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Planning Custom Garden Structures: Sizes, Colours and Configurations
A made-to-measure garden structure starts with its purpose, site and available circulation space, not a model number. This guide explains how to coordinate size, form, colour, doors, ventilation, foundations, delivery and installation.
A custom garden structure should not be chosen solely because a version looks good in a photograph. What matters is whether a greenhouse, orangery, pergola or outdoor sauna will work soundly at the intended site. Consider use, external dimensions, circulation, property access, foundation and equipment together.
“Custom-made” does not automatically mean that every dimension or component arrangement can be manufactured. Configurations often use a structural system with defined profiles, bays, roof forms and connection points. Good planning combines individual requirements with technically available options.
Start with the intended use
First define what will actually happen in the structure. A greenhouse used only for propagation needs different paths and ventilation from an orangery with seating. A pergola over a dining area is sized differently from a narrow cover beside the house. For a sauna, access, changing space, privacy and required services also matter.
For greenhouses, also decide whether you will mainly work in ground beds, raised beds or on growing benches. Anyone planning leafy greens can find typical use scenarios in the guide to growing lettuce in a greenhouse . Temperature management and air exchange are covered in the article on greenhouse temperature and humidity .
Write down the main purpose and two possible secondary uses. A greenhouse may later become a sheltered sitting area; a pergola may accommodate an outdoor kitchen as well as a dining table. Such additions affect the area required and should be considered before ordering.
Choosing the right size
External area alone says little about practical usability. Posts, profiles, doors, roof slopes, planting areas and furniture determine how much space remains usable. Plan the size in four steps.
1. Measure the site, not just the lawn
Record length and width at several points. Boundaries, walls and older buildings are not always exactly parallel. Note slopes, steps, drainage channels, inspection chambers, downpipes, eaves, roots and underground services. Also check that doors and windows on adjoining buildings can open fully.
Light levels are also part of the site survey. Observe the location at different times of day where possible. For a planned orangery, the guide to orangery sizes and design offers further direction.
2. Draw a plan of usable internal space
Draw the footprint to scale and add every fixed and movable element. A greenhouse plan should include beds, tables, shelving and water containers. For a pergola, include the table, chairs, barbecue or outdoor kitchen. Allow not only for furniture dimensions, but also pulled-out chairs, open doors and working positions.
A main route should remain usable without constantly moving items. Dead ends and tight corners make maintenance, cleaning and moving larger plants harder. Planning should therefore follow how people move through the space, rather than filling every available area.
3. Allow for future use
Many garden structures are used longer than the original garden plan envisaged. Consider whether extra growing benches, larger pots, wider seating or technical equipment are likely. A modest reserve of space is often more practical than a configuration fully occupied from day one.
For saunas, consider more than the sauna room itself. The route from the house, a sheltered storage area and safe use in darkness or wet conditions form part of the overall concept. The Elma S outdoor sauna and the Elma L outdoor sauna can serve as size comparisons. The stated model information remains decisive.
4. Confirm model-specific dimensions
Do not transfer preferred measurements to a particular model without checking. Roof pitch, grid, profiles, doors and add-on parts can limit available sizes. Have the external dimensions, relevant internal dimensions, door openings and eaves confirmed for the exact configuration.
For pergolas, the pergola size guide supports early selection. For greenhouse structures, the overview of greenhouses and conservatories is a useful starting point. Order only from the final documented specification.
Freestanding, lean-to, T-shaped or pergola?
| Structure type | Typical benefit | Points to check |
|---|---|---|
| Freestanding | Flexible placement and access from every side | Foundation, wind exposure, access routes and surrounding clearances |
| Lean-to | Uses one side of the house and shortens routes to the building | Wall construction, connection height, roof drainage and windows |
| T-shaped | Separate functional zones and a striking focal point | More complex footprint, roof junctions and internal circulation |
| Pergola | Open transition between house, terrace and garden | Sun exposure, rainwater direction, side closures and anchoring |
A lean-to structure is not automatically the best choice for a small section. An unsuitable wall, low eave or necessary passage can remove its advantage. The comparison of a wall-mounted and freestanding pergola outlines the key planning differences.
