Andrew T. Guzman

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Andrew Guzman is Professor of Law, Director of the Advanced Law Degree Programs, and Associate Dean for International and Executive Education at Berkeley Law School, University of California, Berkeley. Professor Guzman holds a J.D. and Ph.D. in economics from Harvard University. He has written extensively on international trade, international regulatory matters, foreign direct investment and public international law. He is the author of Overheated: The Human Cost of Climate Change, How International Law Works both from Oxford University Press and International Trade Law from Wolters Kluwer.
Professor Guzman served as editor for the Research Handbook In International Economic Law, published by Edward Elgar Press and Regulation and Competition
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How Much Over an Estimate Can a Contractor Go Without Your Approval?

Understanding how much over an estimate a contractor can go matters when your renovation bill arrives higher than expected.

There is no nationwide percentage that contractors may exceed an estimate without approval; for example, Pennsylvania permits 10% on qualifying time-and-materials contracts, while California requires written changes for covered home-improvement contracts.

Unforeseen complicat

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Published on July 19, 2026 23:42
Average rating: 4.06 · 137 ratings · 13 reviews · 12 distinct works
Overheated: The Human Cost ...

3.99 avg rating — 77 ratings — published 2013 — 7 editions
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International Trade Law

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3.67 avg rating — 21 ratings — published 2009 — 5 editions
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How International Law Works...

4.18 avg rating — 17 ratings — published 2007 — 7 editions
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International Trade Law: Do...

4.13 avg rating — 8 ratings — published 2012
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International Trade Law (As...

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4.67 avg rating — 6 ratings2 editions
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Research Handbook in Intern...

it was amazing 5.00 avg rating — 3 ratings — published 2007 — 5 editions
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Cooperation, Comity, and Co...

it was amazing 5.00 avg rating — 3 ratings — published 2010 — 3 editions
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International Trade Law: 20...

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it was amazing 5.00 avg rating — 2 ratings — published 2009
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Overheated

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really liked it 4.00 avg rating — 1 rating
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Overheated: The Human Cost ...

0.00 avg rating — 0 ratings2 editions
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Andrew T. Guzman wrote a new blog post

How Much Over an Estimate Can a Contractor Go Without Your Approval?

Understanding how much over an estimate a contractor can go matters when your renovation bill arrives higher than expected. There is no nationwide per Read more of this blog post »
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