diff --git a/getssl b/getssl
index 1998d82..dac2d2d 100755
--- a/getssl
+++ b/getssl
@@ -2972,14 +2972,26 @@ if [[ "${CHECK_REMOTE}" == "true" ]] && [[ $_FORCE_RENEW -eq 0 ]]; then
 fi
 # end of .... check_remote is true then connect and obtain the current certificate
 
+#create SAN
+if [[ -z "$SANS" ]]; then
+  SANLIST="subjectAltName=DNS:${DOMAIN}"
+elif [[ "$IGNORE_DIRECTORY_DOMAIN" == "true" ]]; then
+  SANLIST="subjectAltName=DNS:${SANS//[, ]/,DNS:}"
+else
+  SANLIST="subjectAltName=DNS:${DOMAIN},DNS:${SANS//[, ]/,DNS:}"
+fi
+debug "created SAN list = $SANLIST"
+
 # if there is an existing certificate file, check details.
 if [[ -s "$CERT_FILE" ]]; then
   debug "certificate $CERT_FILE exists"
   enddate=$(openssl x509 -in "$CERT_FILE" -noout -enddate 2>/dev/null| cut -d= -f 2-)
   debug "local cert is valid until $enddate"
+  existing_sanlist=$(openssl x509 -in "$CERT_FILE" -noout -text | grep "DNS:" | sed 's/^ *//g')
+  debug "local cert is for domains: ${existing_sanlist}"
   if [[ "$enddate" != "-" ]]; then
     enddate_s=$(date_epoc "$enddate")
-    if [[ $(date_renew) -lt "$enddate_s" ]] && [[ $_FORCE_RENEW -ne 1 ]]; then
+    if [[ $(date_renew) -lt "$enddate_s" ]] && [[ $_FORCE_RENEW -ne 1 ]] && [[ "subjectAltName=$existing_sanlist" == "$SANLIST" ]]; then
       issuer=$(openssl x509 -in "$CERT_FILE" -noout -issuer 2>/dev/null)
       if [[ "$issuer" == *"Fake LE Intermediate"* ]] && [[ "$CA" == "https://acme-v02.api.letsencrypt.org" ]]; then
         debug "upgrading from fake cert to real"
@@ -2989,6 +3001,9 @@ if [[ -s "$CERT_FILE" ]]; then
         graceful_exit $_NOTIFY_VALID
       fi
     else
+      if [[ "subjectAltName=$existing_sanlist" != "$SANLIST" ]]; then
+        info "Domain list in existing certificate ($existing_sanlist) does not match domains requested ($SANLIST), so recreating certificate"
+      fi
       debug "${DOMAIN}: certificate needs renewal"
     fi
   fi
@@ -3027,16 +3042,6 @@ else
 fi
 # End of creating domain keys.
 
-#create SAN
-if [[ -z "$SANS" ]]; then
-  SANLIST="subjectAltName=DNS:${DOMAIN}"
-elif [[ "$IGNORE_DIRECTORY_DOMAIN" == "true" ]]; then
-  SANLIST="subjectAltName=DNS:${SANS//[, ]/,DNS:}"
-else
-  SANLIST="subjectAltName=DNS:${DOMAIN},DNS:${SANS//[, ]/,DNS:}"
-fi
-debug "created SAN list = $SANLIST"
-
 #create CSR's
 if [[ "$DUAL_RSA_ECDSA" == "false" ]]; then
   create_csr "$DOMAIN_DIR/${DOMAIN}.csr" "$DOMAIN_DIR/${DOMAIN}.key"
diff --git a/test/19-test-add-to-sans.bats b/test/19-test-add-to-sans.bats
index da9deb7..f00bb4e 100644
--- a/test/19-test-add-to-sans.bats
+++ b/test/19-test-add-to-sans.bats
@@ -10,31 +10,24 @@ setup() {
     if [ -z "$STAGING" ]; then
         export CURL_CA_BUNDLE=/root/pebble-ca-bundle.crt
         curl --silent -X POST -d '{"host":"a.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/add-a
-        curl --silent -X POST -d '{"host":"b.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/add-a
     fi
 }
 
 teardown() {
     if [ -z "$STAGING" ]; then
         curl --silent -X POST -d '{"host":"a.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/clear-a
-        curl --silent -X POST -d '{"host":"b.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/clear-a
     fi
 }
 
