Short answer: a design fee should buy you a permit-ready set across five disciplines — architectural, structural, electrical, sanitary/plumbing, and mechanical where applicable — each signed and sealed by the professional the law requires, plus specifications and, if you intend to tender, a bill of quantities. Most disappointing design engagements are not badly drawn. They are incompletely scoped, and the owner finds out at the permit counter.
Ask one question: "Which of these drawings will be signed and sealed, and by whom?" A complete building needs an architect for the architectural documents and a civil engineer for the structural ones — RA 9266 does not let one cover the other. Electrical, sanitary and mechanical each need their own registered professional.
Three firms quote "complete plans" for the same house at ₱45,000, ₱80,000 and ₱160,000. The owner assumes the difference is quality or greed. Usually it is neither — it is scope.
The cheapest quote is often architectural drawings only, with the structural, electrical and plumbing sheets to be "coordinated later," which in practice means bought later from someone else, or drawn by a draftsman and signed by whoever will sign it. The most expensive includes the structural analysis, all four ancillary disciplines, the specifications, the bill of quantities and the permit filing. Those are not the same product, and no amount of comparing prices will reveal that if nobody itemises the scope.
The fix is unglamorous and completely effective: make every bidder quote against the same deliverables list. The builder below generates that list.
Generates the exact deliverables list for your project, names the licensed professional who must seal each set, shows which permit it unlocks, and puts a professional fee band against your construction value. Take the list to every firm you are considering.
This is not a professional turf preference. The Revised IRR of PD 1096 requires that plans and specifications accompanying a building permit application be prepared, signed and sealed by the appropriate registered and licensed professional. Each discipline has its own governing act.
| Document set | Who signs and seals | Governing law |
|---|---|---|
| Architectural documents | Registered and licensed Architect | RA 9266 — the Architecture Act of 2004 |
| Structural / civil documents | Registered Civil Engineer | RA 544, as amended by RA 1582 |
| Electrical documents | Professional Electrical Engineer (scope by classification) | RA 7920 — the New Electrical Engineering Law |
| Sanitary / plumbing documents | Sanitary Engineer or Master Plumber, by scope | RA 1364 and RA 1378 |
| Mechanical documents | Professional Mechanical Engineer | RA 8495 — the Philippine Mechanical Engineering Act of 1998 |
A Civil Engineer Cannot Sign the Architectural Set
Section 20.5 of RA 9266 provides that only registered and licensed architects may prepare, sign and seal architectural plans, designs, specifications, drawings and architectural documents. The Supreme Court has confirmed that RA 9266 impliedly repealed RA 544 insofar as it had permitted civil engineers to sign architectural documents. So when a single professional offers to seal your entire building set alone, that is not efficiency — it is a set that may be refused, and a professional exposed on the point. A complete building needs both, and any honest design firm will tell you so before you ask.
Site development plan, floor plans for every level, elevations on all sides, sections, reflected ceiling plan, schedules of doors and windows, and details. The schedules matter more than owners expect — a door schedule is what stops "door" from meaning whatever was cheapest that week.
Foundation plan, framing plan per level, column and beam schedules, the bar schedule, and the structural design analysis. That last item is the one most often missing from a cheap quote, and it is the one that proves the building was designed to NSCP seismic and wind provisions rather than sized by habit. In a country with our seismic exposure and wind loads, an unanalysed frame is a guess wearing a drawing.
Layouts, riser and isometric diagrams, load and fixture schedules, and the computations behind them. These are what the ancillary permits are issued against, and the IRR is explicit that a building permit is null and void without them. Our MEPFS guide covers how the disciplines interact; electrical service sizing and aircon tonnage sizing go deeper on two of them.
Layout, egress plan, and detection and alarm coverage appropriate to the building. This is what the BFP evaluates for the Fire Safety Evaluation Clearance, which sits in front of the building permit — not after it.
