diff --git a/src/commands/build/pagewriter.js b/src/commands/build/pagewriter.js
index ff32d884..d60e3d76 100644
--- a/src/commands/build/pagewriter.js
+++ b/src/commands/build/pagewriter.js
@@ -7,6 +7,7 @@ const UserError = require('../../errors/usererror');
 const { NO_LOCALE } = require('../../constants');
 const LocalizationConfig = require('../../models/localizationconfig');
 const TemplateArgsBuilder = require('./templateargsbuilder');
+const TemplateDataValidator = require('./templatedatavalidator');
 const { info } = require('../../utils/logger');
 
 /**
@@ -30,12 +31,20 @@ module.exports = class PageWriter {
      */
     this._templateArgsBuilder =
       new TemplateArgsBuilder(config.templateDataFormatterHook);
+
+    /**
+     * @type {TemplateDataValidator}
+     */
+    this._templateDataValidator =
+      new TemplateDataValidator(config.templateDataValidationHook);
   }
 
   /**
    * Writes a file to the output directory per page in the given PageSet.
    *
    * @param {PageSet} pageSet the collection of pages to generate
+   * @throws {UserError} on missing page config(s), validation hook execution 
+   * failure, and invalid template data using Theme's validation hook
    */
   writePages(pageSet) {
     if (!pageSet || pageSet.getPages().length < 1) {
@@ -51,7 +60,6 @@ module.exports = class PageWriter {
         throw new UserError(`Error: No config found for page: ${page.getName()}`);
       }
 
-      info(`Writing output file for the '${page.getName()}' page`);
       const templateArguments = this._templateArgsBuilder.buildArgs({
         relativePath: this._calculateRelativePath(page.getOutputPath()),
         pageName: page.getName(),
@@ -61,7 +69,15 @@ module.exports = class PageWriter {
         locale: pageSet.getLocale(),
         env: this._env
       });
+      
+      if(!this._templateDataValidator.validate({
+        pageName: page.getName(),
+        pageData: templateArguments
+      })) {
+        throw new UserError('Invalid page template configuration(s).');
+      }
 
+      info(`Writing output file for the '${page.getName()}' page`);
       const template = hbs.compile(page.getTemplateContents());
       const outputHTML = template(templateArguments);
 
diff --git a/src/commands/build/sitesgenerator.js b/src/commands/build/sitesgenerator.js
index a6b1a2fa..f7f9ae2e 100644
--- a/src/commands/build/sitesgenerator.js
+++ b/src/commands/build/sitesgenerator.js
@@ -178,10 +178,13 @@ class SitesGenerator {
 
