How Much Will House Extension Cost Philippines

House extension is common in the Philippines as we are used with extended family. It has been our tradition to live with our parents, or perhaps visit from time to time our parents. House extension is one way to save expenses as you would not need to buy another land area and experience all that additional stress when you want to start from zero in constructing a new house.

House or room extension construction cost is also similar with the way builders do a “quick” estimates. They often just multiply base amount with the floor area (that is the house extension cost per square meter method). Oftentimes, they will give you a detailed price construction breakdown to justify that claim. If they do not give you the construction cost breakdown when you already asked them, then, find another contractor. How to determine if you are talking to the right contractor? Click here.

In our example, we will assume that the owner wants to have additional room only. For a room to be completed, we will need two additional columns. By adding columns, we will also add its foundation and the wall footing foundation. Take note that the construction extension cost presented here are different for double stories extensions because double floor extension would require a sturdier foundation, a suspended slab, additional girders and beams.

For simplicity, we will assume the following:

1. There is an existing house and we will just add a room extension with toilet room inside.
2. The natural ground line is flat and is amenable to be constructed with a “typical” concrete columns and footings.
3. Existing house columns and beams are durable enough to be bolted with the extension’s roof framing structure. Also, the existing house’s columns will be perpendicular to the extension’s column.
4. Additional columns to be concrete, and additional room’s wall to be a plastered concrete hollow blocks.
5. House extension roof will have a single slanting face. See perspective picture above for visualization.
6. This is a 3m x 3.2m house extension. As shown in the plan below.

The extension room will have its own comfort room.

Now, we will dig deep into the technicalities so stay with us.

We will assume the dimension of the column to be 0.15m x 0.20m. With depth of 0.80m from the natural ground line. Height of the room will be 2.5m from the finish floor line. Since the foundation depth from the ground line is 0.8m and the assumed height to be 2.5m (plus 0.10 for the slab on grade), the total height of our two additional columns will be (0.8m + 0.10m + 2.5m = 3.40m) 3.40m. There will be no additional concrete roof beam, since the roof is just a single slanting plane, we will just use steel tube roof framing (please consult a professional if additional concrete roof beam is needed as steel framing has dimension limitations with respect to the thickness of steel used).

Roof framing will just be rectangular steel tube (ask a professional for the minimum thickness). Roofing sheet is advised to be like the existing roofs for uniformity. If you can find the same material and finish for the existing doors and windows, the better. Don’t know how to punchlist doors? Check our youtube shorts here.

We will put an exterior door so the occupant will have direct access outdoor and indoor. This will also serve as a quarantine room (God forbid, our world to have another pandemic). There will be four windows; three for the bed room extension and one for the toilet room. This solar lamp with powerbank has been very useful during the three months power outage in Cebu. Secure one now!

Since this is an extension, we will need to demolish a portion of the existing house for the entrance door from the extension room to the existing house. Thus, we will need to have demolition provision cost.

Below are the calculated average expenses when you want to extend your house in the Philippines.

CONCRETE AND MASONRY WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Excavation	2.3	cu.m.	500	1,140.75
16mm – DRB (columns and footings)	9	pcs	490	4,410.00
10mm – DRB (wall footing and stirrups)	10	pcs	160	1,600.00
Gravel Bed	0.66	cu.m.	1,400	922.60
4′ x 8′ – Plywood (formworks)	1	pc	450	450.00
8′ coco lumber	11	pcs	90	990.00
Cement (concrete works)	17	bags	240	4,080.00
Sand (concrete works)	0.91	cu.m.	1,400	1,280.30
Gravel (concrete works)	1.83	cu.m.	1,400	2,560.60
4″ Concrete Hollow Blocks	264	pcs	14	3,696.00
Cement (CHB works)	14	cu.m.	240	3,272.22
Sand (CHB works)	1.04	cu.m.	1,400	1,454.32
10mm DRB (CHB & SOG works)	19	pcs	160	3,040.00
Cement (Plaster works)	16	bags	240	3,840.00
Sand (Plaster works)	1.5	cu.m.	1,400	2,100.00
miscellanous (tie wires, soil poision, etc)	1	lot		5,054.41
Total>>>				39,891.20

PAINTING WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Concrete Neutralizer	1.04	Gal	650	675.22
Concrete Sealer / Primer	2.08	Gal	650	1,350.44
Patching Compound	2.60	Gal	650	1,688.05
Semi-Gloss (2 coats)	4.16	Gal	650	2,700.88
Consumables	1	lot		1,282.92
Total >>>				7,697.51

TILING WORKS				
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
30cm x 30cm Tiles	95	pcs	45	4,275.00
20cm x 20cm Tiles (CR and Wall tiles @ 1.5m Height)	168	pcs	30	5,040.00
Cement	5	bags	240	1,440.00
Sand	0.39	cu.m.	1,400	546.00
Tile Grout	2	bags	40	80.00
Tile Adhesive	2.15	bags	260	557.70
Consumables	1	lot		1,790.81
Total >>>				13,729.51

