Created on 08.21

Can an Existing Poultry House Be Upgraded from A-Type to H-Type Layer Cages?

Can An Existing Poultry House Be Upgraded From A-Type To H-Type Layer Cages?

The short answer is: sometimes, but the decision cannot be made from cage capacity alone. An existing A-type poultry house can be considered for an H-type layer cage upgrade only after its internal dimensions, structural capacity, ventilation arrangement, manure route, egg route, utilities, access and local market requirements have been checked as one system.

If these interfaces can be coordinated safely and economically, a retrofit may extend the use of the existing building and support a higher level of automation. If the house geometry or infrastructure creates too many compromises, a new poultry house may provide a clearer and more reliable result.

This guide does not replace structural, electrical or local regulatory approval. It explains what a farm owner and equipment supplier should verify before preparing a serious retrofit proposal.

First, Separate System Selection From Retrofit Feasibility

Our earlier guide explains the general differences between H-type and A-type layer cage systemsA retrofit study asks a different question: can a specific existing building support the selected H-type equipment and all the systems around it?

H-type cages use vertical space differently from stepped A-type rows. They also change the positions and operating requirements of feeding equipment, manure belts, egg belts, walkways, service platforms and ventilation paths. Removing the old cages creates an empty building, but it does not automatically create a building suitable for the new system.

The correct starting point is therefore not “How many more birds can fit?” It is “What can this house safely and practically support without weakening daily operation?”

1. Confirm The Market And Housing Rules Before Design Work

Before discussing rows and tiers, confirm whether the proposed housing system is permitted in the destination market and acceptable to the farm's customers. Cage rules differ between countries, and retailer or egg-buyer requirements may be more restrictive than the minimum law.

For example, the European Union has specific requirements for laying-hen housing, while the United Kingdom conducted a 2026 consultation proposing the phase-out of remaining caged systems. A project team should therefore verify current national law, transition periods, farm certification rules and customer commitments before investing in a retrofit.

This is not a paperwork detail to postpone until shipment. Market eligibility determines whether the equipment concept should proceed at all.

2. Measure The Usable House, Not Only The Outside Building

The supplier needs verified internal dimensions. External length and width do not reveal the actual installation envelope.

Record the following:

clear internal length, width and height;
column sizes, spacing and bracing positions;
beams, trusses and any low points below the roof;
doors, emergency exits and equipment openings;
internal walls, pits, drains and floor level changes;
fan, cooling-pad and air-inlet locations;
available space at the front and rear of each proposed cage row;
routes for unloading, assembly and future component replacement.

Laser measurements, photographs and a marked drawing are more useful than an unverified statement such as “the house is about 100 metres long.” Final row count, tier count and capacity must be calculated from the actual cage model and required service clearances.

3. Check The Structure And Floor For The New Load Path

An A-type and an H-type system transfer loads into the building differently. The retrofit review must consider the equipment itself, birds, feed, water, manure, access platforms and dynamic forces from operating machinery.

The equipment supplier can provide equipment loads and support-point information for the selected layout. A qualified local structural engineer should then verify the building frame, floor slab, foundations, corrosion condition and anchoring method against local codes and actual site conditions.

Do not assume that a concrete floor is automatically suitable. Floor thickness, reinforcement, flatness, cracks, drainage slope and embedded services all affect installation. If strengthening work is required, it must be included in the schedule and budget before equipment production.

4. Recalculate Ventilation For The Proposed Bird And Equipment Layout

Keeping the old fans while increasing installed capacity is not a ventilation design. A denser, multi-tier layout changes heat, moisture, gas and airflow distribution throughout the house.

The review should coordinate:

design bird capacity and live weight;
local summer and winter conditions;
fan duty and available static pressure;
cooling-pad area and water supply;
inlet quantity, position and control;
air movement across the lower, middle and upper tiers;
emergency ventilation and power-failure response;
sensor positions and control logic.

Existing fan openings may be reusable, relocated or replaced, but that conclusion requires an airflow assessment. A supplier should not promise an H-type retrofit before confirming that the climate-control concept can serve every tier.

5. Design Manure Removal From The Cage Belt To The Final Destination

H-type cages commonly use manure belts below the tiers. The retrofit plan must continue beyond those belts.

Confirm how manure leaves each row, crosses the house, passes through the wall and reaches storage, transport or treatment equipment. Check discharge height, conveyor position, weather protection, cleaning access, drainage and the space required outside the building.

If the farm wants drying or further treatment, the route should be coordinated with the wider poultry manure management system. A cage quotation that stops at the row-end discharge may leave the customer with an unresolved civil and logistics problem.

6. Rebuild The Egg Flow On Paper Before Installation

Changing cage rows changes egg movement. The study should show how eggs travel from every tier to the collection point without conflicting with doors, columns, feed equipment or staff routes.

Questions include:

Will each row use a lift or an elevator?
Where will cross conveyors run?
Is the egg room at the correct end and elevation?
Can transfer points be accessed for cleaning and adjustment?
Is there space for grading, packing or future expansion?
What happens if one downstream machine stops?

The final proposal should identify equipment interfaces and exclusions rather than using “automatic egg collection” as a single undefined line item.

7. Verify Feed, Water, Power And Control Capacity

An upgraded cage layout may increase the demand placed on the existing utilities. Confirm the complete route and capacity of each service.