Specifications turn a drawing into a standard: concrete class, rebar grade, roofing gauge, paint system. Without them, "or approved equivalent" has nothing to be equivalent to. The bill of quantities is what makes competing quotes comparable — and what gives a variation an agreed rate two years later.
| Design-build | Design and contractor separately | |
|---|---|---|
| Contracts | One | Two |
| Who owns a drawing-vs-built clash | The design-build contractor | The owner, in the gap between them |
| Price transparency | Lower — design and build are bundled | Higher — the build is competitively tendered |
| Speed | Faster — construction can start on early packages | Slower — design completes, then tender, then build |
| Best when | The owner wants one accountable party and fewer decisions | The owner wants competitive pricing and will manage the interface |
Neither is universally correct. The honest way to choose is to ask who is going to resolve the argument when the drawings and the built work disagree — because that argument happens on almost every project. If the answer is "me, from overseas, at 2am," design-build is worth its premium. Our design-build contractor guide works through the trade-off, and if you are building from another country, the remote owner's playbook covers the payment and verification side.
A firm that answers all nine quickly and in writing is a firm that has done this before. Hesitation on questions two, three and nine is the reliable signal.
The signing and sealing requirements are legal, not conventional: RA 9266 for architectural documents, RA 544 as amended for civil and structural, RA 7920 for electrical, RA 1364 and RA 1378 for sanitary and plumbing, RA 8495 for mechanical, with the underlying requirement that permit documents be prepared, signed and sealed by the appropriate registered professional coming from the Revised IRR of PD 1096. The statement that RA 9266 impliedly repealed RA 544 as to architectural documents reflects Supreme Court rulings on the point. Construction value bands are AEDO 2026 planning ranges consistent with our house, commercial, warehouse and fit-out cost guides. The professional fee percentages are an industry planning band, not a published schedule — small projects are normally priced as a fixed fee by floor area instead. LGUs vary in the documents they request; confirm locally.
What should be included in a complete design package in the Philippines?
A permit-ready set covers five disciplines. Architectural — site development plan, floor plans, elevations, sections, schedules of doors and windows, and details. Structural — foundation plan, framing plans per level, column and beam schedules, the bar schedule, and the structural design analysis. Electrical — layouts, riser diagram, load schedule and the computation. Sanitary and plumbing — water supply and drainage layouts, isometrics and septic or treatment details. Mechanical where applicable — ventilation and air conditioning layouts with equipment schedules. Add the specifications, and for tendering a bill of quantities. A set missing any of these is not permit-ready.
Can a civil engineer sign architectural plans in the Philippines?
No. Section 20.5 of RA 9266, the Architecture Act of 2004, provides that only registered and licensed architects may prepare, sign and seal architectural plans, designs, specifications, drawings and architectural documents. The Supreme Court has confirmed that RA 9266 impliedly repealed RA 544, the Civil Engineering Law, insofar as it had permitted civil engineers to sign architectural documents. A complete building design therefore needs both an architect for the architectural documents and a civil engineer for the structural ones — they are not substitutes for each other.
How much should design cost as a percentage of construction?
Design, engineering and permit documentation commonly run about 5 to 10 percent of construction value, with the lower end applying to simple repetitive buildings and the upper end to complex or heavily serviced ones. Small projects break that rule, because the drawing set for a modest house is not much smaller than for a large one, so a percentage of a small construction value cannot pay for it. That is why most Philippine firms price small work as a fixed fee by floor area rather than as a percentage.
What is the difference between design-build and hiring a designer and contractor separately?
Under design-build one contract covers both design and construction, so responsibility for a clash between the drawings and the built work sits with one party. Under the traditional route the owner holds two contracts and also holds the gap between them, which is where most disputes live — the contractor says the drawings were wrong, the designer says the work did not follow them, and the owner pays to resolve it. Design-build trades a little price transparency for a single accountable party.
Do I need a bill of quantities if I already have drawings?
If you intend to compare more than one contractor, yes. Drawings tell bidders what to build; a bill of quantities makes them price the same list of items so the numbers can be compared line by line. Without one, three quotes are three different scopes and the cheapest is usually cheapest because it excluded the most. A priced bill of quantities is also what makes a variation arguable later, because there is an agreed rate to apply to the change.
Can a design firm build anywhere in the Philippines?
Design and permit documentation travel nationwide — a set signed and sealed by the appropriate PRC-licensed professionals is valid for filing anywhere in the country. Construction does not travel the same way, because it needs supervision, a labour force and supplier relationships in that locality. AEDO designs nationwide and delivers full design-build within Negros Oriental; outside the province we produce the complete design and oversee the builder you engage, rather than claiming to build in a place we do not have a team.
No "contact us for pricing" games. Every drawing signed and sealed by the professional the law requires, delivered anywhere in the Philippines — with full design-build under one contract in Negros Oriental.