UNDERPINNING COST CALCULATOR
For many years we have been lowering basements in Greater Toronto Area to extend living space and get the full use of house.
Get a free estimate from Rock Basements and convert unused space to extra square footage or rental income.
Potential Rebates for
up to $1750 for Sump Pump: To prevent newly excavated basement, sump pump is recommended to install. It is almost free, if you count the rebate from the city after installation.
up to $1250 for Backwater Valve: It is very cost efficient to install backwater valve while all drains are replaced and soil is already dug out. This upgrade is almost free.
up to $400 for Weeping tile: For the entire cost of basement underpinning, this rebate is less than 1% of work, but every little bit helps.
Detailed about rebates and process – Click Here
Areas We Serve
Our team performs basement underpinning mostly in Greater Toronto Area (where our office is located).
We are used to tight and complicated spaces to work around. Proud to serve the city of Toronto with what we do best!
Rock Basements goes as far as Halton Region to serve clients with underpinning and basement lowering services.
Many builders prefer underpinning with entire house renovation instead of building from the ground up in Oakville and Burlington.
Many buildings in Mississauga and Brampton are as old as some first neighbourhoods in Toronto area.
They have low height basements and crawlspaces that can be fully excavated to legal occupancy height.
Typical Additional Costs
May not be included in quote
1. Heated Floors: It makes sense to install heated floor system during underpinning before new concrete is poured.
2. Interior Demolition: Semi finished basements require demolition of walls and floor before excavation and concrete work begins.
3. Spec and Size Beams/Posts: Although we can order material for you, architects and engineers need to spec each structural beam/post.
4. Basement Walkout: We do make basement walkouts, but it is priced separately by architectural drawings (permit required).
5. Cuts for Windows: New basement can be designed with larger windows for legal rent purposes or yourself to enjoy more natural light.
Basement Lowering Cost Factors
Simply looking at the drawings we cannot give a detailed estimate.
Project manager needs to analyze site condition and access to basement. Preferably we have space to put disposal bin and conveyor belt.
Otherwise costs are going to go up for underpinning and excavation by hand.
Deeper we go, the more expensive the underpinning project is going to be.
It takes a week to excavate middle part of 800 sq ft basement and lower in by 2 feet. It takes double the effort and disposal cost when we go past 3 feet.
Deep excavation may have underground water.
There are several types of soil that make hand digging easier (sand) or harder (rocky clay).
Unfortunately we cannot always predict what type of soil is under your basement slab, but nearby projects can give us an idea.
Projects with access for machinery to excavate wont be affected as much by soil type.
Every basement lowering project has different scope of work and prices vary accordingly.
Some have only excavation and underpinning of foundation wall, while others need temporary supports, cut outs and beam installation.
To get better idea of full costs and breakdown ask our project manager.
Believe it or not, there are several methods of underpinning foundation wall.
We wont go into engineering details, pouring method and type of concrete, but possibilities and reasons can be explained on site.
The cost difference is not significant, but it adds up to overall underpinning price.
Have you heard before that hiring local company is the way to go?
It simply means that companies that don’t need to travel a lot can charge at less cost.
We know the soil, local regulation and are comfortable to perform underpinnings around Greater Toronto Area.
Rock Basements is always being asked by clients if we have financing options for basement underpinning work.
Unfortunately we do not offer financing options but can work with third party landers that deal directly with clients or general contractors.
As long as the terms of payment match or at least are close to what we ask for the job, we can work with any financial party.
Normally we break underpinning work payments into 4 parts which are due upon completion some stages.
First stage is deposit or start of underpinning. Other stages very, but go somewhere around completion for foundation walls and full excavation.
Last payment is due upon completion of entire project. We release engineer reports and permit right after.
For medium and large size construction projects such as basement lowering with walkout and other scope of work we may for a deposit.
It is simply guarantee the start date and align workers with equipment to be ready for the job.
Deposits are mandatory for home owners, builders and general contractors.
For larger projects that involve basement underpinning and other services such as walkout, addition and other scope we typically give discounts.
General contractors and home builders that work with us for now years may get discounted prices for some of the work as well.
Frequently Asked Questions
Rock Basements updates website and changes prices annually. We try to follow the costs and inflation as it goes up every year.
Unfortunately sometimes prices increase slightly mid year due to unexpected supply chain problems, COVID and other issues that affect construction in Ontario.
You can get exact cost of underpinning and basement lowering only with project manager based on existing drawings and site condition.
Costs may change on monthly basis and we are going to reflect them on estimates.
Website is updated annually with average prices for all work that we do in waterproofing, concrete and underpinning industry.
Rock Basements provide estimates that are valid for 2-3 month and we guarantee prices that are sent out to clients.
There are many factors that can drive up the prices in construction business and underpinning is not an exception.
Three main factors are:
- Material Cost Increase - when concrete, lumber, cinder block and other materials go up in price, our overall costs automatically increase.
- Increased Wages - Government of Ontario constantly increases minimum wages for workers and we have to stay competitive to keep the best guys in underpinning.
- Carrying Costs - with annual inflation, everything continues to go up. Business is not easy to maintain and at every corner there is an expense. We are talking about insurance, license fees, gas, office and even marketing.