       const templateDataFormatterHook = path.resolve(
         config.dirs.themes, config.defaultTheme, 'hooks', 'templatedataformatter.js');
+      const templateDataValidationHook = path.resolve(
+        config.dirs.themes, config.defaultTheme, 'hooks', 'templatedatavalidator.js');
       // Write pages
       new PageWriter({
         outputDirectory: config.dirs.output,
         templateDataFormatterHook: templateDataFormatterHook,
+        templateDataValidationHook: templateDataValidationHook,
         env: env,
       }).writePages(pageSet);
     }
diff --git a/src/commands/build/templatedatavalidator.js b/src/commands/build/templatedatavalidator.js
new file mode 100644
index 00000000..e811ceb2
--- /dev/null
+++ b/src/commands/build/templatedatavalidator.js
@@ -0,0 +1,48 @@
+const fs = require('file-system');
+const UserError = require('../../errors/usererror');
+const { isCustomError } = require('../../utils/errorutils');
+const { info } = require('../../utils/logger');
+
+/**
+ * TemplateDataValidator is reponsible for checking data supplied to a page
+ * using Theme's custom validation steps (if any).
+ */
+module.exports = class TemplateDataValidator {
+  constructor(templateDataValidationHook) {
+    /**
+     * The path to template data validation hook.
+     * @type {string}
+     */
+    this._templateDataValidationHook = templateDataValidationHook;
+
+    /**
+     * Whether or not the file for template data validation hook exists
+     * @type {boolean}
+     */
+    this._hasHook = fs.existsSync(this._templateDataValidationHook);
+  }
+  
+  /**
+   * Execute validation hook's function if file exists
+   * 
+   * @param {Object} page
+   * @param {string} page.pageName name of the current page
+   * @param {Object} page.pageData template arguments for the current page
+   * @throws {UserError} on failure to execute hook
+   * @returns {boolean} whether or not to throw an exception on bad template arguments
+   */
+  validate({ pageName, pageData }) {
+    if (!this._hasHook) {
+        return true;
+    }
+    try {
+        info(`Validating configuration for page "${pageName}".`);
+        const validatorFunction = require(this._templateDataValidationHook);
+        return validatorFunction(pageData);
+    } catch (err) {
+        const msg = 
+            `Error executing validation hook from ${this._templateDataValidationHook}: `;
+        throw new UserError(msg, err.stack);
+    }
+  }
+}
diff --git a/tests/commands/build/templatedatavalidator.js b/tests/commands/build/templatedatavalidator.js
new file mode 100644
index 00000000..001259b0
--- /dev/null
+++ b/tests/commands/build/templatedatavalidator.js
@@ -0,0 +1,107 @@
+const TemplateDataValidator = require('../../../src/commands/build/templatedatavalidator');
+const path = require('path');
+const UserError = require('../../../src/errors/usererror');
+
+describe('TemplateDataValidator validates config data using hook properly', () => {
+  const currentPageConfig = {
+    url: 'examplePage.html',
+    verticalKey: 'examplePage',
+    pageTitle: 'Example Page',
+    pageSettings: { search: { verticalKey: 'examplePage', defaultInitialSearch: '' } },
+    componentSettings: {
+      prop: 'example1',
+    }, 
+    verticalsToConfig: {
+      examplePage: {
+        prop: 'example2'
+      }
+    }
+  };
+  const verticalConfigs = {
+    page1: {
+      config: {
+        prop: 'example'
+      }
+    },
+    page2: {
+      config: {
+        prop: 'example2'
+      }
+    }
+  };
+  const global_config = {
+    sdkVersion: 'X.X',
+    apiKey: 'exampleKey',
+    experienceKey: 'slanswers',
+    locale: 'en'
+  };
+  const params = {
+    example: 'param'
+  };
+  const relativePath = '..';
+  const env = {
+    envVar: 'envVar',
+  };
+
+  it('does not throw an error with a correct config', () => {
+    const templateDataValidationHook = path.resolve(
+        __dirname, '../../fixtures/hooks/templatedatavalidator.js');
+    const templateData = {
+        currentPageConfig,
+        verticalConfigs : verticalConfigs,
+        global_config : global_config,
+        params : params,
+        relativePath: relativePath,
+        env: env
+    };
+
+    const isValid = new TemplateDataValidator(templateDataValidationHook).validate({
+        pageName: 'examplePage',
+        pageData: templateData
+    });
+    expect(isValid).toEqual(true);
+  });
+
+  it('throws an error when a field in config is missing', () => {
+    const templateDataValidationHook = path.resolve(
+        __dirname, '../../fixtures/hooks/templatedatavalidator.js');
+    const global_config_missing_key = {};
+    const templateData = {
+        currentPageConfig,
+        verticalConfigs : verticalConfigs,
+        global_config : global_config_missing_key,
+        params : params,
+        relativePath: relativePath,
+        env: env
+    }; 
+
+    const isValid = new TemplateDataValidator(templateDataValidationHook).validate({
+        pageName: 'examplePage',
+        pageData: templateData
+    });
+    expect(isValid).toEqual(false);
+
+  });
+
+
+  it('does not throw error, gracefully ignore missing config field in bad pages', () => {
+    const templateDataValidationHook = path.resolve(
+        __dirname, '../../fixtures/hooks/templatedatavalidator.js');
+    const params_missing_field = {};
+    const templateData = {
+        currentPageConfig,
+        verticalConfigs : verticalConfigs,
+        global_config : global_config,
+        params : params_missing_field,
+        relativePath: relativePath,
+        env: env
+    };
+
+    const isValid = new TemplateDataValidator(templateDataValidationHook).validate({
+        pageName: 'examplePage',
+        pageData: templateData
+    });
+    expect(isValid).toEqual(true);
+  });
+
+});
diff --git a/tests/fixtures/hooks/templatedatavalidator.js b/tests/fixtures/hooks/templatedatavalidator.js
new file mode 100644
index 00000000..17044b0f
--- /dev/null
+++ b/tests/fixtures/hooks/templatedatavalidator.js
@@ -0,0 +1,18 @@
+const { warn } = require('../../../src/utils/logger');
+/**
+ * A test data validator hook.
+ *
+ * @param {Object} pageData configuration(s) of a page template
+ * @returns {boolean} false if validator should throw an error
+ */
+ module.exports = function (pageData) {
+    if(!pageData["params"]["example"]) {
+        warn('Missing Info: param example in config file(s)');
+        return true; //gracefully ignore missing param on page
+    }
+    if(!pageData["global_config"]["experienceKey"]) {
+        warn('Missing Info: experienceKey in config file(s)');
+        return false;
+    }
+    return true;
+}