---
title: "Legal Basement Apartment"
url: https://www.londonrenovations.ca/legal-basement-apartment/
type: page
date: 2026-04-05
modified: 2026-04-05
markdown_url: https://www.londonrenovations.ca/legal-basement-apartment.md
---

# Legal Basement Apartment

![legal basement apartment renovations](https://www.londonrenovations.ca/wp-content/uploads/2025/08/legal-basement-apartment-renovations.webp) 
 

## Legal Basement Apartment Renovations in London, Ontario

 
 

#### Table of Contents

 
 
 
 Looking to add a **legal basement apartment** to your home in London, Ontario? At *London Renovations*, we specialize in **basement finishing and secondary suite conversions** that are fully compliant with the **Ontario Building Code** and **City of London by-laws**. Whether you’re planning to **rent it out** for extra income or create an **in-law suite** for family, we make the process seamless from permits to final inspection.

 
 

## Why Build a Legal Basement Apartment?

 
 ✔️ **Generate Rental Income** – Offset your mortgage with a secondary unit.✔️ **Boost Property Value** – Legal suites increase resale appeal and market value.✔️ **Safe & Compliant Living** – Meet fire code, egress, and safety standards.✔️ **Flexible Use** – Perfect for students, renters, or extended family.

 
 

## Our Basement Apartment Renovation Services

 
 We provide **turnkey solutions** for legal basement apartments in London, ON, including:

- **Basement Design & Architectural Plans** (layout, drawings, permits)
- **Full Basement Finishing** (framing, drywall, insulation, flooring)
- **Plumbing & Electrical Upgrades** (ESA-certified & city inspections)
- **Kitchen & Bathroom Installations**
- **Separate Entrance Construction** (side door, walkout, or interior upgrade)
- **Egress Windows & Fire Exits** (to meet Ontario Building Code)
- **Fire Separation & Soundproofing** (between units)
- **Heating & Ventilation Compliance**
- **Painting & Final Touches**

 
 

## See Our Recent Legal Basement Apartment Projects

 
 Check out our photo gallery for before-and-after pictures of legal second units, in-law suites, and basement conversions we’ve completed across London, ON.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

## Legal Requirements for Basement Apartments in London, ON

 
 Building a **legal basement apartment** (also called a **secondary suite** or **accessory dwelling unit**) in London, Ontario requires following the **Ontario Building Code (OBC)** and the **City of London’s zoning and by-law regulations**. Meeting these standards ensures your basement apartment is **safe, habitable, and legally rentable**.

A basement apartment in London, ON is considered **legal** if it:

- Meets the **Ontario Building Code**
- Passes all **city inspections**
- Has the proper **zoning approval** for a secondary unit
- Obtains all required **building permits**

Without meeting these requirements, the unit cannot be legally rented.

Here are the main **legal requirements** for a basement apartment in London, Ontario:

### 1. Ceiling Height

- The finished ceiling height must be at least **1.95 m (6’5”)** over most of the living area.
- Some lower ceiling areas (such as under beams or ducts) may be slightly less, but must comply with OBC allowances.

### 2. Separate Entrance

- The unit must have its own **private entrance** (side door, back entrance, walkout, or through a common vestibule).

### 3. Egress Windows

- All bedrooms must have a **proper egress (escape) window** large enough for occupants to exit in case of fire.
- Minimum window opening: **0.35 m² (3.77 sq. ft.)** with no dimension smaller than 15 inches.

### 4. Fire Safety & Separation

- The basement unit must have **fire-rated drywall** between the apartment and the rest of the home.
- **Smoke alarms and carbon monoxide detectors** must be installed in both units and interconnected.
- **Fire separation doors** may be required depending on layout.

### 5. Plumbing & Electrical Compliance

- All plumbing must meet code, with proper water supply and drainage.
- Electrical work must be inspected and certified by the **Electrical Safety Authority (ESA)**.

### 6. Heating & Ventilation

- The apartment must have adequate **heating and ventilation**.
- If using a shared HVAC system, proper fire dampers may be required.

### 7. Parking Requirements

- The City of London typically requires **one additional parking space** for the basement unit, unless located in certain exempted zones.

### 8. Permits & Inspections

- You must obtain a **building permit** before starting construction.
- The City of London will conduct inspections during and after construction to ensure compliance.

💡 *Our team takes care of the entire process — from design and permits to final approval.*

 
 

## How to Make Your Basement a Legal Secondary Unit in London, Ontario: Step-by-Step Guide

 
 

## STEP 1: Confirm Zoning & Property Eligibility

Before doing anything, confirm your property **is allowed** to have a legal basement unit.

