diff --git a/projects/igniteui-angular/src/lib/directives/input/input.directive.spec.ts b/projects/igniteui-angular/src/lib/directives/input/input.directive.spec.ts
index 399cede3c4a..3683d183383 100644
--- a/projects/igniteui-angular/src/lib/directives/input/input.directive.spec.ts
+++ b/projects/igniteui-angular/src/lib/directives/input/input.directive.spec.ts
@@ -33,7 +33,8 @@ describe('IgxInput', () => {
                 RequiredTwoWayDataBoundInputComponent,
                 DataBoundDisabledInputComponent,
                 ReactiveFormComponent,
-                InputsWithSameNameAttributesComponent
+                InputsWithSameNameAttributesComponent,
+                ToggleRequiredWithNgModelInputComponent
             ],
             imports: [
                 IgxInputGroupModule,
@@ -247,6 +248,7 @@ describe('IgxInput', () => {
     });
 
     it('When updating two inputs with same attribute names through ngModel, label should responds', fakeAsync(() => {
+
         const fix = TestBed.createComponent(InputsWithSameNameAttributesComponent);
         fix.detectChanges();
 
@@ -319,6 +321,116 @@ describe('IgxInput', () => {
         fix.detectChanges();
         expect(firstInputGroup.nativeElement.classList.contains('igx-input-group--invalid')).toBe(true);
     }));
+
+    it('Should style input when required is toggled dynamically.', () => {
+        const fixture = TestBed.createComponent(ToggleRequiredWithNgModelInputComponent);
+        fixture.detectChanges();
+
+        const instance = fixture.componentInstance;
+        const input = instance.igxInputs.toArray()[1];
+        const inputGroup = instance.igxInputGroups.toArray()[1];
+
+        expect(input.required).toBe(false);
+        expect(inputGroup.isRequired).toBeFalsy();
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_REQUIRED_CSS_CLASS)).toBe(false);
+
+        dispatchInputEvent('focus', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+
+        input.value = '123';
+        dispatchInputEvent('input', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(false);
+
+        dispatchInputEvent('blur', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(false);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(false);
+
+        instance.isRequired = true;
+        fixture.detectChanges();
+
+        expect(input.required).toBe(true);
+
+        expect(inputGroup.isRequired).toBeTruthy();
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_REQUIRED_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('focus', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+
+        input.value = '';
+        dispatchInputEvent('input', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('blur', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(true);
+
+        input.value = '123';
+        dispatchInputEvent('input', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('blur', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(false);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(false);
+    });
+
+    it('Should style input with ngModel when required is toggled dynamically.', () => {
+        const fixture = TestBed.createComponent(ToggleRequiredWithNgModelInputComponent);
+        fixture.detectChanges();
+
+        const instance = fixture.componentInstance;
+        const input = instance.igxInputs.toArray()[0];
+        const inputGroup = instance.igxInputGroups.toArray()[0];
+
+        expect(input.required).toBe(false);
+        expect(inputGroup.isRequired).toBeFalsy();
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_REQUIRED_CSS_CLASS)).toBe(false);
+
+        dispatchInputEvent('focus', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+
+        input.value = '123';
+        dispatchInputEvent('input', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('blur', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(false);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(false);
+
+        instance.isRequired = true;
+        fixture.detectChanges();
+
+        expect(input.required).toBe(true);
+
+        expect(inputGroup.isRequired).toBeTruthy();
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_REQUIRED_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('focus', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+
+        input.value = '';
+        dispatchInputEvent('input', input.nativeElement, fixture);
+        dispatchInputEvent('blur', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('focus', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(true);
+
+        input.value = '123';
+        dispatchInputEvent('input', input.nativeElement, fixture);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(true);
+
+        dispatchInputEvent('blur', input.nativeElement, fixture);
+        expect(input.valid).toBe(IgxInputState.INITIAL);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_INVALID_CSS_CLASS)).toBe(false);
+        expect(inputGroup.element.nativeElement.classList.contains(INPUT_GROUP_VALID_CSS_CLASS)).toBe(false);
+    });
 });
 
 @Component({ template: `
@@ -529,6 +641,26 @@ class ReactiveFormComponent {
     }
 }
 
