{"id":897,"date":"2026-10-05T06:32:32","date_gmt":"2026-10-05T06:32:32","guid":{"rendered":"https:\/\/klaaskoda.ee\/?p=897"},"modified":"2026-10-05T06:39:36","modified_gmt":"2026-10-05T06:39:36","slug":"winter-garden-building-permit","status":"publish","type":"post","link":"https:\/\/klaaskoda.ee\/en\/blogi\/winter-garden-building-permit\/","title":{"rendered":"Building a winter garden \u2014 do you need a building permit?"},"content":{"rendered":"

Short answer:<\/strong> under Estonian law, a winter garden built onto a private house is an extension of the house<\/strong>. If the winter garden increases the volume of the house by up to 33%<\/strong>, a building notice and a building design<\/strong> are enough \u2014 no building permit is needed. An extension of more than 33% requires a building permit. What matters is not the floor area of the winter garden but the percentage it adds to the volume of the house.<\/p>\n

The common belief that \u201ca winter garden over 20 m\u00b2 needs a building permit\u201d applies to a free-standing<\/strong> building, not to a winter garden attached to a house.<\/p>\n

Is a winter garden an extension or a separate building?<\/h2>\n

The Estonian Building Code defines an extension as construction that changes an existing structure by building onto, on top of or under it<\/strong> (Building Code \u00a7 4(2)). A winter garden built against the wall of a house is therefore an extension of the house.<\/p>\n

A free-standing winter garden (for example a garden pavilion) is a separate building, and floor-area limits apply to it.<\/p>\n

Winter garden attached to a private house: the 33% rule<\/h2>\n

Annex 1 of the Building Code sets out the following for private houses (register codes 11100 and 11210):<\/p>\n\n\n\n\n\n\n
House<\/th>\nExtension up to 33%<\/strong><\/th>\nExtension over 33%<\/strong><\/th>\n<\/tr>\n<\/thead>\n
Typical private house: footprint over 60 m\u00b2 or house over 5 m high<\/td>\nBuilding notice and building design<\/td>\nBuilding permit<\/td>\n<\/tr>\n
Small house: footprint 20\u201360 m\u00b2 and up to 5 m high<\/td>\nBuilding notice<\/td>\nBuilding notice and building design<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The 33% is calculated by volume<\/strong> \u2014 the law refers to an extension \u201cby more than 33 per cent of its originally planned volume\u201d (Building Code \u00a7 26(2)).<\/p>\n

After construction, a notice of use<\/strong> is submitted for the extension of a private house; a use permit is not required (Building Code Annex 2).<\/p>\n

Note: the rules are stricter for apartment buildings and non-residential buildings.<\/strong> If the footprint of the building exceeds 60 m\u00b2, even an extension of up to 33% requires a building permit. This article covers private houses.<\/p>\n

Calculation example<\/h3>\n

Take a typical private house and a winter garden built onto it:<\/p>\n\n\n\n\n\n\n\n
<\/th>\nFloor area<\/th>\nHeight<\/th>\nVolume<\/th>\n<\/tr>\n<\/thead>\n
House<\/strong><\/td>\nfootprint 150 m\u00b2<\/td>\naverage ~6.5 m (including the roof space)<\/td>\n975 m\u00b3<\/strong> (from the construction register)<\/td>\n<\/tr>\n
Winter garden<\/strong><\/td>\n4 m \u00d7 7 m = 28 m\u00b2<\/strong><\/td>\naverage 3.2 m (3.6 m at the wall, 2.8 m at the outer edge)<\/td>\n28 \u00d7 3.2 = 89.6 m\u00b3<\/strong><\/td>\n<\/tr>\n
Extension<\/strong><\/td>\n<\/td>\n<\/td>\n89.6 \/ 975 = 9.2%<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

9.2% is well below the 33% limit \u2014 a building notice and a building design are enough.<\/p>\n

How large a winter garden would still fit?<\/strong> 33% of the house volume is 975 \u00d7 0.33 \u2248 322 m\u00b3. With the same average height of 3.2 m, that is about 100 m\u00b2<\/strong> \u2014 a typical winter garden is far below that.<\/p>\n

To calculate the volume of the winter garden, multiply the floor area by the average height. With a sloping roof, the average height is the mean of the height at the wall and at the outer edge. You can find the volume of your house in the Estonian Register of Construction Works (ehr.ee<\/a>) under the building data.<\/p>\n

Free-standing winter garden: the 20 m\u00b2 and 60 m\u00b2 limits<\/h2>\n

If the winter garden is not attached to the house, it is a separate building (Annex 1, ancillary building of a private house):<\/p>\n\n\n\n\n\n\n\n
Footprint and height of the winter garden<\/th>\nWhat you need<\/th>\n<\/tr>\n<\/thead>\n
Up to 20 m\u00b2 and up to 5 m high<\/td>\nNo notice or permit required<\/td>\n<\/tr>\n
20\u201360 m\u00b2 and up to 5 m high<\/td>\nBuilding notice and building design<\/td>\n<\/tr>\n
Over 60 m\u00b2 or over 5 m high<\/td>\nBuilding permit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Even where no notice or permit is required, the building must meet construction requirements and the local plan.<\/p>\n

Legalising a winter garden step by step<\/h2>\n
    \n
  1. House data from the construction register.<\/strong> Check that the house is recorded correctly (volume, footprint, earlier extensions). If earlier buildings have not been legalised, this must be done first \u2014 it will delay the schedule.<\/li>\n
  2. Original drawings.<\/strong> If the house has DWG drawings or drawings in good condition, they can be used and the design is faster and cheaper.<\/li>\n
  3. Topographic survey (geodetic base plan).<\/strong> The building design is prepared on a geodetic base plan. If one has not been made for the house before, it must be ordered \u2014 allow 2\u20133 weeks. Whether an existing survey can be used depends on its age and the requirements of the municipality. Since 1 January 2018 Estonia has used a new height system (EH2000), so a survey made before then cannot be used as the basis for a new design. We will review your documents and tell you whether a new survey is needed.<\/li>\n
  4. Building design.<\/strong> The design is prepared by a qualified designer.<\/li>\n
  5. Building notice in the construction register.<\/strong> The notice is submitted together with the design via the construction register. During the procedure the municipality may ask for corrections or photos.<\/li>\n
  6. Construction and construction log.<\/strong> A construction log is kept for the works.<\/li>\n
  7. Notice of use.<\/strong> After completion a notice of use is submitted and the winter garden is registered as part of the house.<\/li>\n<\/ol>\n

    How much does legalisation cost and how long does it take?<\/h2>\n

    Approximately \u20ac500\u20131,800<\/strong>, depending on which documents already exist:<\/p>\n