A facade consultant sits on the design side and defines what the building envelope must achieve, while a facade contractor sits on the delivery side and is responsible for how it is achieved - that single sentence is the whole distinction between a facade consultant vs contractor, and confusing the two is where budgets, programmes and liability quietly unravel. The consultant writes performance criteria, reviews submittals and witnesses testing; the contractor engineers the system, produces shop drawings, fabricates, installs and carries the system warranty. On a well-run job the two roles interlock cleanly; on a badly scoped one, each party assumes the other owns a critical detail, and nobody does.
For most Indian projects the decision is really about risk and scale. On a landmark tower or a unitised curtain wall glazing package with bespoke profiles, an independent consultant protects you against a contractor optimising for their own margin. On a mid-rise commercial block in Hyderabad with a rational grid and standard systems, a capable design-build contractor offering design-assist can cover the same ground faster and at lower cost. The skill is matching the role to the project, not defaulting to the most expensive arrangement out of caution.
This guide sets out the boundaries so you can specify the right role, hold each party to the right deliverables, understand the real fee difference, and avoid paying twice for work only one party should own. It is written for architects, project managers and developers across Hyderabad, Secunderabad and the wider Telangana and Andhra Pradesh markets, with realistic INR figures and Indian standards throughout. If you want to pressure-test a detail before you tender, you can get a free quote and talk it through with an engineer.
What is a facade consultant, and what is a facade contractor?
A facade consultant is an independent building-envelope specialist appointed by the client or architect to define performance, review the design and safeguard the design intent. They do not build anything. Their value is expert judgement, independence and the ability to write a tender that a contractor can be held to.
A facade contractor is the firm that turns that intent into a physical envelope. They select or design the system, produce structural calculations and shop drawings, procure aluminium and glass, fabricate, install on site, and issue the warranty that covers weathertightness and structural adequacy.
The cleanest way to allocate scope is by deliverable, not by title. Map every facade output to one party before tendering and most arguments about responsibility disappear:
- Consultant: performance specification, thermal and condensation strategy, wind-load derivation from IS 875 Part 3, movement and deflection criteria, tender documentation, submittal review, mock-up witnessing and site-inspection reports.
- Contractor: system selection and structural calculations, shop and fabrication drawings, bracket and anchor design, thermal-break detailing, weatherproofing, sequencing, installation, and the system and product warranty.
- Shared or negotiated: interface details with RCC and steel, embed and cast-in coordination, tolerances between structure and facade, and the scope of the mock-up test regime.
Structural glazing detailing in India commonly references IS 2553 for the glass itself; the contractor sizes the glass make-up against your loads, but you should still state minimum thicknesses and safety-glass requirements in the tender. If you are engaging a specialist for the full glass facade work, many consultant-side tasks can be folded into a single design-build scope rather than split across two firms.
Performance criteria: who sets the targets, who proves compliance
You (or your consultant) set the targets; the contractor proves compliance through calculation, product data and testing. State absolute numbers, not adjectives, on your drawings and in the specification - 'good thermal performance' is not a contract, but 'U-value <= 1.8 W/m2K, SHGC <= 0.28' is.
- Thermal: U-value and SHGC ceilings aligned to ECBC and your IGBC, GRIHA or LEED target. In Hyderabad's composite-hot climate, SHGC is usually the binding constraint on west- and south-facing glazing.
- Daylight and glare: a VLT range, with a note that high VLT and low SHGC together push you toward a spectrally selective double-glazed unit.
- Acoustics: airborne sound reduction Rw (plus C and Ctr) for the glazed element, driven by nearby road or rail exposure - relevant on arterial corridors like the Outer Ring Road or near the Secunderabad rail lines.
- Structural: design wind pressure per IS 875 Part 3, serviceability deflection limits (commonly span/175 for framing supporting glass), and air, water and structural performance verified by mock-up per relevant ASTM methods.
- Fire and safety: perimeter fire-stopping at slab edges and safety-glazing locations per NBC 2016.
The division of labour here is strict: the architect or consultant owns the number, the contractor owns the evidence. If a mock-up fails a water test, the first question is always whether the criterion was clearly stated in the tender, because that determines who pays for the remedy.