+@Component({ template: `<igx-input-group>
+                            <label for="test" igxLabel>Test</label>
+                            <input name="test" type="text" igxInput [(ngModel)]="data" [required]="isRequired"/>
+                        </igx-input-group>
+                        <igx-input-group>
+                            <label for="test" igxLabel>Test</label>
+                            <input name="test" type="text" igxInput [value]="data1" [required]="isRequired"/>
+                        </igx-input-group>` })
+class ToggleRequiredWithNgModelInputComponent {
+    @ViewChildren(IgxInputDirective)
+    public igxInputs: QueryList<IgxInputDirective>;
+
+    @ViewChildren(IgxInputGroupComponent)
+    public igxInputGroups: QueryList<IgxInputGroupComponent>;
+
+    public data = '';
+    public data1 = '';
+    public isRequired = false;
+}
+
 function testRequiredValidation(inputElement, fixture) {
     dispatchInputEvent('focus', inputElement, fixture);
     inputElement.value = 'test';
diff --git a/projects/igniteui-angular/src/lib/directives/input/input.directive.ts b/projects/igniteui-angular/src/lib/directives/input/input.directive.ts
index 959426820fd..e7e279ff909 100644
--- a/projects/igniteui-angular/src/lib/directives/input/input.directive.ts
+++ b/projects/igniteui-angular/src/lib/directives/input/input.directive.ts
@@ -24,7 +24,8 @@ export enum IgxInputState {
 }
 
 @Directive({
-    selector: '[igxInput]'
+    selector: '[igxInput]',
+    exportAs: 'igxInput'
 })
 export class IgxInputDirective implements AfterViewInit, OnDestroy {
     private _valid = IgxInputState.INITIAL;
@@ -92,6 +93,40 @@ export class IgxInputDirective implements AfterViewInit, OnDestroy {
     public get disabled() {
         return this.nativeElement.hasAttribute('disabled');
     }
+
+    /**
+     * Sets the `required` property.
+     * ```html
+     * <input-group>
+     *  <input igxInput #igxInput [required]="true">
+     * </input-group>
+     * ```
+     * @memberof IgxInputDirective
+     */
+    @Input()
+    public set required(value: boolean) {
+        if (typeof value === 'boolean') {
+            this.nativeElement.required = this.inputGroup.isRequired = value;
+
+            if (value && !this.nativeElement.checkValidity()) {
+                this._valid = IgxInputState.INVALID;
+            } else {
+                this._valid = IgxInputState.INITIAL;
+            }
+        }
+    }
+
+    /**
+     * Gets whether the igxInput is required.
+     * ```typescript
+     * let isRequired = this.igxInput.required;
+     * ```
+     * @memberof IgxInputDirective
+     */
+    public get required() {
+        return this.nativeElement.hasAttribute('required');
+    }
+
     /**
      * Sets/gets whether the `"igx-input-group__input"` class is added to the host element.
      * Default value is `false`.
@@ -227,16 +262,6 @@ export class IgxInputDirective implements AfterViewInit, OnDestroy {
             }
         }
     }
-    /**
-     * Gets whether the igxInput is required.
-     * ```typescript
-     * let isRequired = this.igxInput.required;
-     * ```
-     * @memberof IgxInputDirective
-     */
-    public get required() {
-        return this.nativeElement.hasAttribute('required');
-    }
     /**
      * Gets whether the igxInput has a placeholder.
      * ```typescript
@@ -287,6 +312,18 @@ export class IgxInputDirective implements AfterViewInit, OnDestroy {
     public get valid(): IgxInputState {
         return this._valid;
     }
+
+    /**
+     * Gets whether the igxInput is valid.
+     * ```typescript
+     * let valid = this.igxInput.isValid;
+     * ```
+     * @memberof IgxInputDirective
+     */
+    public get isValid(): boolean {
+        return this.valid !== IgxInputState.INVALID;
+    }
+
     /**
      * Sets the state of the igxInput.
      * ```typescript
diff --git a/src/app/input-group/input-group.sample.html b/src/app/input-group/input-group.sample.html
index c22bfdc6149..b03e0f4793c 100644
--- a/src/app/input-group/input-group.sample.html
+++ b/src/app/input-group/input-group.sample.html
@@ -2,6 +2,16 @@
 <div class="samples">
     <input-group-child-sample></input-group-child-sample>
 
