diff --git a/code/game/objects/items/rcd/RCD.dm b/code/game/objects/items/rcd/RCD.dm
index 297c8a1eabd..ab97026a6a1 100644
--- a/code/game/objects/items/rcd/RCD.dm
+++ b/code/game/objects/items/rcd/RCD.dm
@@ -138,14 +138,14 @@
 			var/list/structures_to_ignore
 			if(istype(target, /obj/structure/grille))
 				if(is_full_tile) //if we are trying to build full-tile windows we ignore the grille
-					structures_to_ignore = list(target)
-				else //no building directional windows on grills
-					return FALSE
+					structures_to_ignore = list(/obj/structure/grille)
+				else //when building directional windows we ignore the grill and other directional windows
+					structures_to_ignore = list(/obj/structure/grille, /obj/structure/window)
 			else //for directional windows we ignore other directional windows as they can be in diffrent directions on the turf.
 				structures_to_ignore = list(/obj/structure/window)
 
 			//check if we can build our window on the grill
-			if(target_turf.is_blocked_turf(exclude_mobs = !is_full_tile, source_atom = null, ignore_atoms = structures_to_ignore, type_list = !is_full_tile))
+			if(target_turf.is_blocked_turf(exclude_mobs = !is_full_tile, source_atom = null, ignore_atoms = structures_to_ignore, type_list = TRUE))
 				playsound(loc, 'sound/machines/click.ogg', 50, TRUE)
 				balloon_alert(user, "something is blocking the turf")
 				return FALSE
diff --git a/code/game/objects/structures/grille.dm b/code/game/objects/structures/grille.dm
index bb82c6fb294..73f3972ef83 100644
--- a/code/game/objects/structures/grille.dm
+++ b/code/game/objects/structures/grille.dm
@@ -68,7 +68,13 @@
 			var/cost = 0
 			var/delay = 0
 
-			if(the_rcd.rcd_design_path  == /obj/structure/window/fulltile)
+			if(the_rcd.rcd_design_path  == /obj/structure/window)
+				cost = 4
+				delay = 2 SECONDS
+			else if(the_rcd.rcd_design_path  == /obj/structure/window/reinforced)
+				cost = 6
+				delay = 2.5 SECONDS
+			else if(the_rcd.rcd_design_path  == /obj/structure/window/fulltile)
 				cost = 8
 				delay = 3 SECONDS
 			else if(the_rcd.rcd_design_path  == /obj/structure/window/reinforced/fulltile)
@@ -101,8 +107,13 @@
 			var/obj/structure/window/window_path = rcd_data["[RCD_DESIGN_PATH]"]
 			if(!ispath(window_path))
 				CRASH("Invalid window path type in RCD: [window_path]")
-			if(!initial(window_path.fulltile)) //only fulltile windows can be built here
-				return FALSE
+
+			//checks if its a valid build direction
+			if(!initial(window_path.fulltile))
+				if(!valid_build_direction(loc, user.dir, is_fulltile = FALSE))
+					balloon_alert(user, "window already here!")
+					return FALSE
+
 			var/obj/structure/window/WD = new window_path(T, user.dir)
 			WD.set_anchored(TRUE)
 			return TRUE