Specification language: performance vs prescriptive
A performance specification states the outcome and leaves the contractor free to engineer the means; a prescriptive specification names the system, profile depth and product. Each shifts liability differently, and getting the mix wrong is a common source of variation claims.
- Performance spec advantages: transfers design responsibility to the contractor, invites value-engineered alternatives, and suits design-build procurement.
- Prescriptive spec advantages: certainty of appearance and detail, easier like-for-like tender comparison, and tighter control of sightlines and finishes.
- Most facade packages are hybrid: performance criteria for the physics (thermal, structural, water, acoustic) plus prescriptive control of visible profiles, finishes and glass make-up.
Whichever you choose, avoid mixing the two on the same element. A prescriptive profile paired with a performance U-value can leave the contractor unable to meet both without a substitution request, which becomes a variation and a programme delay. The same discipline applies to hardware: if you prescribe a particular patch fitting, spider or floor spring, name it precisely from a known range so the contractor can price and warrant it rather than substitute an unknown equivalent on site.
Facade consultant fees vs design-build cost in India
Cost is often the deciding factor, so it helps to see the two routes side by side. An independent facade consultant in India typically charges 1.5-3% of the facade package value, or a lump sum. On a mid-size commercial job in Hyderabad that lump sum commonly runs Rs 8-25 lakh depending on complexity, geometry and the number of site visits and mock-up witnessings required.
Against that, remember the consultant fee is additional to, not part of, the contractor's price - you pay for advice and independent review on top of the build. A design-assist or design-build contractor folds the engineering into the package, so you carry one commercial relationship instead of two.
- Indicative facade rates (supply and install, Hyderabad market): stick-system aluminium-and-glass curtain wall roughly Rs 1,600-2,600 per sqft; unitised systems Rs 2,800-4,500 per sqft; structural/spider glazing Rs 1,400-2,400 per sqft; ACP cladding roughly Rs 380-750 per sqft. Rates move with glass make-up, coating, and finish.
- On a 2,000 sqm (about 21,500 sqft) stick-curtain-wall package, the works alone might sit around Rs 4.3-5.6 crore; a 2% consultant fee on top adds roughly Rs 8.5-11 lakh.
- Below about 2,500 sqm of glazing on standard systems, that consultant fee often buys less risk reduction than simply appointing a contractor with a strong in-house engineering team and a solid track record - you can see the range of packages we deliver across our recent projects.
Above that threshold, or on unitised, double-skin and geometrically complex envelopes, the independent fee usually pays for itself in avoided rework and cleaner risk transfer.
When to hire a consultant vs a design-assist contractor
Scale, geometry and risk should decide. Use this as a first-pass triage, then adjust for client sophistication and programme pressure.
- Bring in an independent consultant when: the facade is unitised or bespoke, glazing area exceeds roughly 2,500 sqm, geometry is complex or double-skin, the project chases a demanding green rating, or the client mandates independent design review.
- A design-assist contractor is sufficient when: systems are standard (stick curtain wall, ACP, structural or spider glazing), the grid is rational, and early buildability input is worth more than independent oversight.
- Design-assist lets a contractor advise on system choice, thermal breaks and interfaces during your design-development stage. You keep authorship of the drawings while de-risking constructability and cost, and late substitution requests fall sharply because constraints surface before the drawings freeze.
Hakimi Aluminium and Glass provides design-assist, shop drawings, fabrication and installation for architects across Hyderabad, Secunderabad, Telangana and Andhra Pradesh, which lets specifiers pressure-test details and glass make-ups before a tender is locked. You can explore the full scope through our services to see where design-assist fits your package, or send drawings to get a free quote framed around your specific system.
Interfaces and handover: where facade projects actually fail
Most facade failures are interface failures, not product failures - and interfaces are exactly where consultant and contractor scope meet. Close them explicitly in the contract, because ambiguity here is the single biggest cause of leaks and disputes on Indian sites.
- Define structural tolerances early: RCC slab edges routinely deviate 15-25 mm, more than glazing tolerances allow, so bracket adjustability must absorb the difference.