+    <h3 class="sample-title">Line Style Input with required @Input</h3>
+    <form class="form">
+        <igx-input-group>
+            <label igxLabel>Required</label>
+            <input igxInput #myInput="igxInput" [value]="value" [required]="isRequired"/>
+            <igx-hint *ngIf="!myInput.isValid">This is required</igx-hint>
+        </igx-input-group>
+        <button igxButton (click)="toggleRequired()">Toggle required</button>
+    </form>
+
     <h3 class="sample-title">Line Style Input</h3>
     <form class="form">
         <!-- Basic text field -->
diff --git a/src/app/input-group/input-group.sample.ts b/src/app/input-group/input-group.sample.ts
index 50d44de4fff..67e8f618620 100644
--- a/src/app/input-group/input-group.sample.ts
+++ b/src/app/input-group/input-group.sample.ts
@@ -11,4 +11,11 @@ export class InputGroupSampleComponent {
         firstName: 'Oke',
         lastName: 'Nduka'
     };
+
+    public isRequired = true;
+    public value = '';
+
+    public toggleRequired() {
+        this.isRequired = !this.isRequired;
+    }
 }
diff --git a/src/app/time-picker/time-picker.sample.html b/src/app/time-picker/time-picker.sample.html
index a8d64a01316..72adefb9686 100644
--- a/src/app/time-picker/time-picker.sample.html
+++ b/src/app/time-picker/time-picker.sample.html
@@ -5,7 +5,7 @@
     <section class="sample-content">
         <article class="timepicker-column">
             <h4 class="sample-title">Time Picker with Dropdown</h4>
-            <div class="sample-description">{{showDate()}}</div>
+            <div class="sample-description">{{showDate(date)}}</div>
             <div class="preview" style="width: 200px">
                 <igx-time-picker #tp (onValueChanged)="valueChanged($event)"
                     (onValidationFailed)="validationFailed($event)" [mode]="mode" [isSpinLoop]="isSpinLoop"
@@ -16,7 +16,6 @@ <h4 class="sample-title">Time Picker with Dropdown</h4>
         <article class="timepicker-column">
             <h4 class="sample-title">Horizontal Time Picker</h4>
             <p class="sample-description">AM/PM Time format</p>
-            <p class="sample-description"> </p>
             <div class="preview">
                 <igx-time-picker format="h:mm tt"></igx-time-picker>
             </div>
@@ -51,5 +50,27 @@ <h4 class="sample-title">Templated Time Picker</h4>
                 </igx-time-picker>
             </div>
         </article>
+        <article class="timepicker-column">
+            <h4 class="sample-title">Templated Time Picker</h4>
+            <p class="sample-description">Time picker with required input group</p>
+            <div class="preview">
+                <igx-time-picker #templatedTimePicker [value]="today">
+                    <ng-template igxTimePickerTemplate 
+                                 let-openDialog="openDialog"
+                                 let-value="value">
+                        <igx-input-group [supressInputAutofocus]="true">
+                            <label igxLabel>Required</label>
+                            <igx-prefix (click)="openDialog()">
+                                <igx-icon>access_time</igx-icon>
+                            </igx-prefix>
+                            <input igxInput [value]="showDate(value)" [required]="isRequired"/>
+                            <igx-suffix igxRipple (click)="change()">
+                                <igx-icon fontSet="material">star</igx-icon>
+                            </igx-suffix>
+                        </igx-input-group>
+                    </ng-template>
+                </igx-time-picker>
+            </div>
+        </article>
     </section>
 </div>
\ No newline at end of file
diff --git a/src/app/time-picker/time-picker.sample.ts b/src/app/time-picker/time-picker.sample.ts
index 74ad38fbf74..d76b712c778 100644
--- a/src/app/time-picker/time-picker.sample.ts
+++ b/src/app/time-picker/time-picker.sample.ts
@@ -7,19 +7,29 @@ import { IgxTimePickerComponent, InteractionMode } from 'igniteui-angular';
     templateUrl: 'time-picker.sample.html'
 })
 export class TimePickerSampleComponent {
-    max = "19:00";
-    min = "09:00";
+    max = '19:00';
+    min = '09:00';
 
     itemsDelta = { hours: 1, minutes: 5 };
-    format = "hh:mm tt";
+    format = 'hh:mm tt';
     isSpinLoop = true;
     isVertical = true;
-    public mode = InteractionMode.DropDown;
+    mode = InteractionMode.DropDown;
 
     date = new Date(2018, 10, 27, 17, 45, 0, 0);
+    today = new Date(Date.now());
 
-    showDate() {
-        return this.date ? this.date.toLocaleString() : 'Value is null.';
+    isRequired = true;
+
+    @ViewChild('tp', { read: IgxTimePickerComponent })
+    public tp: IgxTimePickerComponent;
+
+    showDate(date) {
+        return date ? date.toLocaleString() : 'Value is null.';
+    }
+
+    change() {
+        this.isRequired = !this.isRequired;
     }
 
     valueChanged(event) {
@@ -29,7 +39,4 @@ export class TimePickerSampleComponent {
     validationFailed(event) {
         console.log(event);
     }
-
-    @ViewChild('tp', { read: IgxTimePickerComponent })
-    public tp: IgxTimePickerComponent;
 }