Steel & workshop materials
Steel Shed And Car Porch Estimator, Pakistan
A car porch looks like a simple structure, and the material list is simple enough once somebody has decided the column size, the beam span and how the roof drains. Those decisions are the engineering, and they are not something a web page should be making.
- Free, no sign-up
- Runs in your browser
- Built for Islamabad & Rawalpindi
This free calculator runs in your browser and needs JavaScript. If it does not load, call or WhatsApp us on +92 304 2435577 and we will do the calculation for you.
This estimator handles the quantities. Give it the covered area and the members your fabricator has specified, and it works out the sheeting to order, including slope and overlap allowances, and the structure steel with your rates applied.
What This Tool Does
It calculates the plan area, the sheeting area to actually order once slope and overlaps are allowed for, and the theoretical steel weight of the members you list, then prices the lot at your rates with a wastage allowance.
Who It Is For
- Homeowners pricing a car porch shade or shop canopy.
- Fabricators preparing a material list for a shed job.
- Contractors checking a canopy quote against its material content.
How To Use It
- Measure the area to be covered, width and length.
- Choose the type: car porch, shed or a smaller canopy.
- Set the slope allowance and the sheet overlap allowance. Sloped sheeting is longer than the flat plan, and profiled sheets overlap at every joint.
- Enter the members from your fabricator’s design, with sizes, lengths and quantities.
- Add your steel rate, sheet rate per square foot, wastage and labour.
Inputs And Units Explained
- Covered width and length — the plan area of the roof.
- Slope allowance — a percentage for the extra length of a sloped roof over its flat plan. Five per cent covers a gentle slope.
- Overlap allowance — ten to fifteen per cent extra sheeting is a normal allowance for side and end laps.
- Member rows — columns, beams and purlins as specified by your fabricator.
- Rates — steel per kilogram, sheet per square foot, plus labour and wastage.
How The Calculation Works
Sheeting is the plan area increased by the slope percentage and again by the overlap percentage. Structure steel is each member’s weight per metre, from its section geometry at 7,850 kg per cubic metre, times its length and quantity, with the wastage percentage added before pricing.
The tool does not size anything. It will not infer a column size from the span, because beam capacity, column sizing and anchoring are engineering questions, and a porch roof carries wind uplift as well as its own weight.
Worked Example
A 12 by 20 foot car porch with four 75 mm square columns, two rectangular beams and six purlins, as specified by the fabricator.
| Input or result | Value |
|---|---|
| Plan area | 240 sq ft |
| Sheeting to order | Plan area plus slope and overlap allowances |
| Structure | Columns, beams and purlins totalled by weight |
The sheeting figure is the one most often underestimated, because people order the plan area and discover the overlaps at the end. The structure weight gives you something concrete to compare between quotes.
Features And Benefits
- Slope and overlap allowances handled explicitly rather than forgotten.
- Structure steel totalled from the real member list.
- Sheeting and steel priced separately at your own rates.
- CSV export of the takeoff.
Assumptions And Accuracy Limits
- It does not size members, spans, foundations or anchors.
- Gutters, downpipes, flashing and fixings are not included unless you add them.
- Theoretical steel weights, with no welds or paint.
Common Mistakes To Avoid
- Ordering sheeting by plan area. Overlaps are real material and come to ten per cent or more.
- Reducing column or beam sizes to save money. Wind uplift on a canopy roof is substantial, and a porch that lifts takes the cars with it.
- Forgetting drainage. Water has to go somewhere, and deciding where after fabrication is expensive.
Steel Shed And Car Porch Planning For Pakistani Houses
A car porch or steel shed in Islamabad or Rawalpindi has to carry roof sheeting, resist wind and cope with heavy monsoon rain, so span, column spacing and roof slope all matter. Longer spans need heavier sections or more columns, and drainage must be planned.
Enter the width, depth and height of the porch and the tool estimates columns, rafters, purlins and roof sheet area, and the total steel weight. It is a planning aid, not a structural design.
Frequently Asked Questions
How much sheeting do I need for a car porch?
More than the plan area. Add for the slope, since a sloped roof is longer than its flat footprint, and for the side and end laps, which commonly adds another ten to fifteen per cent. The tool applies both allowances to your measurements.
Can this tool tell me what size columns I need?
No, and it states that in the results. Column and beam sizing depends on spans, roof weight and local wind, and must come from someone qualified who has seen the site.
Does it include the foundation?
No. Concrete pads or base plates and their fixings are separate, and they depend on the ground and the structure. Add them as their own cost.
How much steel is needed for a car porch?
It depends on the span, the number of columns and the roof sheet. The estimator adds up the members for your size.
Do I need an engineer for a large steel shed?
For large spans or heavy loads, yes. The estimator gives quantities, but structural design should be checked by a qualified engineer.
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Get A Measured Quotation
Spans, column sizes and anchoring need somebody who builds these regularly and has seen your site. Ramzan Steel Works fabricates car porches, sheds and canopies across Islamabad and Rawalpindi.