These is a symfony form style for bootstrap3 horizontal forms

horizontal.html.twig

{% block form_row %}
    {%- spaceless %}
        {% set label_width = label_width|default(4) %}
        {#{% set attr = attr|merge({ 'class': (attr.class|default('') ~ ' form-control')|trim }) %}#}
        <div class="form-group{% if errors|length > 0 %} has-error{% endif %}">
            {% set label_class = (label_attr.class|default('') ~ ' col-sm-' ~ label_width ~ ' control-label')|trim %}
            {% set label_attr = label_attr|merge({ label_attr: { class: label_class } }) %}
            {{ form_label(form, null, label_attr) }}
            <div class="col-sm-{{ 12 - label_width }}">
                {{ form_widget(form, { attr: attr }) }}
                {{ form_errors(form) }}
            </div>
        </div>
    {% endspaceless %}
{% endblock %}

{% block checkbox_row %}
    {%- spaceless %}
        {% set label_width = label_width|default(4) %}
        <div class="form-group{% if errors|length > 0 %} has-error{% endif %}">
            <div class="col-sm-{{ label_width }}">
                {{ form_widget(form, { attr: { class: 'pull-right' } }) }}
            </div>
            <div class="col-sm-{{ 12 - label_width }}">
                {{ form_label(form) }}
                {{ form_errors(form) }}
            </div>
        </div>
    {% endspaceless %}
{% endblock checkbox_row %}

{% block form_label %}
    {%- spaceless %}
        {% if label is not sameas(false) %}
            {% if not compound %}
                {% set label_attr = label_attr|merge({'for': id}) %}
            {% endif %}
            {% if required %}
                {% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ ' required')|trim}) %}
            {% endif %}
            {% if label is empty %}
                {% set label = name|humanize %}
            {% endif %}
            <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
                {{ label|trans({}, translation_domain) }}
                {% if form.vars.required %}
                    <span class="required-star"> *</span>
                {% endif %}
            </label>
        {% endif %}
    {% endspaceless %}
{% endblock form_label %}

{% block form_widget_simple %}
    {%- spaceless %}
        {% set attr = attr|merge({ 'class': (attr.class|default('') ~ ' form-control')|trim }) %}
        {% set type = type|default('text') %}
        <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
    {% endspaceless %}
{% endblock %}

{% block button_widget %}
    {%- spaceless %}
        {% if label is empty %}
            {% set label = name|humanize %}
        {% endif %}
        {% set btn_type = btn_type|default('default') %}
        {% set class_name = (attr.class|default('') ~ ' btn btn-' ~ btn_type)|trim %}
        {% set attr = attr|merge({ 'class': class_name }) %}
        <button type="{{ type|default('button') }}" {{ block('button_attributes') }}>
            {% if button_icon is defined %}
                <span class="glyphicon glyphicon-{{ button_icon }}"></span>
            {% endif %}
            {{ label|trans({}, translation_domain) }}
        </button>
    {% endspaceless %}
{% endblock button_widget %}

{% block button_row %}
    {%- spaceless %}
        {% set label_width = label_width|default(4) %}
        {#{% set attr = attr|merge({ 'class': (attr.class|default('') ~ ' form-control')|trim }) %}#}
        <div class="form-group">
            <div class="col-sm-{{ 12 - label_width }} col-sm-offset-{{ label_width }}">
                {{ form_widget(form) }}
            </div>
        </div>
    {% endspaceless %}
{% endblock button_row %}

{% block submit_widget %}
    {% spaceless %}
        {% set type = type|default('submit') %}
        {% set btn_type = 'primary' %}
        {% set button_icon = 'floppy-disk' %}
        {{ block('button_widget') }}
    {% endspaceless %}
{% endblock submit_widget %}

{% block textarea_widget %}
    {%- spaceless %}
        {% set attr = attr|merge({ 'class': (attr.class|default('') ~ ' form-control')|trim }) %}
        <textarea {{ block('widget_attributes') }}>{{ value }}</textarea>
    {% endspaceless %}
{% endblock %}

{% block choice_widget %}
    {%- spaceless %}
        {% if expanded %}
            {% set attr = attr|merge({ 'class': (attr.class|default('') ~ ' checkbox')|trim }) %}
            {{ block('choice_widget_expanded') }}
        {% else %}
            {% set attr = attr|merge({ 'class': (attr.class|default('') ~ ' form-control')|trim }) %}
            {{ block('choice_widget_collapsed') }}
        {% endif %}
    {% endspaceless %}
{% endblock %}

