addChild((new BatimentQuad_(q1))->isSubdivision(true));
+        addChild((new BatimentQuad_(q2))->isSubdivision(true));
+    }
+    else {
+        Quad ch = c.offsetNormal(Dimensions::hauteurEtage);
+        addChild(new ToitQuad(ch, Dimensions::hauteurToit));
+    }
+
 	return true;
 }
 
+BatimentQuad_* BatimentQuad_::isSubdivision(bool val) {
+    this->isSub  = val;
+    return this;
+}
+
 void BatimentQuad_::triangulation() {
 	Quad ch = c.offsetNormal(Dimensions::hauteurEtage + Dimensions::hauteurToit);
 	addGPUQuad(ch, Couleurs::toit);
diff --git a/rules/architecture/batiment.hh b/rules/architecture/batiment.hh
index 79499bc..a801c95 100644
--- a/rules/architecture/batiment.hh
+++ b/rules/architecture/batiment.hh
@@ -5,16 +5,20 @@
 
 class BatimentQuad_ : public Chose {
 	Quad c;
-public:
+    bool isSub;
+
+    public:
 	BatimentQuad_(Quad _c);
 	virtual bool split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
+	BatimentQuad_* isSubdivision(bool val);
 };
 
 class BatimentTri_ : public Chose {
 	Triangle c;
-public:
+
+    public:
 	BatimentTri_(Triangle _c);
 	virtual bool split();
 	virtual void triangulation();