diff --git a/migrations/20190604_project_estimation_add_quantity.sql b/migrations/20190604_project_estimation_add_quantity.sql
new file mode 100644
index 00000000..39f58b15
--- /dev/null
+++ b/migrations/20190604_project_estimation_add_quantity.sql
@@ -0,0 +1,10 @@
+--
+-- UPDATE EXISTING TABLES:
+--   project_estimations:
+--     added column `quantity`
+
+--
+-- product_templates
+
+-- Add new column
+ALTER TABLE project_estimations ADD COLUMN "quantity" int DEFAULT 1;
\ No newline at end of file
diff --git a/src/models/projectEstimation.js b/src/models/projectEstimation.js
index 241db456..5bc2a7ec 100644
--- a/src/models/projectEstimation.js
+++ b/src/models/projectEstimation.js
@@ -6,6 +6,7 @@ module.exports = function defineProjectHistory(sequelize, DataTypes) {
       buildingBlockKey: { type: DataTypes.STRING, allowNull: false },
       conditions: { type: DataTypes.STRING, allowNull: false },
       price: { type: DataTypes.DOUBLE, allowNull: false },
+      quantity: { type: DataTypes.INTEGER, allowNull: true },
       minTime: { type: DataTypes.INTEGER, allowNull: false },
       maxTime: { type: DataTypes.INTEGER, allowNull: false },
       metadata: { type: DataTypes.JSON, allowNull: false, defaultValue: {} },
diff --git a/src/routes/projects/create.js b/src/routes/projects/create.js
index ecab51b4..fe93fd91 100644
--- a/src/routes/projects/create.js
+++ b/src/routes/projects/create.js
@@ -60,6 +60,7 @@ const createProjectValdiations = {
       estimation: Joi.array().items(Joi.object().keys({
         conditions: Joi.string().required(),
         price: Joi.number().required(),
+        quantity: Joi.number().optional(),
         minTime: Joi.number().integer().required(),
         maxTime: Joi.number().integer().required(),
         buildingBlockKey: Joi.string().required(),