diff --git a/package.json b/package.json
index 1261536b..29848e84 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
   "author": "Open Systems Lab",
   "license": "MPL2",
   "devDependencies": {
+    "@types/geojson": "^7946.0.12",
     "@types/node": "18.16.1",
     "gts": "^5.0.0",
     "husky": "^8.0.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b9777a73..c7b40fb9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -19,6 +19,9 @@ dependencies:
     version: 10.9.1(@types/node@18.16.1)(typescript@5.1.6)
 
 devDependencies:
+  '@types/geojson':
+    specifier: ^7946.0.12
+    version: 7946.0.12
   '@types/node':
     specifier: 18.16.1
     version: 18.16.1
@@ -414,6 +417,10 @@ packages:
     resolution: {integrity: sha512-mEo1sAde+UCE6b2hxn332f1g1E8WfYRu6p5SvTKr2ZKC1f7gFJXk4h5PyGP9Dt6gCaG8y8XhwnXWC6Iy2cmBng==}
     dev: true
 
+  /@types/geojson@7946.0.12:
+    resolution: {integrity: sha512-uK2z1ZHJyC0nQRbuovXFt4mzXDwf27vQeUWNhfKGwRcWW429GOhP8HxUHlM6TLH4bzmlv/HlEjpvJh3JfmGsAA==}
+    dev: true
+
   /@types/json-schema@7.0.12:
     resolution: {integrity: sha512-Hr5Jfhc9eYOQNPYO5WLDq/n4jqijdHNlDXjuAQkkt+mWdQR+XJToOHrsD4cPaMXpn6KO7y2+wM8AZEs8VpBLVA==}
 
diff --git a/types/enums/ProjectTypes.ts b/types/enums/ProjectTypes.ts
index e40e79d5..3a939d59 100644
--- a/types/enums/ProjectTypes.ts
+++ b/types/enums/ProjectTypes.ts
@@ -2,6 +2,7 @@
  * Values of `data.proposal.projectType`
  */
 export const ProjectTypes = {
+  alter: 'Alter a building',
   'alter.balcony': 'Add or alter a balcony',
   'alter.bayWindow': 'Add or remove a bay window',
   'alter.bayWindow.add': 'Add a bay window',
@@ -124,7 +125,7 @@ export const ProjectTypes = {
   'alter.swimmingPool.indoor': 'Install an indoor swimming pool',
   'alter.swimmingPool.outdoor': 'Install an outdoor swimming pool',
   'alter.trees': 'Changes to trees or hedges',
-  changeOfUse: 'Convert a building to a different use',
+  changeOfUse: 'Change the use of a building',
   'changeofUse.annexe':
     'Convert part of the property into a  granny flat (residential annexe)',
   'changeOfUse.caravans': 'Use a caravan or mobile home on the property',
@@ -143,6 +144,7 @@ export const ProjectTypes = {
   'demolish.outbuildings': 'Demolish an outbuilding (such as a garage or barn)',
   'demolish.part': 'Demolish part of a building (such as an extension)',
   'demolish.replace': 'Demolish a building and build homes in its place',
+  extend: 'Extend a building or add an outbuilding',
   'extend.basement': 'Add a basement extension',
   'extend.basement.extend': 'Enlarge a basement',
   'extend.basement.lightwell': 'Add a lightwell',
@@ -197,7 +199,7 @@ export const ProjectTypes = {
   'internal.staircases': 'Alter internal staircases',
   'internal.walls': 'Alter internal walls',
   'internal.windows.openings': 'Alter internal window openings',
-  new: 'Another type of building',
+  new: 'Add another type of building',
   'new.agriculture': 'Agricultural buildings',
   'new.agriculture.glassHouse': 'Agricultural buildings - glass house',
   'new.agriculture.mining': 'Agricultural buildings - mining',
@@ -217,6 +219,7 @@ export const ProjectTypes = {
   'new.temporaryStructure':
     'Erect a temporary structure for historic visitor attractions and listed buildings',
   'new.warehouse': 'Storage or distribution premises',
+  unit: 'Change of units',
   'unit.merge': 'Convert two or more properties into one',
   'unit.subdivide': 'Convert a home or part of a home into flats',
 };
diff --git a/types/schema/data/Property.ts b/types/schema/data/Property.ts
index 8460631f..483183fb 100644
--- a/types/schema/data/Property.ts
+++ b/types/schema/data/Property.ts
@@ -1,6 +1,7 @@
+import {GeoJSON} from 'geojson';
 import {PlanningConstraints} from '../../enums/PlanningConstraints';
 import {PropertyTypes} from '../../enums/PropertyTypes';
-import {Area, GeoJSON, URL} from '../../utils';
+import {Area, URL} from '../../utils';
 
 /**
  * @id #Property
diff --git a/types/schema/data/Proposal.ts b/types/schema/data/Proposal.ts
index b1e6ae82..38a42031 100644
--- a/types/schema/data/Proposal.ts
+++ b/types/schema/data/Proposal.ts
@@ -1,6 +1,7 @@
+import {GeoJSON} from 'geojson';
 import {ProjectTypes} from '../../enums/ProjectTypes';
 import {VehicleParking} from '../../enums/VehicleParking';
-import {Area, Date, GeoJSON} from '../../utils';
+import {Area, Date} from '../../utils';
 
 /**
  * @id #Proposal
diff --git a/types/utils.ts b/types/utils.ts
index 1f03cd96..07574b8a 100644
--- a/types/utils.ts
+++ b/types/utils.ts
@@ -26,11 +26,6 @@ export type DateTime = string;
  */
 export type Date = string;
 
-/**
- * @id #GeoJSON
- */
-export type GeoJSON = Record<string, any>;
-
 /**
  * @id #Area
  */