Selling together with your neighbours: land assembly from the owner's side

Key takeaways

• Land assembly means a builder buys two or more neighbouring lots to plan them as one site.
• On a lot that abuts a Major Street, an apartment building can hold the greater of 60 homes or the lot's u number.
• A Major Streets townhouse with homes that do not front the street needs 30.0 metres of frontage, more than many single lots have.
• Away from a Major Street, the R zone allows one residential building per lot, so combining lots there adds less.
• Each owner signs their own agreement and should have their own lawyer.
• Your agent cannot share your price or plans outside the brokerage without your written consent.

Why a builder knocks on more than one door

Some owners hear from a builder who wants their lot and the one next door. Others hear that a neighbour has been asked, and wonder whether to join. Buying two or more neighbouring lots so they can be planned as one site is called land assembly. This guide looks at it from your side: why builders want it, what the rules allow on a combined site, how to plan a joint sale with your neighbours, and what can go wrong.

The builder's side of the same topic, with the full set of Major Streets standards, is in the Major Streets guide. Every rule here comes from a City of Toronto by-law or page, or a RECO document, that I read on November 1, 2026.

Why do builders want two or three lots together?

The main reason is width. Some building types need more frontage than one house lot has. Frontage is the width of a lot measured across it at the front setback, as the lot check guide explains. When two or three lots are combined, their widths add up.

By-law 1062-2025 shows the effect on a Major Street. In the RD zone, a townhouse where every home fronts directly on the street needs 6.0 metres of frontage for each home, reduced by 1.0 metre for each home that has no private driveway leading to its front. A townhouse with one or more homes that do not front on the street needs 30.0 metres. A lot narrower than that cannot hold the second form without a combined site or a variance.

A wider site also leaves room for things a narrow one cannot fit: a driveway to the back, space for garbage and bicycles, side yards and trees. A deeper or wider site can mean more homes, which can mean more for each owner. It can also mean a longer and more complex sale.

What can combined lots hold on a Major Street?

A Major Street is a street the City has named where small apartment buildings and townhouses can be allowed on house lots. Chapter 800 of the zoning by-law defines it as any street shown as Major Streets on the Policy Areas Overlay Map, and the City's Major Streets Study page says the rules apply to Neighbourhoods along the major streets on Map 3 of the Official Plan. The Ontario Land Tribunal decision of September 11, 2025 brought the rules into force.

The by-law also changes how a combined site is treated. In the R zone, clause 10.10.40.1(2) allows a maximum of one residential building on a lot, and more than one townhouse or apartment building on a lot abutting a Major Street. On a corner, clause 10.5.30.20(1)(C) makes the line along the Major Street the front lot line for a townhouse or apartment building.

Larger projects need enough water and sewer capacity. By-law 1062-2025 says no townhouse or apartment building on a lot abutting a Major Street may be built unless Toronto Water is satisfied that the mains and sewers can serve it. A site with 10 or fewer homes is exempt from that test. A builder may ask for time to check capacity before its offer becomes firm.

What if our street is not a Major Street?

Neighbours on other streets can still sell together, but the zoning gains are smaller. Away from a Major Street, the R zone allows one residential building per lot. A combined lot still follows the multiplex limits for its area: the City's Multiplex Housing page says four-unit multiplexes are permitted city-wide, and the multiplex zoning guide lists the areas where six are allowed. Some builders want two lots so they can split them differently, or build two multiplexes with a shared driveway. A lot split needs a consent from the Committee of Adjustment, the City panel that rules on splits and small exceptions to the zoning; the Committee of Adjustment guide explains the process.

How do neighbours plan a joint sale?

Each street is different. These are the steps I suggest to owners who want to explore a joint sale.

