diff --git a/subsys/net/lib/lwm2m/Kconfig b/subsys/net/lib/lwm2m/Kconfig
index 39e7243b669..d83add97666 100644
--- a/subsys/net/lib/lwm2m/Kconfig
+++ b/subsys/net/lib/lwm2m/Kconfig
@@ -107,6 +107,23 @@ config LWM2M_SECURITY_KEY_SIZE
 	  This setting establishes the size of the key (pre-shared / public)
 	  resources in the security object instances.
 
+config LWM2M_SERVER_DEFAULT_PMIN
+	int "Default server record PMIN"
+	default 10
+	help
+	  Default minimum amount of time in seconds the client must wait
+	  between notifications.  If a resource has to be notified during this
+	  minimum time period, the notification must be sent after the time
+	  period expires.
+
+config LWM2M_SERVER_DEFAULT_PMAX
+	int "Default server record PMAX"
+	default 60
+	help
+	  Default maximum amount of time in seconds the client may wait
+	  between notifications.  When this time period expires a notification
+	  must be sent.
+
 config LWM2M_SERVER_INSTANCE_COUNT
 	int "Maximum # of LWM2M Server object instances"
 	default 1
diff --git a/subsys/net/lib/lwm2m/lwm2m_engine.c b/subsys/net/lib/lwm2m/lwm2m_engine.c
index 66ac22057e5..d5db3d84232 100644
--- a/subsys/net/lib/lwm2m/lwm2m_engine.c
+++ b/subsys/net/lib/lwm2m/lwm2m_engine.c
@@ -83,10 +83,6 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME);
 #define	COAP_OPTION_BUF_LEN	13
 #endif
 
-/* TODO: grab this from server obj */
-#define DEFAULT_SERVER_PMIN	10
-#define DEFAULT_SERVER_PMAX	60
-
 #define MAX_TOKEN_LEN		8
 
 struct observe_node {
@@ -414,8 +410,6 @@ static int engine_add_observer(struct lwm2m_message *msg,
 	struct observe_node *obs;
 	struct notification_attrs attrs = {
 		.flags = BIT(LWM2M_ATTR_PMIN) | BIT(LWM2M_ATTR_PMAX),
-		.pmin  = DEFAULT_SERVER_PMIN,
-		.pmax  = DEFAULT_SERVER_PMAX,
 	};
 	int i, ret;
 
@@ -430,9 +424,11 @@ static int engine_add_observer(struct lwm2m_message *msg,
 		return -EINVAL;
 	}
 
-	/* TODO: get server object for default pmin/pmax
-	 * and observe dup checking
-	 */
+	/* defaults from server object */
+	attrs.pmin = lwm2m_server_get_pmin(msg->ctx->sec_obj_inst);
+	attrs.pmax = lwm2m_server_get_pmax(msg->ctx->sec_obj_inst);
+
+	/* TODO: observe dup checking */
 
 	/* make sure this observer doesn't exist already */
 	SYS_SLIST_FOR_EACH_CONTAINER(&engine_observer_list, obs, node) {
@@ -2535,9 +2531,9 @@ static int lwm2m_write_attr_handler(struct lwm2m_engine_obj *obj,
 			continue;
 		}
 
-		/* TODO: grab default from server obj */
-		nattrs.pmin = DEFAULT_SERVER_PMIN;
-		nattrs.pmax = DEFAULT_SERVER_PMAX;
+		/* defaults from server object */
+		nattrs.pmin = lwm2m_server_get_pmin(msg->ctx->sec_obj_inst);
+		nattrs.pmax = lwm2m_server_get_pmax(msg->ctx->sec_obj_inst);
 
 		ret = update_attrs(obj, &nattrs);
 		if (ret < 0) {
diff --git a/subsys/net/lib/lwm2m/lwm2m_engine.h b/subsys/net/lib/lwm2m/lwm2m_engine.h
index 5fa3ff4d834..d3ff39d3f77 100644
--- a/subsys/net/lib/lwm2m/lwm2m_engine.h
+++ b/subsys/net/lib/lwm2m/lwm2m_engine.h
@@ -102,6 +102,9 @@ size_t lwm2m_engine_get_opaque_more(struct lwm2m_input_context *in,
 int lwm2m_security_inst_id_to_index(u16_t obj_inst_id);
 int lwm2m_security_index_to_inst_id(int index);
 
+s32_t lwm2m_server_get_pmin(u16_t obj_inst_id);
+s32_t lwm2m_server_get_pmax(u16_t obj_inst_id);
+
 #if defined(CONFIG_LWM2M_FIRMWARE_UPDATE_OBJ_SUPPORT)
 u8_t lwm2m_firmware_get_update_state(void);
 void lwm2m_firmware_set_update_state(u8_t state);
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_server.c b/subsys/net/lib/lwm2m/lwm2m_obj_server.c
index 4378ce859a6..12712dcb99c 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_server.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_server.c
@@ -98,6 +98,32 @@ static int update_trigger_cb(u16_t obj_inst_id)
 #endif
 }
 
+static s32_t server_get_instance_s32(u16_t obj_inst_id, s32_t *data,
+				     s32_t default_value)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(inst); i++) {
+		if (inst[i].obj && inst[i].obj_inst_id == obj_inst_id) {
+			return data[i];
+		}
+	}
+
+	return default_value;
+}
+
+s32_t lwm2m_server_get_pmin(u16_t obj_inst_id)
+{
+	return server_get_instance_s32(obj_inst_id, default_min_period,
+				       CONFIG_LWM2M_SERVER_DEFAULT_PMIN);
+}
+
+s32_t lwm2m_server_get_pmax(u16_t obj_inst_id)
+{
+	return server_get_instance_s32(obj_inst_id, default_max_period,
+				       CONFIG_LWM2M_SERVER_DEFAULT_PMAX);
+}
+
 static struct lwm2m_engine_obj_inst *server_create(u16_t obj_inst_id)
 {
 	int index, i = 0;
@@ -128,8 +154,8 @@ static struct lwm2m_engine_obj_inst *server_create(u16_t obj_inst_id)
 	server_flag_store_notify[index] = 0U;
 	server_id[index] = index + 1;
 	lifetime[index] = CONFIG_LWM2M_ENGINE_DEFAULT_LIFETIME;
-	default_min_period[index] = 0U;
-	default_max_period[index] = 0U;
+	default_min_period[index] = CONFIG_LWM2M_SERVER_DEFAULT_PMIN;
+	default_max_period[index] = CONFIG_LWM2M_SERVER_DEFAULT_PMAX;
 	disabled_timeout[index] = 86400U;
 	strcpy(transport_binding[index], "U");