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<div class="logo"><a href="en/home.php"><img alt="best architects" src="lib/global/logo_26.png"></a></div></header><main><section class="winner"><!--<?php $filter->echoPrevNext(); ?>--><ba-slideshow class="slideshow full"><figure class="full first type-fill" style="--slide-color: #ffffff" data-color="#ffffff"><picture><source type="image/webp" srcset="lib/Gewinner/2026/UR/R9016_k.jpg.tf800x600-49x23.webp 800w, lib/Gewinner/2026/UR/R9016_k.jpg.tf1200x900-49x23.webp 1200w, lib/Gewinner/2026/UR/R9016_k.jpg.tf1600x1200-49x23.webp 1600w, lib/Gewinner/2026/UR/R9016_k.jpg.tf1900x1425-49x23.webp 1900w, lib/Gewinner/2026/UR/R9016_k.jpg.tf2000x1200-49x23.webp 2000w, lib/Gewinner/2026/UR/R9016_k.jpg.tf2375x1425-49x23.webp 2375w"></source><source type="image/jpeg" srcset="lib/Gewinner/2026/UR/R9016_k.jpg.tf800x600-49x23.jpg 800w, lib/Gewinner/2026/UR/R9016_k.jpg.tf1200x900-49x23.jpg 1200w, lib/Gewinner/2026/UR/R9016_k.jpg.tf1600x1200-49x23.jpg 1600w, lib/Gewinner/2026/UR/R9016_k.jpg.tf1900x1425-49x23.jpg 1900w, lib/Gewinner/2026/UR/R9016_k.jpg.tf2000x1200-49x23.jpg 2000w, lib/Gewinner/2026/UR/R9016_k.jpg.tf2375x1425-49x23.jpg 2375w"></source><img src="lib/Gewinner/2026/UR/R9016_k.jpg.tf800x600-49x23.jpg" alt="SAG Architektur: Renovation and modernisation of apartment house with courtyard building - best architects 26" sizes="100vw" style="object-position: 49% 23%" title="© SAG Architektur · Photo Michael Fritschi"></picture></figure></ba-slideshow><hgroup><h1>SAG Architektur</h1>
<h2>Renovation and modernisation of apartment house with courtyard building</h2></hgroup><div class="details">
<div class="detail">
<h3>best architects 26</h3>
<p>renovation and addition</p>
</div>
<div class="detail">
<h3>Place</h3>
<p>Basel, Switzerland</p>
</div>
<div class="detail">
<h3>Studio</h3>
<p><a href="https://sagarchitektur.ch" target="_blank">www.sagarchitektur.ch</a></p>
</div>
<div class="detail">
<h3>Photos</h3>
<p>Michael Fritschi</p>
</div>
</div>
<div class="description">
<h3>Description</h3>
<p>The property at Sperrstrasse 91 in Basel is part of a
perimeter block and consists of a front and a rear building. The rear building
is accessed via an open passageway in the front building, which dates back to
1956. There are 12 renovated apartments in the front building, which have new
kitchens and bathrooms. The roof was renovated to make it more energy-efficient
and fitted with a PV system, and the attic was converted into living space. The
existing balconies on the courtyard side were enlarged. The rear building was
previously used for a small commercial workshop and has now been subdivided
into tiny houses, taking the narrow courtyard situation into account. The four
identical units each extend over two floors. The project reuse materials from other properties, for example kitchen units from former school kitchens and trapezoidal sheeting as new cladding for the rear building.<br></p>
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