Home / Guides

Buying a House With a Basement Suite in Surrey or Langley

A suite can help carry the mortgage, but only if it is legal, insurable and counted by your lender. Here is how to check a suite in Surrey and the Township of Langley before you buy, what it costs each year, and what happens when a tenant already lives there.

By Shawn Kandola, PREC · Published November 5, 2026 · 8 min read

Legal suite or unauthorized suite: what it means here

In Surrey, a secondary suite is a self-contained unit with its own cooking facilities and bathroom, and its habitable floor area cannot exceed 40% of the main home. Only 1 suite is allowed per single family home, and a suite is not allowed inside a coach house or garden suite.

To legalize or install a suite, the City says the owner must meet the zoning, have the necessary building permits, meet the BC Building Code and pay the suite utility and service fees. Every suite must also be registered for fees, and the City bills $1,000 for each unregistered suite it finds. Registration and legality are different things: a seller can be paying suite fees on a suite that never had a building permit. Surrey's Secondary Suite Fee Web Inquiry tool shows whether a suite is registered; ask the seller for the permit and final inspection to show it was built legally.

In the Township of Langley, every secondary suite needs a building permit, whether it is added to an existing house or built with a new one. The Township's construction guide allows a suite inside a detached, fee simple single family home, caps it at 120 m² (1,291 sq ft) of finished living area, and requires an accepted final inspection before anyone lives in it. The City of Langley is a separate municipality with its own rules.

What Bill 44 changed, and what it did not

Bill 44, the Housing Statutes (Residential Development) Amendment Act, 2023, requires local governments across BC to allow at least 1 secondary suite or 1 detached accessory dwelling unit, such as a laneway home, in single family and duplex zones. In most areas of municipalities over 5,000 people, those lots must also allow 3 to 4 units, depending on lot size. Local governments had to update their bylaws by June 30, 2024, and Surrey has adopted zoning changes for small-scale multi-unit housing to match.

What it did not change: a suite still needs a building permit and must meet the BC Building Code, and Surrey still reviews each application for legal restrictions, such as land use contracts and building schemes, that prohibit suites on specific properties. Ask your lawyer or notary to check title for these before you remove subjects.

Fire separation and safety: what to look for at a showing

The Province's secondary suite guide, Home Suite Home, sums up the key Building Code requirements:

• Fire separation. The suite must be fully separated from the rest of the house by fire-protected walls, doors, floors and ceilings, and doors in a fire separation need a self-closing device. The required rating depends on the home's design, the number and type of smoke alarms, and whether there are sprinklers.
• Alarms. Smoke alarms are required in each unit and in common spaces, and carbon monoxide alarms in any home with a fuel-fired appliance or an attached garage. Unless the home is sprinklered, the alarms must be interconnected so they sound in both units. They must be hardwired for power, but the links between them can be wireless.
• Ceiling height. With some exceptions, the ceiling in a suite is generally no less than 2.1 m, and paths to exits under beams and ducts must meet minimum heights too. A basement that falls short usually needs major structural work before a suite can be legalized.

How lenders count suite income

For a CMHC insured mortgage on an owner-occupied house with 1 suite, CMHC's rules let the lender use up to 100% of the gross rental income from the suite when qualifying you. Insured mortgages are only available on homes priced below $1,500,000, the cap since December 15, 2024. With October 2026 detached benchmarks of $1,606,500 in White Rock and South Surrey and $1,448,100 in Langley, many detached homes here sit above that, which means an uninsured mortgage where each lender sets its own rental income policy.

Before you write an offer, ask your lender or broker 3 questions: will they count the suite rent, what share of it, and what proof they want, such as a signed tenancy agreement, an appraiser's market rent estimate or evidence the suite is permitted.

Do the math on the rent the tenant pays today. An existing tenancy carries over, and in BC the maximum rent increase is 2.3% for 2026 and 2.2% for 2027, once every 12 months with 3 full months' notice. If you buy a house without a suite and plan to add one, insured refinancing for a secondary suite has been available since January 15, 2025, up to 90% of the home's value after the renovation, amortized over up to 30 years, on homes valued up to $2,000,000.

Insurance

Tell your insurer about the suite before you remove subjects. The Province's suite guide says your home insurance will be affected if you build and rent out a suite, and the City of Surrey lists the ability to buy insurance as one of the benefits of a legal suite over an unauthorized one. Get the quote in writing for the house as it is, with the suite rented.

If a tenant already lives in the suite

Under BC's Residential Tenancy Act, a sale does not end a tenancy. When you complete, you become the landlord and the tenancy continues on the same terms. You may become responsible for returning the tenant's security or pet damage deposit even though the seller collected it, so deal with the deposits in the contract and at closing.

If you or a close family member will live in the suite, the steps are strict. A close family member means a parent or child of you or your spouse. Before taking possession you give the seller a written request, and the seller serves a Three Month Notice to End Tenancy for Purchaser's Use (RTB-32P), which must be generated through the Residential Tenancy Branch web portal. Serving that notice cannot be a condition of the sale. The tenant has 21 days to dispute it and is owed 1 month's rent as compensation.

The person moving in must do so within a reasonable time after the notice takes effect and live there for at least 12 months. If not, the purchaser who asked for the notice can be ordered to pay the tenant 12 months' rent. The Province's page on selling a rental property walks through each step in plain language.

What a suite costs each year

A suite may also raise your assessed value, and it can affect both your property taxes and your income taxes, so talk to your accountant before you count on the rent. For how these charges sit on a Surrey tax notice, see this guide to Surrey property tax.

Checklist for a house with a suite

When I write an offer on a suited home, I ask for the suite's permit history and the tenancy paperwork as part of the subject period. The full list:

• Check registration with Surrey's Secondary Suite Fee Web Inquiry tool, and ask for the building permit and final inspection.
• Have your lawyer or notary check title for building schemes, land use contracts or covenants.
• Look for fire separation, interconnected alarms and enough ceiling height.
• Ask your lender how much of the suite rent they will count and what documents they need.
• Get an insurance quote with the suite rented.
• Get the tenancy agreement, the current rent, the deposits held and the date of the last rent increase.
• Decide early whether you need the suite empty, so any notice is requested in time.
• Start your search with houses for sale in Surrey and homes for sale in Langley, then confirm every suite claim in the listing.

Frequently asked questions