Slab foundation building in Cambridge MA - a level base for your new home or addition
Planning a new house or addition on a Cambridge lot? We check the ground first, then pour a reinforced slab that sits level.
- Fully licensed and insured.
- Free on-site estimates.
- Replies within 1 business day.
Is a slab foundation right for your Cambridge lot?
Slab foundation building in Cambridge means our crew places a reinforced concrete slab as the base of your new house or addition, and when the ground suits it, a slab goes in quicker and with less labor than other foundations.
You're planning something new, and before anyone frames a wall you need to know what it'll sit on. A slab only works when the ground is level across the property and the soil is well compacted, so that gets checked before you settle on one, and if the site doesn't suit it, a foundation on concrete footings may make more sense. The price moves with the size and thickness of the slab, how much digging and grading the site needs and whether radon features go in. The schedule turns on the permit, the weather on pour day and the curing wait while the concrete hardens enough to take weight. Your estimate spells out what's included and what isn't, so you'll see your own figure before we start.
What should you look at on your lot before choosing a slab?
Ground that slopes away
If the lot drops off noticeably across the spot where the building will go, a slab means a lot of grading, or a different kind of foundation altogether. Finding that out before the plans are drawn costs far less than finding it out once the excavator shows up.
Water pooling after rain
Puddles that sit near the house show you where water runs on your lot, and a new slab placed in that path can end up with water sitting against it. We'd rather plan the grade around it now than patch the drainage after the walls are up.
An old slab cracking or sinking
When an existing slab or addition on the property has cracked or dropped, the base under it was usually raked flat instead of dug out and packed. Building next to it or on top of it without fixing that usually means the same problem shows up in the new work.
How we handle slab foundation building
I walk the site with you before anyone settles on a slab, and I bring up radon-resistant features early, since the slab stage is when they're easiest to add. Then our crew digs out and packs the subgrade, the layer the slab sits on, and checks where water runs so the finished grade carries it away from the house. We set the forms and tie in rebar, the steel that holds the slab together and helps it carry the walls above. We pour early in the day because midday heat leaves a weak, dusty top. Once it's finished, we cut control joints, shallow lines that give the concrete a place to crack where we choose instead of across the middle. If the budget gets tight, I'd rather spend it on the base than on the surface, because the base is buried on day one and it's the part nobody can fix once the walls go up.
When a slab isn't the right fit, because the lot slopes or the plans call for a basement, foundation installation gives the building walls and footings instead, and I'll tell you at the estimate which way I'd go. The same dug-out base and drainage planning go into concrete parking lot building for owners who need paved space beside a new building.
Slab for an addition
This suits a room or wing going onto an existing house, where the new slab has to line up with the old floor and keep water away from the seam between them. We look at how the existing house sits before we set the height of the new slab.
Slab for a new house
This suits a new build on a level lot, where the slab carries the whole footprint and is the first thing the framers work from. It's also where planning drainage and radon features pays off most, because there's no older house to work around.
Get a free on-site estimate for your slab foundation
Send the form or call, and we'll reply within one business day to set a time for me to come out. The estimate is free, on site and there's no obligation to go ahead.
(617) 613-6953- Based in
- Cambridge, MA 02139
- Hours
- Mon–Fri: 7 AM–9 PM, Sat–Sun: 6 AM–9 PM
What happens after you call about a slab in Cambridge?
Here's how a slab job runs once you get in touch, from the first visit to the day it's ready to build on.
Call or send a message
Call (617) 613-6953 or use the form, and we'll set a time that suits you for me to come out to the site. Have a rough idea of the building's size so we can talk it through.
I measure and walk the site
I check how level the ground is, where water runs and what the building needs from the slab. The estimate I write up says what's included and what isn't, so you know what you're paying for before anything starts.
We sort out permits and pour
Once you're ready, we handle the permit and plan the pour around the weather, with me on site through the work. The city's noise rules allow construction from 7 a.m. to 6 p.m. on weekdays and from 9 a.m. to 6 p.m. on Saturdays and holidays, with no Sunday work, so the pour fits inside those hours.