OPENINGS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Door (Exterior Rear)	1	pc	6,000	6,000.00
Door (Toilet Room)	1	pc	3,000	3,000.00
Aluminum Window 0.5m x 0.5m (Comfort Room)	1	pc	2,000	2,000.00
Aluminum Window 1.2 x 0.5m	2	pcs	3,000	6,000.00
Aluminum Window 1.2m x 1.2m	1	pc	4,000	4,000.00
Total >>>				21,000.00

CEILING WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
1/2″ Fiber Cement Board – 4’x8′	7	pcs	950	6,650.00
Metal Studs / Double Furring	22	pcs	95	2,090.00
Wall Angle	9	pcs	42	378.00
Rivets	1989	pcs	0.8	1,590.53
Consumables	1	lot		1,606.28
Total >>>				12,314.81

CEILING PAINTING
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Jointing Mesh	1	roll	120	120.00
Primer Paint	1	Gal	650	650.00
Patching/Jointing Compound	1	Gal	650	650.00
Semi-Gloss (2 coats)	2	Gal	650	1,300.00
Consumables	1	lot		1,088.00
Total >>>				3,808.00

ROOFING WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
2″ x 4″ Rectangular Tube	3	pcs	1,200	3,600.00
2″ x 3″ C-Purlins	6	pcs	900	5,400.00
A-325 Anchor Bolts	8	pcs	350	2,800.00
Roofing Shingles (including flashing and gutters)	19	sq.m.	950	17,347.00
Red lead/Rust Converter	1	L	500	500.00
Others	1	lot		5,929.40
Total >>>				35,576.40

ELECTRICAL WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Lighting (interior and exterior)	4	units	350	1,400.00
Receptacles, Outlets, Switches	1	lot	3,500	3,500.00
Conduits and Wirings	1	lot	4,500	4,500.00
Miscellaneous	1	lot		1,410.00
Total >>>				10,810.00

PLUMBING WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Shower	1	set	1,500	1,500.00
Floor Drain	1	unit	300	300.00
Water Closet	1	set	4,000	4,000.00
Water Lines and Other Fixtures	1	lot	1,500	1,500.00
Sanitary and Waste Line	1	lot	1,500	1,500.00
Miscellaneous	1	lot		1,245.00
Total >>>				9,545.00

OTHER WORKS
Description	QTY	Unit	Unit Cost	Total Cost (PhP)
Demolition (Door size, access to existing house)	1	lot	1,500	1,500.00

We’ve added the materials breakdown so you can just change our assumed unit cost (based in your local construction prices) so you can get an amount that is closer to reality.

We won’t be giving the structural details plan so there is a need for you go to your nearest professional. Some contractors would say that P25,000 per sq.m. construction cost in the Philippines is just bare finish. But it is not always the case. Afterall, it still depends in the market condition. With the right contractor (provided that you got the one with the best value for money), you can construct a decent house with that base factor (but don’t expect it to be excessively beautiful). On the other hand, expect to shell out around P30,000+ per square-meter in the urban areas.

For this room extension cost guide to be of further help, here are the things to watch out for if you want to do house extension renovations in the future. Click here if you want to find way on how to reduce house construction cost.

1. Be sure that there is no important underground tank beneath the extension room like septic tanks, rainwater tank or grease traps. It would be a difficult and expensive if you have already developed/renovated it just to find out you need to do maintenance works on these tanks.
2. Be sure that the room extension is still within your property. There are setbacks that need to be followed. Ask a professional about it.
3. Be sure to properly seal roofing connections between the existing house and extension house. Since water will always find its way through tiny cracks and holes. Do necessary roof leak test before proceeding with the ceiling works.
4. New roof’s gutter will be properly tapped gutter to catch basin or area drain to prevent flooding.
5. There are no existing ground line embedment that may clash with the new sanitary and waste line. Seek advise to Master Plumbers or Sanitary Engineers as they can give you proper solutions in case there are.

To get a more accurate estimate, please consider consulting your trusted architects or contractors. They can give you all the help that you need including ocular inspection, specific offset requirements and detailed cost estimate based on your circumstance and location. Also, please do not argue with your chosen architect or builder if our computation is not close with theirs as they know better your local markets. IF they have proven good track records, please, believe them.

Keep in mind that you may need to obtain local planning permission and building permits especially for urban areas and you will not get pass through it if you would not hire a professional. It is essential to include these additional expenses when budgeting when extending your house.

Lastly, it is worth noting that house extension construction cost will always be influenced by the local market conditions, labor costs, availability of materials including the delivery costs and these prices vary per regions. It is always a good idea to gather multiple quotes from different reputable contractors, do due diligence and research thoroughly. Please, hire a professional.