### What to check:

- Property zoning (most residential zones allow **1 additional unit**)
- Detached, semi-detached, or townhouse eligibility
- Maximum number of units allowed
- Parking requirements
- Lot size and setbacks

### How:

- Contact **City of London Planning & Development**
- Or check online zoning map (GeoLondon)
- Ask specifically:
- “Is a basement ARU permitted at my address?”
- “How many units are allowed?”

✅ **Do this first** — zoning issues can stop the project entirely.

## STEP 2: Initial Design & Feasibility Review

Assess whether your basement **can physically meet code**.

### Key requirements:

- Minimum ceiling height:**6 ft 5 in (1.95 m)** clear height (may vary slightly with beams/ducts)

- Proper natural light:Windows size must meet OBC bedroom/living room requirements

- Separate entrance:
- Interior or exterior allowed

- Fire separation:Required fire-rated assemblies between units

- Soundproofing:OBC requires minimum sound transmission ratings

- Heating:Independent or shared system with controls

⚠️ If ceiling height is insufficient, **underpinning** may be required.

## STEP 3: Hire Qualified Professionals

You will likely need:

- **BCIN-qualified designer** (mandatory for permit drawings)
- Structural engineer (if underpinning or structural changes)
- HVAC professional
- Licensed electrician & plumber

### Drawings must include:

- Floor plans
- Fire separations
- Egress windows
- Plumbing & electrical layouts
- Mechanical ventilation
- Smoke/CO alarms
- Parking layout (if required)

## STEP 4: Apply for a Building Permit

This is mandatory.

### Where:

- **City of London – Building Division**

### Submit:

- Building permit application
- Construction drawings
- Designer Information Form
- Zoning confirmation
- Permit fees (based on square footage)

⏳ Review time:

- Typically **2–4 weeks** (can be longer)

🚫 **Do not start construction before permit approval**

## STEP 5: Fire Code & Life Safety Compliance

This is one of the most critical steps.

### Requirements include:

- **Fire separation**:Typically **30–45 minute fire rating**

- Self-closing solid core doors
- Smoke alarms in:Each bedroom
- Hallways
- Shared spaces

- Carbon monoxide detectors
- Fire blocking in concealed spaces

🔥 Fire inspections are strict — shortcuts fail inspections.

## STEP 6: Egress & Windows

Each bedroom must have **legal egress**.

### Minimums (typical):

- Window opening ≥ **0.35 m²**
- Minimum opening dimension ≥ **380 mm**
- No more than **1 m** from floor to window sill
- Window well must allow full opening

🚪 If no window meets this, **new egress windows must be cut**

## STEP 7: Plumbing, Electrical & HVAC

All systems must meet Ontario codes.

### Plumbing:

- Separate or shared systems allowed
- Proper venting
- Backwater valve (often required)

### Electrical:

- ESA inspection required
- Separate panel or sub-panel
- Arc-fault & GFCI protection

### HVAC:

- Heat source required for each unit
- Proper ventilation & fresh air supply

## STEP 8: Parking & Exterior Requirements

London typically requires:

- **1 additional parking space** per new unit
- Must be legal size & surface
- Cannot block sidewalks or fire routes
- Also:
- Exterior entrance must meet safety and zoning rules
- Proper grading & drainage

## STEP 9: Required Inspections (During Construction)

You must book inspections at each stage:

- Framing
- Plumbing rough-in
- Electrical (ESA)
- Insulation & fire separation
- Final building inspection

❌ Missing inspections can invalidate the permit.

## STEP 10: Final Approval & Occupancy

Once all inspections pass:

- City issues **final approval**
- Basement unit becomes a **legal dwelling**
- You may now:
- Rent it legally
- Insure it properly
- Advertise it openly

## STEP 11: Register Unit (If Required)

Some ARUs must be registered with the City.

- Property tax assessment updated
- Utility considerations
- Landlord obligations apply

## Common Mistakes to Avoid

❌ Starting work without a permit❌ Ignoring fire separation requirements❌ Illegal ceiling height assumptions❌ No egress windows❌ Unlicensed contractors❌ Skipping inspections

## Typical Timeline

- Planning & design: **2–4 weeks**
- Permit approval: **2–4 weeks**
- Construction: **6–12 weeks**
- Total: **3–5 months**

 
 

## Cost of a Legal Basement Apartment in London, Ontario

 
 Renovation TypeAverage Cost (London, ON)

Basement Finishing (non-legal)$20,000 – $50,000+

Legal Basement Apartment$50,000 – $95,000+

Full Secondary Suite Conversion$60,000 – $120,000+

*Pricing depends on basement size, condition, and desired finishes.*

 
 

