ˈeɪtʃ. dˈuːvəsˌɛlɪˌaɪ mˈeɪ ɐtˈeɪn ɐ tˈoʊɾəl lˈɛŋθ ɪŋklˈuːdɪŋ tˈeɪl ʌv ˈʌp tuː , wɪð ɐ snˈaʊttəvˈɛnt lˈɛŋθ ˌɛsvˌiːˈɛl ˈʌp tuː , wˈeɪɪŋ ˌʌp tə wˈʌnhˈʌndɹɪd twˈɛnti ɡɹˈæmz fˈoːɹ.tˈuː ˈaʊnsᵻz, mˌeɪkɪŋ ɪt ðə lˈɑːɹdʒɪst lˈɪvɪŋ ɡˈɛkoʊ ɪn nˈuː zˈiːlənd.
H. duvaucelii may attain a total length (including tail) of up to , with a snout-to-vent length (SVL) up to , weighing up to 120 grams (4.2 ounces), making it the largest living gecko in New Zealand.