 
 @test "Create certificate to check can add to SANS" {
-    skip "FIXME: Certificate is not recreated when SANS is updated"
     if [ -n "$STAGING" ]; then
         skip "Not trying on staging server yet"
-        CONFIG_FILE="getssl-dns01.cfg"
-    else
-        CONFIG_FILE="getssl-dns01-add-to-sans-1.cfg"
     fi
-    . "${CODE_DIR}/test/test-config/${CONFIG_FILE}"
+    CONFIG_FILE="getssl-dns01.cfg"
     setup_environment
-
-
     init_getssl
+
     create_certificate
     assert_success
     check_output_for_errors
@@ -42,23 +35,34 @@ teardown() {
 
 
 @test "Check we can add a new domain to SANS" {
-    skip "FIXME: Certificate is not recreated when SANS is updated"
     if [ -n "$STAGING" ]; then
         skip "Not trying on staging server yet"
-        CONFIG_FILE="getssl-dns01.cfg"
-    else
-        CONFIG_FILE="getssl-dns01-add-to-sans-2.cfg"
     fi
-    # . "${CODE_DIR}/test/test-config/${CONFIG_FILE}"
-    # CERT=${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/${GETSSL_CMD_HOST}.crt
-    # KEY=${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/${GETSSL_CMD_HOST}.key
-    # cp "${CODE_DIR}/test/test-config/${CONFIG_FILE}" "${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/getssl.cfg"
+    CONFIG_FILE="getssl-dns01.cfg"
+
+    cat <<- EOF > ${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/getssl_test_specific.cfg
+SANS="a.${GETSSL_HOST}"
+EOF
+
+    . "${CODE_DIR}/test/test-config/${CONFIG_FILE}"
+    CERT=${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/${GETSSL_CMD_HOST}.crt
 