We cut joints and let it cure
We cut the control joints and leave the slab alone through its curing wait, so nothing loads it before it's ready. Then we clean up and hand the slab over to whoever builds on it next.
Why Cambridge homeowners call M&K Cambridge Concrete Company for slab work
The owner at every estimate
I come out for every estimate, and I'm on site with our crew while the slab goes in. The person who measured your lot is the one watching the base get packed and the joints get cut.
Licensed in Massachusetts and insured
We're fully licensed and insured. That matters on a foundation because the city issues building permits only to construction supervisors licensed by the City of Cambridge or the State of Massachusetts, so any contractor you're weighing should be able to show you theirs.
Careful prep since 2023
We've been in business since 2023, and the work I watch closest is the grade, the drainage and the joints, the parts nobody sees once the concrete is down. If something under the slab looks off, I'd rather take an extra look than guess.
Under a foundation, the work you can't see decides how everything above it sits, so tell us about your lot and I'll come out to take a look.
Slab foundations, permits and historic review in Cambridge
The city's Inspectional Services Department issues building permits, and anyone building, altering, repairing or demolishing a structure has to get one before work starts. We check what your slab needs with that office, and when a permit applies, we take it out ourselves as your contractor and keep it posted where it's easy to see at the job site.
Your project also has to meet the city's zoning, and a house in a historic or neighborhood conservation district, a landmark or a property under a preservation restriction needs Cambridge Historical Commission approval too, so I ask about that at the first visit. Most slabs we see here go behind or beside older houses on tight lots, which means planning where the water runs so it doesn't end up against your house or a neighbor's. We see the same kind of lots and houses on jobs in Somerville and Brookline, and we plan the drainage the same careful way there.
Questions about slab foundations in Cambridge
How much does a slab foundation cost near Boston?
A reinforced concrete slab in the Boston area usually costs about $9 to $15 per square foot. That's a general market range for the slab, not our price for your site, which comes on the written estimate after I've measured and walked the lot.
How long does a new concrete slab take to cure before building on it?
A new slab is usually walkable within 48 hours, but Boston-area guidance puts full curing at a month. Waiting a week before heavier loads go on it is the safe choice, so build that week into your timeline before framing lumber or equipment shows up.
Should I pull my own building permit in Cambridge or let the contractor do it?
You can pull your own if you own a one or two unit house you live in or plan to live in, but the city encourages having a licensed contractor take it out. If you pull it yourself, you may be liable for contractors working on your property, and you give up protection under the Homeowners Improvement Contractor Law.
Does my Cambridge lot need flood protection for a new house or addition?
It does if the project falls under the city's Climate Resilience Zoning and the city's long-term flood levels for your lot sit above the ground. That zoning covers new buildings and enlargements that grow the footprint by at least 50%, not minor renovations or small additions, and those projects submit elevation drawings and a plan for protecting living and sleeping areas before the permit is issued. We bring it up early so it's in your plans from the start.
How do I add radon protection to a new slab foundation?
Ask for radon-resistant features before the slab is poured, because the EPA says adding them while a new home is built typically costs the builder less than fixing the home afterward. Once the concrete is down, building them in gets much harder, so they belong in the plans from the first conversation.
What should I have ready for a slab foundation estimate in Cambridge?
Have the site address, the planned size of the building or addition and whether the house is in a historic or conservation district. That lets me look into the right rules before I come out, and it keeps the estimate tied to what you're actually building.
Related concrete work for a new building
Foundation installation
A good fit if you want a basement or crawl space under the new building, or if the site needs walls and footings rather than one flat slab.
Concrete parking lot building
For a new building that needs room for cars or deliveries, a concrete lot built on a packed base handles the weight and sheds rainwater.
Cities we serve around Cambridge
M&K Cambridge Concrete Company is based in Cambridge, MA, and builds slab foundations across the cities around it, including Newton and Arlington. Each of the 12 cities below has its own page, and they aren't the only places we work.
Cambridge, MA
Have your lot checked before plans firm up
Knowing early whether the ground suits a slab lets your designer draw the right foundation the first time, so call (617) 613-6953 or send the form.