For feed, review silo capacity, conveying distance, filling method, distribution route and headroom. For water, record source quality, available pressure, filtration, medication, flushing and drainage. For electricity, confirm voltage, frequency, phase, transformer capacity, generator provision, cable routes, earthing and protection.

Control cabinets, sensors and alarms also need suitable locations. Responsibilities for incoming power, field cabling, network connection and backup systems should be written into the supply scope.

8. Protect Access, Inspection And Emergency Routes

A layout is not acceptable merely because the cage frames fit between the walls. People must still be able to operate, inspect, clean and repair the system.

Check aisle widths, platform levels, stairs, handrails, headroom, motor access, belt-tensioning points and component-removal routes. Emergency exits must remain usable. Workers should be able to observe birds and drinker lines on every tier and reach maintenance points without unsafe improvisation.

Space that appears "unused" in a drawing often performs an essential operational function. As the Tao Te Ching reminds us through the image of a vessel, usefulness depends not only on what is built, but also on the space that allows it to function. In a poultry-house retrofit, clear access is part of the equipment system, not wasted area.

9. Plan Removal, Civil Work And Production Downtime

Retrofit projects contain work that a new-house quotation may not include:

depopulation and biosecurity clearance;
dismantling and disposal of the old cages;
cleaning and disinfection;
floor, wall, roof or structural repairs;
new openings and service penetrations;
utility relocation;
installation access and temporary storage;
testing, commissioning and operator training.

The farm should build a sequence around its flock cycle. Equipment delivery should not be scheduled before the site is ready to receive and store it safely. A practical turnkey layer farm planning process helps separate supplier work, local contractor work and customer preparation.

10. Compare Retrofit And New-Build Options On The Same Basis

A retrofit is not automatically cheaper simply because the walls and roof already exist. The correct comparison includes strengthening, demolition, repairs, revised ventilation, utility upgrades, installation complexity, downtime and any capacity lost to unsuitable geometry.

Retrofit Decision Checklist

Decision area	Evidence required before approval
Market eligibility	Current local law, certification and buyer requirements permit the intended housing system
House geometry	Verified internal drawing supports rows, tiers, aisles, service ends and installation access
Structure and floor	Local engineer confirms loads, supports, anchoring and any strengthening work
Climate control	Ventilation concept serves the proposed bird capacity and every tier in local conditions
Manure flow	Complete route is defined from cage belts to storage, transport or treatment
Egg flow	Collection, transfer, access and egg-room interfaces are coordinated
Utilities	Feed, water, electrical and backup capacity are verified
Operations	Inspection, cleaning, maintenance and emergency routes remain practical
Project sequence	Removal, civil works, delivery, installation and commissioning responsibilities are scheduled
Commercial scope	Inclusions, exclusions and interface owners are written into the proposal

Retrofit is more likely to be practical when the house has adequate clear dimensions, sound structure, usable service space, adaptable ventilation openings and sufficient utility capacity. A new house may be the stronger option when extensive strengthening is needed, the existing geometry restricts safe access, ventilation cannot be corrected economically, or the desired capacity forces too many compromises.

What Should You Send For A Preliminary Retrofit Review?

Start with the information already available:

country and farm location;
current and target bird capacity;
internal length, width and clear height;
structural drawings, if available;
photographs and video from both ends, all aisles and the exterior;
column, door, fan, cooling-pad and inlet positions;
floor condition and manure pits or channels;
existing feed, water, power and egg-handling systems;
desired automation level;

target flock and installation schedule;
destination-market and customer housing requirements.

Our commercial layer farm planning checklist can help organize the wider project information. After reviewing the building and operating conditions, the equipment team can prepare a preliminary layout, identify missing inputs and explain whether a retrofit study should continue.

Frequently Asked Questions

Can every A-type poultry house be converted to H-type cages?

No. Some houses may lack sufficient clear height, width, structural capacity, ventilation potential or service space. Feasibility must be confirmed from verified site information and the selected equipment configuration.

Can the old ventilation system remain unchanged?

It should not be assumed. The proposed bird capacity and multi-tier layout require a new ventilation review. Some components may be retained if their condition, duty and location fit the final design.

Does an H-type retrofit always increase capacity?

Not necessarily. The achievable capacity is limited by house geometry, legal stocking requirements, ventilation, access, manure and egg routes. A responsible layout protects these functions before maximizing bird numbers.

Who should verify the existing building structure?

The equipment supplier should provide relevant equipment loads and support information. A qualified local structural engineer should verify the existing building, floor, foundations and proposed modifications under applicable local codes.

Should the farm request a cage price before sending drawings?

A preliminary price range may be discussed, but a comparable project quotation requires house dimensions, target capacity, automation scope, utilities, climate and delivery information. Otherwise, important retrofit work and interfaces may be missing.

Conclusion

Upgrading an existing A-type poultry house to H-type layer cages is an engineering and operating decision, not a simple equipment replacement. The building, cage layout, ventilation, manure removal, egg transfer, utilities, access and project sequence must support the same plan.

The most reliable first step is to document the existing house honestly. Clear measurements and photographs may confirm a practical retrofit, reveal the modifications required or show that a new building is the better long-term choice. Each result is valuable because it prevents the project from moving forward on an unsuitable assumption.

To begin, review the H-type layer cage system and A-type layer cage system, then send your existing-house information through our project quotation page. Final layout, capacity, materials, equipment scope, delivery schedule and commercial terms remain subject to project-specific engineering review and written confirmation.

Author: Zhao Jinhong

Henan Daofeng Livestock Equipment Co., Ltd.