Construction Cost Breakdown Spreadsheet – Whether you are creating a competitive construction estimate for a bidding project, or just trying to figure out the costs for the construction, remodeling, or repair work you want to do, follow the steps below to ensure that Your construction costs and budgets are accurate and organized and complete.
Before you begin, review all the plans and specifications and consider whether you will need the services of suppliers or contractors to complete the task. If that is the case, give them the information they need to quote your construction or remodeling work as soon as possible. Usually waiting until the last minute causes the quote to be inaccurate.
In order to ensure that you have sufficient time to receive and review the prices of your suppliers and subcontractors, set a delivery date for quotes, which must be at least one day before the tender expiration date. Ask suppliers and subcontractors to make their proposals in writing and in detail. If time does not allow it, take detailed notes of the tenders given over the phone.
If possible, obtain at least three estimates. Construction costs and budgets for subcontractors typically cover a considerable scale of prices and if you have three estimates for each job, you can make a better informed decision about the number you should use in your construction budgets. As the quote process progresses, make sure your subcontractors receive any changes or revisions you make.
Once you have the estimates in your possession, prepare a comparison sheet and list the major items that subcontractors will include. Often, contractors who present estimates for the same job include different elements in their proposals. Use the comparison sheet as a guide to review and collate the quotes you receive. Add money to a contractor’s proposal for something it has excluded and others have included.
Make a summary of estimates for all your costs and tenders. Divide all costs into three basic categories:
The costs of building materials include all materials, labor, equipment, etc., needed to build a building (eg foundations, windows, roof).
Costs not related to construction or remodeling, also referred to as general conditions costs or general direct costs, include all materials, equipment and costs directly attributable to the construction of the work but are not a real part of it (for example , Temporary sanitation services, garbage containers, supervision costs, the cost of electricity for the project).
General overheads include other costs necessary to maintain your business, which are not directly attributable to the project (for example, rent, telephone, office electricity). Identify and quantify these costs and then increase your hourly labor rate to cover them or add a budget line to your construction budget for each project you are calculating.
General (non-production) costs may include 20 or 30 budget items, depending on the complexity of the project. Make a summary sheet and list the various costs and items you envisage. Many of these are directly related to the time taken to complete each task, so you should have an idea of the duration of the project. For example, if you estimate that you will need two temporary health services a week, you will need to know how many weeks you will use them to determine the total cost.
Once you have the costs of building materials and the general conditions, determine the partial total. Your profits, overhead, and insurance costs are usually calculated as a percentage of that total. Combine these costs with your partial total and you get the full estimated cost.
Calculate the cost of work now
Before you start any quantity deduction of the drawings, read the specifications in writing. Often, the specifications manual includes special requirements or important differences and you must note them before continuing.
When you begin reviewing plans to determine the amount of building materials and workers needed to do the work, these suggestions will help you stay organized:
First, check all the blueprints to get an idea of what the job will require.
When making your detailed deductions, use felt-tip pens or colored pencils to mark the drawings. So you know when you have included something.
There are many ways to obtain the amounts you will need to prepare the estimates. Some contractors use software programs, many use special business forms and others have created their own forms. In any of these you use, note the number of the sheet of the plane in the article. This has four objectives:
If you first calculate the quantities of all materials, it is easier to go back to allocate labor costs if you know the detail you were considering. Floor-level installation of a 2 × 4 wood around a window opening requires much less work than one to 40 feet in the air under an eave.
The detailed description and the additional sheet make it easier for someone to review your work.
In the event of a revision of the plan, you can easily compare the new details with the previous ones and verify the impact of the change.
When the project is under construction, you will be able to more accurately compare the actual costs of materials and fieldwork. If in your estimate the work appears in a lump sum, it will be impossible to determine where it was calculated in less and where in more.
When calculating quantities, be sure to know the scale used in the drawings and the details. Check scale with other flat sheets; Sometimes the architect scores an incorrect scale on the plans. If you think you are seeing drawings at a 1/4 inch scale and are actually 3/16 inch, your quantities will be wrong and this will significantly influence your labor and material costs.
Once you have calculated the amounts of building materials, add an appropriate amount for the waste material. Next, determine the cost of materials and labor to install them, as well as other related equipment costs.
Contact your supplier to find out about the building materials you need and if they do not give a price for the total amount, find out the prices per unit and determine the total costs of materials. For example, you need 434 feet of 2 × 4 pressure treated wood. Your vendor sells this material in 16-foot lengths, at $ 15 each. Divide 434 linear feet between 16 feet and round the figure to the next complete piece. In this case, you would need 28 2 × 4 lumber, 16 feet long, for a total of $ 420. Do not forget things such as screws, glue, sales taxes, delivery service charges and other incidental costs. Once the material costs have been calculated, proceed to calculate the labor costs.
Calculating labor costs requires experience. Concentrate first on the larger budget items, since an error in them can result in a large difference in total estimated costs. Depending on the amount of materials, try to determine the rate of production. For example, your project has a wood base of 1,250 linear feet. Calculate that your carpenter can measure, cut and install 20 feet of base per hour. Divide 1,250 feet out of 20 to determine you will need 63 hours. Remember that someone will download the material and distribute it to the various sections of the project. This also requires time, so you must add this additional time to the hours you calculated to install the base.
Multiply the hours per hour rate. Hourly rates vary widely but the basic points are the gross hourly wage, plus benefits, and state and local taxes. Many contractors add a value to the hourly rate to cover a portion of their overhead. Once you have the total number of hours for each budget line, add up the total hours and multiply them to get the labor costs.
The next thing you should consider for all construction budgets is the costs of construction equipment. Do you need to buy or rent a scaffold or perhaps a motorized raised basket? Once again, time is a key factor. Determine how much time the equipment will need to calculate the cost correctly.
Once materials, labor, and equipment costs have been completed, get the total cost for that section of the estimate. The goal is to include everything in a format that you can follow later, or use in future estimates for comparison purposes.
Finally, have your mathematical operations checked on the sheets of labor and material deductions, and prepare your tender.
If I had tender documents …
When you receive the tender documents, make sure you have everything you need, including instructions for bidders, plans, specifications, any attachments that may have been issued, as well as the geotechnical report, in case underground work is necessary .
Confirm the date and time of the tender, so that it arrives on time. Look for the dates and times of all mandatory inspections, so you do not miss them. Check who should pay the permit, if a payment / performance bond or a bond is required, and if the contract requires special insurance or liquidated damages.
Find out when the start of the work is scheduled and if some extra work time is required. This will help you determine if your estimate should include costs for special winter conditions.
If you have a bidding form, review it to see the data you are asking for. Often, the form will request the prices per unit, the costs of alternative of licitation or other costs or expenses that have to determine. Fill out in advance all sections of the bidding form that you can.
Try to calculate the duration of the project. Most bid forms require you to say how much you think the completion of the work will take, as many other costs are related to the time needed.
On the day of the bidding, make sure that you have followed the required instructions, such as the number of copies to be submitted, whether the envelopes need to be sealed, etc. And, finally, make sure you know where the bidding is headed and allow enough time to reach your destination. Do not forget to take traffic into account to make sure it will arrive on time.