1. Talk to each other first. Find out who is willing to sell, on what timeline, and what each owner needs, such as a closing date that suits a move or a family plan.
2. Check each lot. Each owner should know their own frontage, depth, zone label and any exception. The combined frontage is the number a builder will ask for first.
3. Decide how you will be represented. Each owner can have their own agent, or several owners can use one brokerage with clear written rules on what is shared.
4. Bring in your own lawyers early. Each owner signs a separate agreement, with its own price, conditions and dates.
5. Present the combined site to builders. A builder needs the same facts for every lot: surveys, zoning, tenants and any mortgages.
6. Compare the offers together and separately. A good total for the site can still be a poor result for one owner if the price is split in a way that owner does not accept.

What should stay private between neighbours?

Owners in an assembly talk to each other, but each one still has private information: the lowest price they would accept, why they are selling, and the terms they need. RECO's Information Guide says your agent must keep that confidential and cannot share it outside the brokerage without your written consent, except where the law requires, even after the relationship ends.

If your neighbours use the same brokerage, ask how your information is kept apart. RECO's guide describes designated representation, introduced on December 1, 2023, where one or more named agents act for you and the rest of the brokerage treats you impartially. If the same agent also acts for the builder, that is multiple representation, which needs your written consent after a written disclosure.

How is the price shared between the owners?

Each owner in an assembly signs their own agreement of purchase and sale, so each agreement states its own price. The builder decides what it offers for each lot, and the owners decide whether to accept. No by-law sets how a price is split.

Builders and owners use different ways to compare the lots. Some compare by frontage, because frontage decides what the combined site can hold. Some compare by lot area. Some pay the same for each lot because each one is needed to build at all. A corner lot, a deeper lot or a lot with a lane behind it may matter more to one plan than to another. Ask the builder to explain in writing how it arrived at each price, so every owner can follow the same reasoning.

Owners sometimes agree among themselves on how they will compare offers, before any builder is involved. If you do this, write it down and show it to your lawyer. A side agreement between neighbours is a legal document, and it can affect what you are free to accept later.

A price for each lot is only part of the offer. Compare the deposit, the conditions, the closing date and what happens if the other sales fail. Two offers with the same price can leave one owner in a weaker position than the other.

What are the risks when sales depend on each other?

Most assemblies tie the sales together. A builder that needs three lots often makes each agreement depend on the others. That creates risks an owner selling alone does not face.

A combined site can be worth more than the lots sold one by one, but the gain depends on the zoning, the frontage and whether every owner closes. Ask your lawyer to read the conditions that link your sale to the others, and your accountant about the timing.

Questions to ask before you join an assembly

• Is our street a Major Street, and what would the combined frontage be?
• What does the builder plan, and does the plan need every lot?
• What happens to my sale if a neighbour changes their mind?
• Who knows my price, and who has agreed to keep it private?
• When would I close, and can I stay in my house until then?

The For Sellers page explains how I present a site to builders. For the price side, read how builders price land, and for offer terms, reading a builder's offer. My post on Missing Middle Housing describes the buildings these sites can hold. To talk about your street, use the contact page. Could your property be worth more planned together with the lot next door?

Frequently asked questions

Why does a builder want to buy my lot together with my neighbour's?

A builder wants your lot together with your neighbour's because some building types need more width than one house lot has. Under By-law 1062-2025, a townhouse on a Major Street with any home that does not front directly on the street needs a lot frontage of 30.0 metres. Two or three lots side by side can reach that width where one cannot.

What is land assembly when selling a house in Toronto?

Land assembly when selling a house in Toronto means a builder buys two or more neighbouring lots so it can plan them as one site. On a lot that abuts a Major Street, By-law 1062-2025 allows more than one townhouse or apartment building on the lot in the R zone, so a combined site can hold a larger project than each lot alone.

Could my lot and my neighbours' lots hold a small apartment building?

Your lot and your neighbours' lots could hold a small apartment building if the combined site abuts a Major Street and meets the zoning standards. By-law 1062-2025 allows an apartment building there of the greater of 60 homes or the lot's u number, up to the greater of 19.0 metres or the Height Overlay figure, and six storeys or the overlay figure.

Could our lots on a Toronto Major Street hold townhouses?