## Client Reviews

 
 ⭐️⭐️⭐️⭐️⭐️*"London Renovations helped us build a legal basement apartment. They handled permits, city inspections, and now we rent it out to students — a smooth experience from start to finish!"*— Sarah M., London, ON

⭐️⭐️⭐️⭐️⭐️*"Our in-law suite turned out beautiful and fully legal. Professional and detail-oriented team."*— Daniel R., London, ON

 
 

## Service Areas – Legal Basement Apartment Renovations Near You

 
 We provide **legal basement apartment renovations** in:

- **London, Ontario** (Byron, Hyde Park, Masonville, White Oaks, Stoney Creek, and all neighbourhoods)
- Surrounding areas: St. Thomas, Strathroy, Dorchester, Komoka, Ilderton

 
 

## Start Your Legal Basement Apartment Project Today

 
 Ready to create a **legal basement apartment** in London, ON? Trust *London Renovations* to deliver a **safe, code-compliant, and beautifully finished suite** that adds value to your home.

📍 [London Renovations](https://www.instagram.com/LondonRenovations.ca)📞 Call: 519-494-3673📧 Email: info@londonrenovations.ca🌐 [www.londonrenovations.ca](https://www.londonrenovations.ca)📅 [Book a Free On-Site Estimate](https://www.londonrenovations.ca/contact/)

 
 

## FAQ – Legal Basement Apartments in London, Ontario

 
 

### 1
 Do I need a permit for a basement apartment?

 ✅ **Yes.**You must obtain a **building permit** (and often plumbing/electrical permits) from the City of London **before** beginning work to create a legal basement apartment.

 

### 2
 What makes a basement apartment legal?

 A legal basement unit must:

- Comply with the **Ontario Building Code (OBC)**
- Meet London’s **zoning bylaws**
- Pass all required **city inspections**
- Have the proper **permits** approved before construction beginsIf any of these are missing, the unit is considered *illegal* and cannot be rented.

 

### 3
 Can I rent my basement without making it legal?

 ❌ **No.**Renting an illegal basement apartment can lead to *fines, penalties, and liability*. It’s also unsafe for tenants.

 

### 4
 What are the key building requirements?

 Here are the main standards:

**✔ Ceiling height**

- Minimum finished height ~**1.95 m (6’5″)** over most living areas.

**✔ Separate entrance**

- A private entrance (e.g., side door, walk-out) is required.

**✔ Egress windows**

- Bedrooms must have windows that meet egress size/opening rules (for fire escape).

**✔ Fire safety & separation**

- Fire-rated drywall and proper smoke/CO alarms are mandatory between units.

**✔ Electrical & plumbing compliance**

- Work must be ESA-certified and inspected.

**✔ Heating & ventilation**

- The unit must have adequate heating/ventilation per code.

**✔ Parking**

- Usually one extra parking space is required for the secondary unit, unless exempt.

 

### 5
 Are there zoning restrictions?

 Yes.London’s zoning by-law permits **secondary dwelling units** in basements *only* if specific zoning conditions are met — including finished floor level requirements (not below sanitary sewer level), minimum unit size (e.g., 25 m²), and other zone rules.

 

### 6
 How long does it take to complete a legal basement apartment?

 ⏱ **Typical timeline:** 8–16 weeks — depending on permits, design, construction and inspections.

(Another source from the same contractor notes ~6–12 weeks.)

 

### 7
 Do contractors help with permits and inspections?

 Yes — professional renovators like London Renovations handle **design, permits, construction, and city inspections** end-to-end.

 

### 8
 What if I already have tenants?

 If the unit isn’t legal, you *cannot rent it legally* until it’s brought up to code and permitted. Cities enforce standards to protect tenant safety and compliance. (Always verify with municipal staff directly.)

 

### 9
 What are typical costs?

 💰 Legal suite costs in London vary widely — usually **$50,000–$120,000+** depending on size, entrance work, utilities, and finishes.

 

### 10
 What documentation confirms legality?

 Ask for documentation such as:

- **Building Permit**
- **Inspection sign-offs**
- **ESA electrical certification**
- **Fire code compliance documentation**

These show the unit is legal and safe.

 

## London’s Trusted Basement Apartment Renovation Experts

 
 At *London Renovations*, we’ve helped homeowners across London and surrounding areas transform their basements into **legal, income-generating, and family-friendly living spaces**.

 
 
 
 

## Have any Questions?
Call us Today!

 
 

## 519-494-3673