Pergolas also require a choice between different roof concepts. The overview of a bioclimatic or classic pergola and guidance on when a bioclimatic pergola or glass roof suits can help with functional selection.
Configuration options to discuss
Make a list separating essential, desirable and optional items. This keeps planning technically clear and quotations comparable.
- Doors: number, handing, position and clear opening space.
- Ventilation: roof or side ventilation and how it will be operated.
- Glazing or panels: intended purpose, light effect, privacy and maintenance.
- Internal layout: paths, beds, shelving, seating and possible dividing zones.
- Drainage: location of gutters and downpipes, and discharge across the property.
- Shade and sun protection: orientation, operation and maintenance access.
- Pergola sides: open sides, privacy screening or weather-dependent closures.
- Sauna planning: door orientation, outdoor area, privacy and model-dependent equipment.
The choice of surface elements must suit the intended use. Information about polycarbonate, multiwall panels and insulation performance helps explain the terminology. Available materials and combinations must still be confirmed for the specific model.
Choosing colour and surface effect
Colour influences whether the structure reads as a distinct garden feature or visually connects with the house. Compare colour samples at the intended site where possible. Façade colour, window frames, roof covering, paving and planting all alter perception.
Dark colours can make profiles more visually pronounced, while lighter colours interact differently with reflective surfaces and their surroundings. These are design considerations, not technical claims. The actual available finish and colour range is decisive. Screen images and project photos are not colour-accurate because of lighting, camera settings and displays.
Those interested in traditional forms can find design inspiration in the article about Victorian greenhouses . An inspiration image should never replace the written colour specification and configuration.
Comparing aluminium structures and timber garden sheds
Start the comparison with the purpose. An aluminium greenhouse is designed for light transmission and plant cultivation. An enclosed garden shed may instead suit storage, a workshop or a more secluded living space.
Timber and aluminium differ in appearance, structural build-up and care requirements. Timber is a natural material whose surface needs regular inspection and, depending on the finish, treatment. Aluminium profiles need no timber preservative, but connections, seals, drainage routes and surfaces still need cleaning. The better system depends on use, desired transparency, site and willingness to maintain it.
Include these details in a quotation enquiry
- preferred structure type and main use;
- site sketch with measured lengths, heights and obstacles;
- photos from several directions;
- details of slope, ground conditions and existing foundations;
- preferred door, ventilation and drainage positions;
- colour and material preferences;
- delivery address and notes about narrow access or steps;
- planned installation route and available working area;
- unresolved questions about local requirements.
General procedures are explained under How to order . For questions about an individual configuration, visit Contact . A well-structured enquiry reduces follow-up questions but does not replace technical assessment.
Checking the final configuration
Do not assess a quotation only by total price or model name. Compare every line with your requirements list. Dimensions should clearly identify whether they are external, internal, base or opening measurements. Check the number and position of doors, windows, ventilation elements, drainage and accessories.
Also read the information on purchasing and delivery and the applicable warranty information. When two quotations appear similar, compare each line in a table. Small differences in form or equipment can matter greatly in everyday use.
Planning site, delivery and installation
Before foundation or installation work, check whether building consent, resource consent, district-plan controls or other requirements apply. A building-consent exemption does not settle every planning issue. Ask the council about the specific greenhouse, pergola or sauna. The guide to building consent for a greenhouse or pergola , which offers a starting point; your council must confirm the site-specific requirements.
Delivery access checklist
- Can the access route accommodate the planned delivery method?
- Do gates, bends, branches, overhead lines or parked vehicles create obstacles?
- Can the goods be moved safely from the unloading point to the installation site?
- Is there a level, dry and protected temporary storage area?
- Can long or delicate components be handled along the entire route?
- Have steps, narrow paths and soft ground been reported in advance?
Assess these points against the actual delivery, not a previous garden-furniture delivery. Component dimensions and packaging can differ substantially.
