Does it look anything like this? (imagine it's concrete!)

http://www.sighet.ro/p_cultural.htm ("Copertina de la intrare" - you can enlarge the picture)

My first thought was "awning", but awnings are usually made of some kind of fabric/canvas, and the one you're talking about is concrete. Canopies can come in all shapes and sizes (and materials, including concrete apparently); here's a "main entrance canopy":

http://www.unionhospital.org/news_detail.asp?id=12

Here's another one:

"The main entrance canopy was designed with a low-rise arch and converging hanger rods to distinguish it from the other entryways."
http://www.moderntrade.com/edit3/1204mab.htm (the arched one that says "THE METRO" over it)

"Door canopies" on the front of a house are usually smaller:

http://www.canopiessouthwest.co.uk/door_canopies.html

They can also be supported by posts - e.g.

http://www.clovis-canopies.com/uxbridge.htm

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Note added at 6 hrs (2006-07-04 14:21:32 GMT)
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După o altă căutare, am găsit că aici "glass canopies" le-au zis "copertine din sticlă":

http://www.glassexpert.ro/copertine.php?idcat=16_89

Îmi imaginez că le-au zis "canopies" în loc de "awnings" din cauză faptului că sunt din sticlă, ci nu din material.

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Note added at 6 hrs (2006-07-04 14:27:18 GMT)
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S-ar putea să vă va trebui să faceţi click pe "ENGLISH" şi să navigaţi puţin pe acest site ca să vedeţi versiunea engleză. Iniţial am văzut cele două limbi pe aceeaşi păgină, dar când bifez linkul respectiv acum, ajung numai la traducerea în română.

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Note added at 1 day14 hrs (2006-07-05 22:31:59 GMT)
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And, finally, it also features in this rather useful-looking EN-RO architecture glossary:

canopy, n.
copertina; baldachin

http://www.iaim.ro/catedre/istorie_teorie_restaurare/note/en...