     create_certificate
     assert_success
     check_output_for_errors
 
     # As the SANS list changed, a new certificate is needed
+    assert_line --partial "does not match domains requested"
+    assert_line --partial "does not have the same domains as the config - re-create-csr"
     assert_line --partial "certificate installed OK on server"
     refute_line --partial 'certificate is valid for more than'
+
+    # Check that the SAN list in the certificate matches the expected value
+    SAN_IN_CERT=$(openssl x509 -in "$CERT" -noout -text | grep "DNS:" | sed 's/^ *//g')
+    SAN_EXPECTED="DNS:${GETSSL_HOST}, DNS:a.${GETSSL_HOST}"
+    if [[ "$SAN_IN_CERT" != "$SAN_EXPECTED" ]]; then
+        echo "# SAN_IN_CERT=$SAN_IN_CERT"
+        echo "# SAN_EXPECTED=$SAN_EXPECTED"
+    fi
+    [ "${SAN_IN_CERT}" = "$SAN_EXPECTED" ]
 }
diff --git a/test/7-test-renewal.bats b/test/7-test-renewal.bats
new file mode 100644
index 0000000..074f882
--- /dev/null
+++ b/test/7-test-renewal.bats
@@ -0,0 +1,96 @@
+#! /usr/bin/env bats
+
+load '/bats-support/load.bash'
+load '/bats-assert/load.bash'
+load '/getssl/test/test_helper.bash'
+
+
+# This is run for every test
+setup() {
+    if [ -z "$STAGING" ]; then
+        export CURL_CA_BUNDLE=/root/pebble-ca-bundle.crt
+        curl --silent -X POST -d '{"host":"a.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/add-a
+        curl --silent -X POST -d '{"host":"b.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/add-a
+    fi
+}
+
+teardown() {
+    if [ -z "$STAGING" ]; then
+        curl --silent -X POST -d '{"host":"a.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/clear-a
+        curl --silent -X POST -d '{"host":"b.'$GETSSL_HOST'", "addresses":["'$GETSSL_IP'"]}' http://10.30.50.3:8055/clear-a
+    fi
+}
+
+
+@test "Create certificate to check renewal" {
+    if [ -n "$STAGING" ]; then
+        skip "Not testing renewal on staging server"
+    fi
+    CONFIG_FILE="getssl-dns01.cfg"
+    setup_environment
+    init_getssl
+
+    create_certificate
+    assert_success
+    check_output_for_errors
+}
+
+
+@test "Check that trying to renew a certificate which doesn't need renewing doesn't do anything" {
+    if [ -n "$STAGING" ]; then
+        skip "Not trying on staging server yet"
+    fi
+
+    CONFIG_FILE="getssl-dns01.cfg"
+    . "${CODE_DIR}/test/test-config/${CONFIG_FILE}"
+    CERT=${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/${GETSSL_CMD_HOST}.crt
+    ORIGINAL_ENDDATE=$(openssl x509 -in "$CERT" -noout -enddate 2>/dev/null| cut -d= -f 2-)
+
+    create_certificate
+    assert_success
+    check_output_for_errors
+
+    # Check that getssl didn't renew the certificate
+    refute_line --partial "certificate needs renewal"
+    assert_line --partial 'certificate is valid for more than'
+
+    # Check that the end date in the certificate hasn't changed
+    UPDATED_ENDDATE=$(openssl x509 -in "$CERT" -noout -enddate 2>/dev/null| cut -d= -f 2-)
+    if [[ "$ORIGINAL_ENDDATE" != "$UPDATED_ENDDATE" ]]; then
+        echo "# ORIGINAL_ENDDATE=$ORIGINAL_ENDDATE"
+        echo "# UPDATED_ENDDATE =$UPDATED_ENDDATE"
+    fi
+    [[ "$ORIGINAL_ENDDATE" = "$UPDATED_ENDDATE" ]]
+}
+
+
+
+@test "Check that we can renew a certificate which does need renewing" {
+    if [ -n "$STAGING" ]; then
+        skip "Not trying on staging server yet"
+    fi
+
+    CONFIG_FILE="getssl-dns01.cfg"
+    cat <<- EOF > ${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/getssl_test_specific.cfg
+RENEW_ALLOW=2000
+EOF
+
+    . "${CODE_DIR}/test/test-config/${CONFIG_FILE}"
+    CERT=${INSTALL_DIR}/.getssl/${GETSSL_CMD_HOST}/${GETSSL_CMD_HOST}.crt
+    ORIGINAL_ENDDATE=$(openssl x509 -in "$CERT" -noout -enddate 2>/dev/null| cut -d= -f 2-)
+
+    create_certificate
+    assert_success
+    check_output_for_errors
+
+    # Check that getssl didn't renew the certificate