{% block choice_widget_expanded %}
    {%- spaceless %}
        {% for child in form %}
            <div {{ block('widget_container_attributes') }}>
                {{ form_widget(child) }}
                {{ form_label(child) }}
            </div>
        {% endfor %}
    {% endspaceless %}
{% endblock choice_widget_expanded %}

{# this collection type handles addition and removal of #}
{% block collection_widget %}
    {%- spaceless %}
        {% if prototype is defined %}
            {% set attr = attr|merge({'data-prototype': form_widget(prototype, { label_width: label_width|default(4) }) }) %}
        {% endif %}
        <div {{ block('widget_attributes') }}>
            {% for row in form %}
                {{ form_widget(row, { label_width: label_width|default(4) }) }}
                {{ form_errors(row) }}
            {% endfor %}
            {{ form_errors(form) }}
        </div>
    {% endspaceless %}
{% endblock %}

{% block collection_row %}
    {%- spaceless %}
        {{ form_widget(form) }}
        {{ form_errors(form) }}
    {% endspaceless %}
{% endblock %}

{# symfony needed to hardcode the ":" in the widget... this is my answer #}
{% block time_widget %}
    {%- spaceless %}
        {% if widget == 'single_text' %}
            {{ block('form_widget_simple') }}
        {% else %}
            {#{% set vars = {}|merge(widget == 'text' ? { 'attr': { 'size': 1 }} : {}) %}#}
            {#{% set class_name = attr.class|default('') ~ ' input-group' %}#}
            {#{% set attr = attr|default({})|merge({ class: class_name }) %}#}
            <div {{ block('widget_container_attributes') }}>
                {%- spaceless %}
                    {{ form_widget(form.hour, widget_vars) }}
                    {% if with_minutes %}{{ form_widget(form.minute, widget_vars) }}{% endif %}
                    {% if with_seconds %}{{ form_widget(form.second, widget_vars) }}{% endif %}
                {% endspaceless %}
            </div>
        {% endif %}
    {% endspaceless %}
{% endblock %}

{% block date_widget %}
    {% spaceless %}
        {% if widget == 'single_text' %}
            {{ block('form_widget_simple') }}
        {% else %}
            {% set vars = widget_vars|default({}) %}
            {#{% set class_name = attr.class|default('') ~ ' input-group' %}#}
            {#{% set attr = attr|default({})|merge({ class: class_name }) %}#}
            <div {{ block('widget_container_attributes') }}>
                {{ date_pattern|replace({
                '{{ year }}':  form_widget(form.year),
                '{{ month }}': form_widget(form.month),
                '{{ day }}':   form_widget(form.day),
                })|raw }}
            </div>
        {% endif %}
    {% endspaceless %}
{% endblock date_widget %}

{% block datetime_widget %}
    {%- spaceless %}
        {% if widget == 'single_text' %}
            {{ block('form_widget_simple') }}
        {% else %}
            {% set vars = widget_vars|default({}) %}
            {#{% set class_name = attr.class|default('') ~ ' input-group' %}#}
            {#{% set attr = attr|default({})|merge({ class: class_name }) %}#}
            <div {{ block('widget_container_attributes') }}>
                {{ form_errors(form.date) }}
                {{ form_errors(form.time) }}
                {{ form_widget(form.date, vars) }}
                {{ form_widget(form.time, vars) }}
            </div>
        {% endif %}
    {% endspaceless %}
{% endblock datetime_widget %}

{% block form_start %}
    {% spaceless %}
        {% set class_name = attr.class|default('') ~ ' form-horizontal' %}
        {% set attr = attr|default({})|merge({ class: class_name, role: 'form' }) %}
        {% set method = method|upper %}
        {% if method in ["GET", "POST"] %}
            {% set form_method = method %}
        {% else %}
            {% set form_method = "POST" %}
        {% endif %}
        <form name="{{ form.vars.name }}" method="{{ form_method|lower }}" action="{{ action }}"{% for attrname, attrvalue in attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}{% if multipart %} enctype="multipart/form-data"{% endif %}>
        {% if form_method != method %}
            <input type="hidden" name="_method" value="{{ method }}" />
        {% endif %}
    {% endspaceless %}
{% endblock form_start %}