- Fix responsibility for embeds and cast-in channels before the frame is poured; late anchors mean drilled fixings, revised calculations and lost programme.
- Require a visual and performance mock-up, and name in writing who witnesses and signs it off.
- Agree the water-test regime and remedial process in the contract, not on site after a failure.
- Nominate a single party for the slab-edge fire-stop and its interface with the spandrel.
Handover discipline matters just as much. A proper O&M manual should list every profile, gasket, sealant, coating and item of hardware used, so future maintenance teams can source like-for-like replacements rather than guessing years later when the original contractor has moved on.
Process and timeline: how the two roles sequence on site
Understanding when each party is active helps you programme the facade realistically rather than treating it as a single lump at the end.
- Concept and design development (weeks 1-6): consultant sets performance criteria and reviews options; a design-assist contractor, if appointed early, advises on system feasibility and budget.
- Tender (weeks 6-10): consultant issues the performance and prescriptive package; contractors price against clearly assigned deliverables.
- Post-award engineering (weeks 4-10 after award): contractor produces structural calculations and shop drawings; consultant reviews and returns comments.
- Mock-up and testing (weeks 8-14 after award): visual mock-up first, then a performance mock-up for air, water and structural loads, witnessed by the consultant or client.
- Fabrication and installation: lead time on aluminium profiles and coated glass is typically 4-8 weeks before the first panels reach site; a medium Hyderabad tower installs over several months in parallel with finishing trades.
Compressing shop-drawing review or skipping a performance mock-up to save two weeks is the classic false economy - it usually returns as a water-ingress claim in the first monsoon.
Common mistakes architects and developers make
Recurring errors on Telangana and Andhra Pradesh projects almost all trace back to unclear scope allocation between consultant and contractor.
- Writing adjectives instead of numbers - 'thermally efficient' or 'high performance' cannot be tendered or enforced.
- Leaving one deliverable (often the mock-up or the fire-stop) unassigned, so both parties price it out and nobody delivers it.
- Mixing prescriptive profiles with performance physics on the same element, forcing a substitution request.
- Appointing an expensive independent consultant for a small, standard facade where a design-build contractor would cost less and move faster.
- Selecting a contractor on lowest rate alone, without checking in-house engineering strength, past mock-up performance, or references you can actually visit.
- Deciding hardware and fittings late, so track capacity, floor-spring rating and glass thickness get coordinated on site instead of at fabrication.
A short procurement checklist prevents most of these: state U-value, SHGC, VLT, Rw, wind pressure and deflection as absolute numbers; assign every deliverable to exactly one party; decide performance vs prescriptive element by element; nominate who signs off the mock-up and water test; schedule hardware by make and model; and fix embed responsibility before the frame is poured. If you cannot answer all six, the gap is where your budget and programme will slip.
The Hyderabad, Telangana and Andhra Pradesh angle
Local climate and market conditions shape which role you actually need. Hyderabad's composite-hot climate makes SHGC control on west and south elevations the dominant thermal problem, which is a performance criterion the consultant or architect must state and the contractor must prove with the right coated double-glazed unit.
The regional supply chain is mature: Hyderabad and Secunderabad have established fabricators, and coated glass and system aluminium are readily available through Telangana and Andhra Pradesh distribution, which shortens lead times compared with more remote sites. That maturity is precisely why capable design-build contractors can often deliver standard commercial facades without a separate consultant.
- Wind: most of Telangana and Andhra Pradesh sits in moderate basic-wind-speed zones under IS 875 Part 3, but coastal AP districts near the Bay of Bengal demand higher design pressures and more conservative glass and anchor design - flag the site's zone in the tender.
- Monsoon: the June-September monsoon makes the water-test regime non-negotiable; specify it and witness it.
- Dust and cleaning: high ambient dust means access and cleaning strategy should be considered at design stage, not retrofitted.
For projects across the region, our team can review a draft facade package and flag unassigned scope before it reaches tender. Whether you engage us for design-assist, curtain wall glazing or complete glass facade work, the goal is the same: every deliverable owned, every number stated, and no gap for a leak or a dispute to grow in.