+    refute_line --partial 'certificate is valid for more than'
+
+    # Check that the end date in the certificate hasn't changed
+    UPDATED_ENDDATE=$(openssl x509 -in "$CERT" -noout -enddate 2>/dev/null| cut -d= -f 2-)
+    if [[ "$ORIGINAL_ENDDATE" = "$UPDATED_ENDDATE" ]]; then
+        echo "# ORIGINAL_ENDDATE=$ORIGINAL_ENDDATE"
+        echo "# UPDATED_ENDDATE =$UPDATED_ENDDATE"
+    fi
+    [[ "$ORIGINAL_ENDDATE" != "$UPDATED_ENDDATE" ]]
+}
diff --git a/test/test-config/getssl-dns01-add-to-sans-1.cfg b/test/test-config/getssl-dns01-add-to-sans-1.cfg
deleted file mode 100644
index ddb514a..0000000
--- a/test/test-config/getssl-dns01-add-to-sans-1.cfg
+++ /dev/null
@@ -1,37 +0,0 @@
-# Uncomment and modify any variables you need
-# see https://github.com/srvrco/getssl/wiki/Config-variables for details
-# see https://github.com/srvrco/getssl/wiki/Example-config-files for example configs
-#
-CA="https://pebble:14000/dir"
-
-VALIDATE_VIA_DNS=true
-DNS_ADD_COMMAND="/getssl/dns_scripts/dns_add_challtestsrv"
-DNS_DEL_COMMAND="/getssl/dns_scripts/dns_del_challtestsrv"
-AUTH_DNS_SERVER=10.30.50.3
-
-# Speed up the test by reducing the number or retries and the wait between retries.
-DNS_WAIT=2
-DNS_WAIT_COUNT=11
-DNS_EXTRA_WAIT=0
-
-# Additional domains - this could be multiple domains / subdomains in a comma separated list
-SANS="a.${GETSSL_HOST}"
-
-# Location for all your certs, these can either be on the server (full path name)
-# or using ssh /sftp as for the ACL
-DOMAIN_CERT_LOCATION="/etc/nginx/pki/server.crt"
-DOMAIN_KEY_LOCATION="/etc/nginx/pki/private/server.key"
-CA_CERT_LOCATION="/etc/nginx/pki/chain.crt"
-DOMAIN_CHAIN_LOCATION="" # this is the domain cert and CA cert
-DOMAIN_PEM_LOCATION="" # this is the domain_key, domain cert and CA cert
-
-# The command needed to reload apache / nginx or whatever you use
-RELOAD_CMD="cp /getssl/test/test-config/nginx-ubuntu-ssl ${NGINX_CONFIG} && /getssl/test/restart-nginx"
-
-# Define the server type and confirm correct certificate is installed
-SERVER_TYPE="https"
-CHECK_REMOTE="true"
-IGNORE_DIRECTORY_DOMAIN="true"
-
-#_USE_DEBUG=1
-#_RUNNING_TEST=1
diff --git a/test/test-config/getssl-dns01-add-to-sans-2.cfg b/test/test-config/getssl-dns01-add-to-sans-2.cfg
deleted file mode 100644
index 9196905..0000000
--- a/test/test-config/getssl-dns01-add-to-sans-2.cfg
+++ /dev/null
@@ -1,37 +0,0 @@
-# Uncomment and modify any variables you need
-# see https://github.com/srvrco/getssl/wiki/Config-variables for details
-# see https://github.com/srvrco/getssl/wiki/Example-config-files for example configs
-#
-CA="https://pebble:14000/dir"
-
-VALIDATE_VIA_DNS=true
-DNS_ADD_COMMAND="/getssl/dns_scripts/dns_add_challtestsrv"
-DNS_DEL_COMMAND="/getssl/dns_scripts/dns_del_challtestsrv"
-AUTH_DNS_SERVER=10.30.50.3
-
-# Speed up the test by reducing the number or retries and the wait between retries.
-DNS_WAIT=2
-DNS_WAIT_COUNT=11
-DNS_EXTRA_WAIT=0
-
-# Additional domains - this could be multiple domains / subdomains in a comma separated list
-SANS="b.${GETSSL_HOST}, a.${GETSSL_HOST}"
-
-# Location for all your certs, these can either be on the server (full path name)
-# or using ssh /sftp as for the ACL
-DOMAIN_CERT_LOCATION="/etc/nginx/pki/server.crt"
-DOMAIN_KEY_LOCATION="/etc/nginx/pki/private/server.key"
-CA_CERT_LOCATION="/etc/nginx/pki/chain.crt"
-DOMAIN_CHAIN_LOCATION="" # this is the domain cert and CA cert
-DOMAIN_PEM_LOCATION="" # this is the domain_key, domain cert and CA cert
-
-# The command needed to reload apache / nginx or whatever you use
-RELOAD_CMD="cp /getssl/test/test-config/nginx-ubuntu-ssl ${NGINX_CONFIG} && /getssl/test/restart-nginx"
-
-# Define the server type and confirm correct certificate is installed
-SERVER_TYPE="https"
-CHECK_REMOTE="false"
-IGNORE_DIRECTORY_DOMAIN="true"
-
-#_USE_DEBUG=1
-#_RUNNING_TEST=1