Typical installation sequence
- Approve the plan: confirm the design, dimensions and accessories in full.
- Prepare the site: remove obstacles and establish heights and square reference lines.
- Build the foundation: work only to the requirements of the confirmed structure. For pergolas, the pergola foundation guide is useful preparation.
- Check delivery: document packaging, allocation and visible discrepancies.
- Install the supporting structure: follow the sequence and alignment in the relevant documentation.
- Fit surface elements and accessories: coordinate doors, glazing, ventilation and drainage.
- Complete a final check: check opening functions, fixings, water routes and cleanliness.
Foundation and structure must be planned as one system. A foundation built too early can cause problems if confirmed external dimensions, post positions or heights differ from the initial assumption.
Care after installation
Inspect the structure regularly and after unusual weather events. Keep gutters, outlets and ventilation openings clear. Remove dirt with suitable material-compatible products and check that moving parts operate without obstruction.
The guide to caring for an aluminium greenhouse contains further advice. The care and maintenance instructions for the exact version remain decisive. General product information and more planning topics are collected under Useful information .
Frequently asked questions
Does “custom-made” mean any size is possible?
No. Structural grids, profile spacing, roof geometry, doors and engineering requirements set limits. “Custom-made” means an adaptable configuration within technically available options. Feasible dimensions must be confirmed for the model.
Should I choose the model first or measure the site?
Document the site and intended use first. Then select a suitable model family. Finally, check again that the specific model dimensions, doors and eaves fit within the measured area.
How much extra space should remain around the structure?
There is no universal figure. Allow space for installation, cleaning, drainage, door movement and access to adjoining components. Local boundary requirements may also apply. Set clearances according to the site and model.
Can the greenhouse colour be matched to the house?
A coordinated appearance is often possible if the preferred colour is offered for the model. Compare a real sample with the façade and window frames. Photographs and monitor colours are not colour-accurate.
Can doors and ventilation openings be repositioned?
This depends on the structural grid and selected version. Mark preferred positions on a sketch and have feasibility confirmed. Consider opening clearance, circulation, prevailing wind and access for operation.
Is a lean-to structure always better for a small garden?
No. Wall condition, windows, eaves, drainage and access may count against it. A compact freestanding solution can be more functional when it is easier to reach and maintain from all sides.
What is better for guests: an orangery or a pergola?
An orangery provides a more enclosed, light-filled room. A pergola creates an open transition to the garden. The right choice depends on the desired level of weather protection, ventilation, openness and seasonal use.
Can an inspiring project photo serve as a specification?
No. A photo does not show binding dimensions or every component, colour or construction detail. Use images for design coordination, but order only from a written, confirmed configuration.
When should I commission the foundation?
Only after the design, dimensions, heights and fixing points have been confirmed. The site can be surveyed and prepared beforehand, but the final foundation should follow the approved plan.
What should I do if two quotations look almost identical?
Compare external dimensions, interior space, doors, ventilation, materials, accessories, foundation requirements, scope of delivery and installation responsibilities line by line. Existing greenhouse reviews may provide additional guidance, but do not replace a technical assessment.
Can the configuration be changed after ordering?
Change options depend on the order stage and the individual order. Changes may have technical, timing or financial effects. Report a requested change immediately, and assume it has been made only once confirmed in writing.
Final decision checklist
- The main use and possible future use are defined.
- The site has been measured and photographed at several points.
- Internal routes, doors, furniture, beds and work areas are drawn in.
- Structure type, size, colour and equipment are confirmed for the model.
- Drainage, foundation and delivery access are planned.
- Locally applicable requirements have been checked with the relevant authority.
- The quotation and drawings have been checked line by line.
- Installation sequence, responsibilities and maintenance access are clear.
A sound decision comes from documented requirements, not isolated features. Compare the whole configuration and check that site, structure and planned daily use fit together. Further product categories such as garden saunas and models such as the HC150 barrel sauna can be assessed in the same way: start with use and site, then consider model and equipment.