Your lots on a Toronto Major Street could hold townhouses if the combined frontage is wide enough. By-law 1062-2025 allows townhouses there up to the greater of 13.0 metres or the Height Overlay figure, and four storeys or the overlay figure. In the RD zone it sets a minimum of 6.0 metres of frontage for each home that fronts directly on the street.

Can neighbours sell together if their street is not a Major Street?

Neighbours can sell together on a street that is not a Major Street, but the zoning gains are smaller. Clause 10.10.40.1(2) of Toronto's zoning by-law allows a maximum of one residential building per lot in the R zone, with more than one only on a lot abutting a Major Street. A combined lot elsewhere still follows the multiplex limits for its area.

What happens if one neighbour decides not to sell in a land assembly?

If one neighbour decides not to sell in a land assembly, the builder may end the other agreements under their conditions or plan a smaller project on the lots it can buy. On a single lot, the City of Toronto's Multiplex Housing page says four-unit multiplexes are permitted city-wide. Ask your lawyer what your agreement says if the other sales do not close.

Should my neighbours and I use the same real estate agent?

You and your neighbours can use the same real estate agent, but ask in writing how your information is kept apart. RECO's Information Guide says a client's confidential information cannot be shared outside the brokerage without written consent. Under designated representation, introduced December 1, 2023, a named agent acts for you and the rest of the brokerage treats you impartially.

Can my neighbour find out what price I would accept from a builder?

Your neighbour cannot find out from your own agent what price you would accept from a builder unless you agree in writing or the law requires it. RECO's Information Guide lists the amount you would be willing to pay or accept, and your reasons for selling, as confidential information. That duty continues after the client relationship ends.

Why would a builder check the water and sewer lines before buying our lots?

A builder checks the water and sewer lines before buying your lots because a larger Major Streets project needs enough capacity to be built. By-law 1062-2025 says no townhouse or apartment building on a lot abutting a Major Street may be built unless Toronto Water is satisfied the mains and sewers can serve it. Lots with 10 or fewer homes are exempt.

Does each owner need their own lawyer when neighbours sell to one builder?

Each owner should have their own lawyer when neighbours sell to one builder, because each owner signs a separate agreement with its own price, conditions and dates. RECO's Information Guide tells clients to seek independent professional advice, for example from a real estate lawyer, before they agree to multiple representation. The same care applies when your sale depends on someone else's.

Does a new building on assembled lots have to face the Major Street?

A new townhouse or apartment building on assembled lots that abut a Major Street has its front lot line on the Major Street. Clause 10.5.30.20(1)(C) of By-law 569-2013, added by By-law 1062-2025, says the front lot line is the lot line abutting the major street. That matters on a corner lot, where the owner might expect the side street to be the front.

Sources

1. By-law 1062-2025(OLT), low-rise residential intensification on major streets. City of Toronto, under Ontario Land Tribunal order. Order issued September 11, 2025. Accessed November 1, 2026.
2. Major Streets Study. City of Toronto. Modified August 21, 2026. Accessed November 1, 2026.
3. Zoning By-law 569-2013, Chapter 10 Residential (office consolidation). City of Toronto. Version date July 31, 2024, with city-wide amendments up to April 30, 2026. Accessed November 1, 2026.
4. Zoning By-law 569-2013, Chapter 800 Definitions (office consolidation). City of Toronto. Version date July 31, 2024, with city-wide amendments up to April 30, 2026. Accessed November 1, 2026.
5. Multiplex Housing. City of Toronto. Modified August 26, 2026. Accessed November 1, 2026.
6. Working with a real estate agent: Things you need to know (RECO Information Guide, Residential). Real Estate Council of Ontario. Content December 1, 2023, graphics April 2025. Accessed November 1, 2026.

Planning and development potential is property-specific and subject to zoning, approvals, site conditions, municipal review and other due diligence. This guide gives general information. For legal, tax or financial advice, ask your own lawyer and accountant.